Config - access Perl configuration information
use Config;
if ($Config{'cc'} =~ /gcc/) {
print "built by gcc\n";
}
use Config qw(myconfig config_sh config_vars);
print myconfig();
print config_sh();
config_vars(qw(osname archname));
The Config module contains all the information that was available to the Configure program at Perl build time (over 900 values).
Shell variables from the config.sh file (written by Configure) are stored in the readonly-variable %Config, indexed by their names.
Values stored in config.sh as 'undef' are returned as undefined values. The perl exists function can be used to check if a named variable exists.
-V in Switches.
name='value';
Names which are unknown are output as name='UNKNOWN';. See also -V:name in Switches.
Here's a more sophisticated example of using %Config:
use Config;
use strict;
my %sig_num;
my @sig_name;
unless($Config{sig_name} && $Config{sig_num}) {
die "No sigs?";
} else {
my @names = split ' ', $Config{sig_name};
@sig_num{@names} = split ' ', $Config{sig_num};
foreach (@names) {
$sig_name[$sig_num{$_}] ||= $_;
}
}
print "signal #17 = $sig_name[17]\n";
if ($sig_num{ALRM}) {
print "SIGALRM is $sig_num{ALRM}\n";
}
Because this information is not stored within the perl executable itself it is possible (but unlikely) that the information does not relate to the actual perl binary which is being used to access it.
The Config module is installed into the architecture and version specific library directory ($Config{installarchlib}) and it checks the perl version number when loaded.
The values stored in config.sh may be either single-quoted or
double-quoted. Double-quoted strings are handy for those cases where you
need to include escape sequences in the strings. To avoid runtime variable
interpolation, any $ and @ characters are replaced by \$ and
\@, respectively. This isn't foolproof, of course, so don't embed \$
or \@ in double-quoted strings unless you're willing to deal with the
consequences. (The slashes will end up escaped and the $ or @ will trigger variable interpolation)
Most Config variables are determined by the Configure script on platforms supported by it (which is most
UNIX platforms). Some platforms have custom-made Config variables, and may thus not have some of the variables described below, or
may have extraneous variables specific to that particular port. See the
port specific documentation in such cases.
This variable is be used internally by Configure to determine the full
pathname (if any) of the Mcc program. After Configure runs, the value is
reset to a plain Mcc and is not useful.
This variable defines the extension used for ordinary libraries. For unix, it is .a. The . is included. Other possible values include .lib.
This variable defines the extension used for executable files. For unix it is empty. Other possible values include .exe.
This variable defines the extension used for object files. For unix, it is .o. The . is included. Other possible values include .obj.
This variable is set to true if AFS (Andrew File System) is used on the system, false otherwise. It is possible to override this with a hint value or command
line option, but you'd better know what you are doing.
This variable holds the number of bytes required to align a double. Usual values are 2, 4 and 8.
This variable is set if the user needs to run ansi2knr. Currently, this is not supported, so we just abort.
Thie variable contains the command which can be used to compute the host name. The command is fully qualified by its absolute path, to make it safe when used by a process with super-user privileges.
This is a number which identifies the lowest version of perl to have an API (for XS extensions) compatible with the present version. For example, for 5.005_01,
the apiversion should be 5.005, since 5.005_01 should be binary compatible
with 5.005. This should probably be incremented manually somehow, perhaps
from patchlevel.h. For now, we'll guess maintenance subversions will retain binary
compatibility.
This variable is be used internally by Configure to determine the full
pathname (if any) of the ar program. After Configure runs, the value is
reset to a plain ar and is not useful.
This variable holds the name of the directory in which the user wants to put architecture-dependent public library files for $package. It is most often a local directory such as /usr/local/lib. Programs using this variable must be prepared to deal with filename expansion.
This variable is the same as the archlib variable, but is filename expanded at configuration time, for convenient use.
This variable is a short name to characterize the current architecture. It is used mainly to construct the default archlib.
This variable defines any additional objects that must be linked in with the program on this architecture. On unix, it is usually empty. It is typically used to include emulations of unix calls or other facilities. For perl on OS/2, for example, this would include os2/os2.obj.
This variable is be used internally by Configure to determine the full
pathname (if any) of the awk program. After Configure runs, the value is
reset to a plain awk and is not useful.
The base revision level of this package, from the .package file.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable holds the name of the directory in which the user wants to put publicly executable images for the package in question. It is most often a local directory such as /usr/local/bin. Programs using this variable must be prepared to deal with ~name substitution.
This is the same as the bin variable, but is filename expanded at configuration time, for use in your makefiles.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the byacc program. After Configure runs, the value is
reset to a plain byacc and is not useful.
This variable holds the byte order. In the following, larger digits indicate more significance. The variable byteorder is either 4321 on a big-endian machine, or 1234 on a little-endian, or 87654321 on a Cray ... or 3412 with weird order !
This variable contains the \c string if that is what causes the echo command to suppress newline. Otherwise it is null. Correct usage is
$echo $n "prompt for a question: $c".
This variable contains a flag that precise difficulties the compiler has casting odd floating values to unsigned long:
0 = ok
1 = couldn't cast < 0
2 = couldn't cast >= 0x80000000
4 = couldn't cast in argument expression list
This variable is be used internally by Configure to determine the full
pathname (if any) of the cat program. After Configure runs, the value is
reset to a plain cat and is not useful.
This variable holds the name of a command to execute a
C compiler which can resolve multiple global
references that happen to have the same name. Usual values are cc, Mcc, cc -M, and gcc.
This variable contains any special flags that might need to be passed with cc -c to compile modules to be used to create a shared library that will be used
for dynamic loading. For hpux, this should be +z. It is up to the makefile
to use it.
This variable contains any special flags that might need to be passed to cc to link with a shared library for dynamic loading. It is up to the makefile to use it. For sunos 4.1, it should be empty.
This variable contains any additional C compiler flags desired by the user. It is up to the Makefile to use this.
Login name of the person who ran the Configure script and answered the questions. This is used to tag both config.sh and config_h.SH.
Electronic mail address of the person who ran Configure. This can be used by units that require the user's e-mail, like MailList.U.
Holds the output of the date command when the configuration file was produced. This is used to tag both config.sh and config_h.SH.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable holds the type returned by
times(). It can be long, or
clock_t on BSD sites (in which case <sys/types.h> should be included).
This variable is be used internally by Configure to determine the full
pathname (if any) of the comm program. After Configure runs, the value is
reset to a plain comm and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable holds the command to do a grep with a proper return status. On most sane systems it is simply grep. On insane systems it is a grep followed by a cat followed by a test. This variable is primarily for the use of other Configure units.
This variable is be used internally by Configure to determine the full
pathname (if any) of the cp program. After Configure runs, the value is
reset to a plain cp and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the cpp program. After Configure runs, the value is
reset to a plain cpp and is not useful.
This variable contains an identification of the catenation mechanism used by the C preprocessor.
This variable holds the flags that will be passed to the C pre- processor. It is up to the Makefile to use it.
This variable has the same functionality as cppminus, only it applies to cpprun and not cppstdin.
This variable contains the second part of the string which will invoke the
C preprocessor on the standard input and produce to
standard output. This variable will have the value - if cppstdin needs a minus to specify standard input, otherwise the value is
``''.
This variable contains the command which will invoke a C preprocessor on standard input and put the output to stdout. It is guaranteed not to be a wrapper and may be a null string if no preprocessor can be made directly available. This preprocessor might be different from the one used by the C compiler. Don't forget to append cpplast after the preprocessor options.
This variable contains the command which will invoke the C preprocessor on standard input and put the output to stdout. It is primarily used by other Configure units that ask about preprocessor symbols.
This variable holds -lcrypt or the path to a libcrypt.a archive if the
crypt() function is not defined in the standard
C library. It is up to the Makefile to use this.
This variable is be used internally by Configure to determine the full
pathname (if any) of the csh program. After Configure runs, the value is
reset to a plain csh and is not useful.
This variable holds what Gconvert is defined as to convert floating point
numbers into strings. It could be gconvert
or a more complex macro emulating gconvert with
gcvt() or sprintf.
This variable conditionally defines HAS_ACCESS if the
access() system call is
available to check for access permissions using real IDs.
This variable conditionally defines the HAS_ALARM symbol, which indicates to the
C program that the
alarm() routine is available.
This variable conditionally defines ARCHLIB to hold the pathname of architecture-dependent library files for $package.
If $archlib is the same as $privlib, then this is set to
undef.
This variable conditionally defines HASATTRIBUTE, which indicates the
C compiler can check for function attributes, such as
printf formats.
This variable conditionally defines the HAS_BCMP symbol if the
bcmp() routine is available to
compare strings.
This variable conditionally defines the HAS_BCOPY symbol if the
bcopy() routine is available
to copy strings.
This symbol conditionally defines the symbol BSD when running on a
BSD system.
This variable conditionally defines USE_BSD_GETPGRP if getpgrp needs one arguments whereas USG one needs none.
This variable conditionally defines USE_BSD_SETPGRP if setpgrp needs two arguments whereas USG one needs none. See also d_setpgid for a POSIX interface.
This variable conditionally defines the HAS_BZERO symbol if the
bzero() routine is available
to set memory to 0.
This variable conditionally defines CASTI32, which indicates whether the C compiler can cast large floats to 32-bit ints.
This variable conditionally defines CASTNEG, which indicates wether the
C compiler can cast negative float to unsigned.
This variable conditionally defines CHARVSPRINTF if this system has vsprintf returning type (char*). The trend seems to be to declare it as ``int
vsprintf()''.
This variable conditionally defines the HAS_CHOWN symbol, which indicates to the
C program that the
chown() routine is available.
This variable conditionally defines the HAS_CHROOT symbol, which indicates to the
C program that the
chroot() routine is available.
This variable conditionally defines the CHSIZE symbol, which indicates to the
C program that the
chsize() routine is available to truncate files. You might need a -lx to get this routine.
This variable conditionally defines HAS_CLOSEDIR if
closedir() is available.
This variable conditionally defines the HASCONST symbol, which indicates to the
C program that this
C compiler knows about the const type.
This variable conditionally defines the CRYPT symbol, which indicates to the
C program that the
crypt() routine is available to encrypt passwords and the like.
This variable conditionally defines the CSH symbol, which indicates to the
C program that the C-shell exists.
This variable conditionally defines the HAS_CUSERID symbol, which indicates to the
C program that the
cuserid() routine is available to get character login names.
This variable conditionally defines d_dbl_dig if this system's header files
provide DBL_DIG, which is the number of significant digits in a double precision number.
This variable conditionally defines the HAS_DIFFTIME symbol, which indicates to the
C program that the
difftime() routine is available.
This variable conditionally defines DIRNAMLEN, which indicates to the
C program that the length of directory entry names is
provided by a d_namelen field.
This variable conditionally defines the HAS_DLERROR symbol, which indicates to the
C program that the
dlerror() routine is available.
This variable conditionally defines the HAS_DLOPEN symbol, which indicates to the
C program that the
dlopen() routine is available.
This variable conditionally defines DLSYM_NEEDS_UNDERSCORE, which indicates that we need to prepend an underscore to the symbol name before calling
dlsym().
This variable conditionally defines the symbol DOSUID, which tells the
C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.
This variable conditionally defines
HAS_DUP2 if
dup2() is available to duplicate file descriptors.
This variable conditionally defines the HAS_ENDGRENT symbol, which indicates to the
C program that the
endgrent() routine is available for sequential access of the group database.
This variable conditionally defines HAS_ENDHOSTENT if
endhostent() is available
to close whatever was being used for host queries.
This variable conditionally defines HAS_ENDNETENT if
endnetent() is available
to close whatever was being used for network queries.
This variable conditionally defines HAS_ENDPROTOENT if
endprotoent() is
available to close whatever was being used for protocol queries.
This variable conditionally defines the HAS_ENDPWENT symbol, which indicates to the
C program that the
endpwent() routine is available for sequential access of the passwd database.
This variable conditionally defines HAS_ENDSERVENT if
endservent() is available
to close whatever was being used for service queries.
This variable conditionally defines EOF_NONBLOCK if EOF can be seen when reading from a non-blocking I/O source.
This variable conditionally defines the symbols EUNICE and VAX, which alerts the
C program that it must deal with ideosyncracies of VMS.
This variable conditionally defines the HAS_FCHMOD symbol, which indicates to the
C program that the
fchmod() routine is available to change mode of opened files.
This variable conditionally defines the HAS_FCHOWN symbol, which indicates to the
C program that the
fchown() routine is available to change ownership of opened files.
This variable conditionally defines the HAS_FCNTL symbol, and indicates whether the
fcntl() function exists
This variable contains the eventual value of the HAS_FD_MACROS symbol, which indicates if your
C compiler knows about the macros which manipulate an
fd_set.
This variable contains the eventual value of the HAS_FD_SET symbol, which indicates if your
C compiler knows about the fd_set typedef.
This variable contains the eventual value of the HAS_FDS_BITS symbol, which indicates if your fd_set typedef contains the fds_bits
member. If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate an
fd_set, HAS_FDS_BITS will let us know how to fix the gaffe.
This variable conditionally defines HAS_FGETPOS if
fgetpos() is available to
get the file position indicator.
This variable conditionally defines the FLEXFILENAMES symbol, which indicates that the system supports filenames longer than 14
characters.
This variable conditionally defines HAS_FLOCK if
flock() is available to do
file locking.
This variable conditionally defines the HAS_FORK symbol, which indicates to the
C program that the
fork() routine is available.
This variable conditionally defines the HAS_FPATHCONF symbol, which indicates to the
C program that the
pathconf() routine is available to determine file-system related limits and options associated with a given open file descriptor.
This variable conditionally defines HAS_FSETPOS if
fsetpos() is available to
set the file position indicator.
This variable conditionally defines the HAS_FTIME symbol, which indicates that the
ftime() routine exists. The
ftime() routine is basically a sub-second accuracy clock.
This variable conditionally defines the HAS_GETGRENT symbol, which indicates to the
C program that the
getgrent() routine is available for sequential access of the group database.
This variable conditionally defines the HAS_GETGROUPS symbol, which indicates to the
C program that the
getgroups() routine is available to get the list of process groups.
This variable conditionally defines the HAS_GETHOSTBYADDR symbol, which indicates to the
C program that the
gethostbyaddr() routine is available to look up hosts by their
IP addresses.
This variable conditionally defines the HAS_GETHOSTBYNAME symbol, which indicates to the
C program that the
gethostbyname() routine is available to look up host names in some data base or other.
This variable conditionally defines HAS_GETHOSTENT if
gethostent() is available
to look up host names in some data base or another.
This variable conditionally defines the HAS_GETHOSTNAME symbol, which indicates to the
C program that the
gethostname() routine may be used to derive the host name.
This variable conditionally defines the HAS_GETHOST_PROTOS symbol, which indicates to the
C program that <netdb.h> supplies prototypes for the various gethost*() functions. See
also netdbtype.U for probing for various netdb types.
This variable conditionally defines the HAS_GETLOGIN symbol, which indicates to the
C program that the
getlogin() routine is available to get the login name.
This variable conditionally defines the HAS_GETNETBYADDR symbol, which indicates to the
C program that the
getnetbyaddr() routine is available to look up networks by their
IP addresses.
This variable conditionally defines the HAS_GETNETBYNAME symbol, which indicates to the
C program that the
getnetbyname() routine is available to look up networks by their names.
This variable conditionally defines HAS_GETNETENT if
getnetent() is available
to look up network names in some data base or another.
This variable conditionally defines the HAS_GETNET_PROTOS symbol, which indicates to the
C program that <netdb.h> supplies prototypes for the various getnet*() functions. See
also netdbtype.U for probing for various netdb types.
This variable conditionally defines the HAS_GETPROTOBYNAME
symbol, which indicates to the
C program that the
getprotobyname() routine is available to look up protocols by their name.
This variable conditionally defines the HAS_GETPROTOBYNUMBER
symbol, which indicates to the
C program that the
getprotobynumber() routine is available to look up protocols by their number.
This variable conditionally defines HAS_GETPROTOENT if
getprotoent() is
available to look up protocols in some data base or another.
This variable conditionally defines the HAS_GETPGID symbol, which indicates to the
C program that the
getpgid(pid) function is available to get the process group id.
This variable conditionally defines the
HAS_GETPGRP2 symbol, which indicates to the
C program that the
getpgrp2() (as in
DG/UX) routine is available to get the current process group.
This variable conditionally defines HAS_GETPGRP if
getpgrp() is available to
get the current process group.
This variable conditionally defines the HAS_GETPPID symbol, which indicates to the
C program that the
getppid() routine is available to get the parent process
ID.
This variable conditionally defines HAS_GETPRIORITY if
getpriority() is
available to get a process's priority.
This variable conditionally defines the HAS_GETPROTO_PROTOS symbol, which indicates to the
C program that <netdb.h> supplies prototypes for the various getproto*() functions. See
also netdbtype.U for probing for various netdb types.
This variable conditionally defines the HAS_GETPWENT symbol, which indicates to the
C program that the
getpwent() routine is available for sequential access of the passwd database.
This variable conditionally defines the HAS_GETSERVBYNAME
symbol, which indicates to the
C program that the
getservbyname() routine is available to look up services by their name.
This variable conditionally defines the HAS_GETSERVBYPORT
symbol, which indicates to the
C program that the
getservbyport() routine is available to look up services by their port.
This variable conditionally defines HAS_GETSERVENT if
getservent() is available
to look up network services in some data base or another.
This variable conditionally defines the HAS_GETSERV_PROTOS symbol, which indicates to the
C program that <netdb.h> supplies prototypes for the various getserv*() functions. See
also netdbtype.U for probing for various netdb types.
This variable conditionally defines the HAS_GETTIMEOFDAY symbol, which indicates that the
gettimeofday() system
call exists (to obtain a sub-second accuracy clock). You should probably
include <sys/resource.h>.
Defined if we're dealing with the GNU
C Library.
This variable conditionally defines GRPASSWD, which indicates that struct group in <grp.h> contains gr_passwd.
This variable conditionally defines HAS_HTONL if
htonl() and its friends are
available to do network order byte swapping.
This variable conditionally defines HAS_INDEX if
index() and
rindex() are available for string searching.
This variable conditionally defines the HAS_INET_ATON symbol, which indicates to the
C program that the
inet_aton() function is available to parse
IP address dotted-quad strings.
This variable conditionally defines the HAS_ISASCII constant, which indicates to the
C program that
isascii() is available.
This variable conditionally defines the HAS_KILLPG symbol, which indicates to the
C program that the
killpg() routine is available to kill process groups.
This variable conditionally defines the HAS_LCHOWN symbol, which indicates to the
C program that the
lchown() routine is available to operate on a symbolic link (instead of following the link).
This variable conditionally defines HAS_LINK if
link() is available to create
hard links.
This variable conditionally defines HAS_LOCALECONV if
localeconv() is available
for numeric and monetary formatting conventions.
This variable conditionally defines HAS_LOCKF if
lockf() is available to do
file locking.
This variable conditionally defines HAS_LONG_DOUBLE if the long double type is supported.
This variable conditionally defines HAS_LONG_LONG if the long long type is supported.
This variable conditionally defines HAS_LSTAT if
lstat() is available to do
file stats on symbolic links.
This variable conditionally defines the HAS_MBLEN symbol, which indicates to the
C program that the
mblen() routine is available to find the number of bytes in a multibye character.
This variable conditionally defines the HAS_MBSTOWCS symbol, which indicates to the
C program that the
mbstowcs() routine is available to convert a multibyte string into a wide character string.
This variable conditionally defines the HAS_MBTOWC symbol, which indicates to the
C program that the
mbtowc() routine is available to convert multibyte to a wide character.
This variable conditionally defines the HAS_MEMCMP symbol, which indicates to the
C program that the
memcmp() routine is available to compare blocks of memory.
This variable conditionally defines the HAS_MEMCPY symbol, which indicates to the
C program that the
memcpy() routine is available to copy blocks of memory.
This variable conditionally defines the HAS_MEMMOVE symbol, which indicates to the
C program that the
memmove() routine is available to copy potentatially overlapping blocks of memory.
This variable conditionally defines the HAS_MEMSET symbol, which indicates to the
C program that the
memset() routine is available to set blocks of memory.
This variable conditionally defines the HAS_MKDIR symbol, which indicates to the
C program that the
mkdir() routine is available to create
directories..
This variable conditionally defines the HAS_MKFIFO symbol, which indicates to the
C program that the
mkfifo() routine is available.
This variable conditionally defines the HAS_MKTIME symbol, which indicates to the
C program that the
mktime() routine is available.
This variable conditionally defines the HAS_MSG symbol, which indicates that the entire msg*(2) library is present.
This variable conditionally defines the HAS_MSGCTL symbol, which indicates to the
C program that the
msgctl() routine is available.
This variable conditionally defines the HAS_MSGGET symbol, which indicates to the
C program that the
msgget() routine is available.
This variable conditionally defines the HAS_MSGRCV symbol, which indicates to the
C program that the
msgrcv() routine is available.
This variable conditionally defines the HAS_MSGSND symbol, which indicates to the
C program that the
msgsnd() routine is available.
This variable conditionally defines MYMALLOC in case other parts of the source want to take special action if MYMALLOC is used. This may include different sorts of profiling or error detection.
This variable conditionally defines the HAS_NICE symbol, which indicates to the
C program that the
nice() routine is available.
This variable conditionally defines the OLD_PTHREADS_API symbol, and indicates that Perl should be built to use the old draft POSIX threads API. This is only potneially meaningful if usethreads is set.
This variable conditionally defines the OLDSOCKET symbol, which indicates that the BSD socket interface is based on 4.1c and not 4.2.
This variable conditionally defines the
HAS_OPEN3 manifest constant, which indicates to the
C program that the 3 argument version of the
open(2) function is available.
This variable conditionally defines the HAS_PATHCONF symbol, which indicates to the
C program that the
pathconf() routine is available to determine file-system related limits and options associated with a given filename.
This variable conditionally defines the HAS_PAUSE symbol, which indicates to the
C program that the
pause() routine is available to suspend a process until a signal is received.
This variable conditionally defines the PHOSTNAME symbol, which contains the shell command which, when fed to
popen(), may be used to derive
the host name.
This variable conditionally defines the HAS_PIPE symbol, which indicates to the
C program that the
pipe() routine is available to create an inter-process channel.
This variable conditionally defines the HAS_POLL symbol, which indicates to the
C program that the
poll() routine is available to poll active file descriptors.
This variable conditionally defines the PORTABLE symbol, which indicates to the
C program that it should not assume that it is running
on the machine it was compiled on.
This variable conditionally defines the HAS_PTHREAD_YIELD
symbol if the pthread_yield routine is available to yield the execution of
the current thread.
This variable conditionally defines the PTHREADS_CREATED_JOINABLE
symbol if pthreads are created in the joinable (aka undetached) state.
This variable conditionally defines PWAGE, which indicates that struct passwd contains pw_age.
This variable conditionally defines PWCHANGE, which indicates that struct passwd contains pw_change.
This variable conditionally defines PWCLASS, which indicates that struct passwd contains pw_class.
This variable conditionally defines PWCOMMENT, which indicates that struct passwd contains pw_comment.
This variable conditionally defines PWEXPIRE, which indicates that struct passwd contains pw_expire.
This variable conditionally defines PWGECOS, which indicates that struct passwd contains pw_gecos.
This variable conditionally defines PWPASSWD, which indicates that struct passwd contains pw_passwd.
This variable conditionally defines PWQUOTA, which indicates that struct passwd contains pw_quota.
This variable conditionally defines HAS_READDIR if
readdir() is available to
read directory entries.
This variable conditionally defines the HAS_READLINK symbol, which indicates to the
C program that the
readlink() routine is available to read the value of a symbolic link.
This variable conditionally defines the HAS_RENAME symbol, which indicates to the
C program that the
rename() routine is available to rename files.
This variable conditionally defines HAS_REWINDDIR if
rewinddir() is available.
This variable conditionally defines HAS_RMDIR if
rmdir() is available to remove
directories.
This variable conditionally defines the HAS_SAFE_BCOPY symbol if the
bcopy() routine can do
overlapping copies.
This variable conditionally defines the HAS_SAFE_MEMCPY symbol if the
memcpy() routine can do
overlapping copies.
This variable conditionally defines the HAS_SANE_MEMCMP symbol if the
memcpy() routine is available
and can be used to compare relative magnitudes of chars with their high
bits set.
This variable conditionally defines the HAS_SCHED_YIELD
symbol if the sched_yield routine is available to yield the execution of
the current thread.
This variable conditionally defines HAS_SEEKDIR if
seekdir() is available.
This variable conditionally defines HAS_SELECT if
select() is available to select active file descriptors.
A <sys/time.h> inclusion may be necessary for the timeout field.
This variable conditionally defines the HAS_SEM symbol, which indicates that the entire sem*(2) library is present.
This variable conditionally defines the HAS_SEMCTL symbol, which indicates to the
C program that the
semctl() routine is available.
This variable conditionally defines USE_SEMCTL_SEMID_DS, which indicates that struct semid_ds * is to be used for semctl IPC_STAT.
This variable conditionally defines USE_SEMCTL_SEMUN, which indicates that union semun is to be used for semctl IPC_STAT.
This variable conditionally defines the HAS_SEMGET symbol, which indicates to the
C program that the
semget() routine is available.
This variable conditionally defines the HAS_SEMOP symbol, which indicates to the
C program that the
semop() routine is available.
This variable conditionally defines the HAS_SETEGID symbol, which indicates to the
C program that the
setegid() routine is available to change the effective gid of the current program.
This variable conditionally defines the HAS_SETEUID symbol, which indicates to the
C program that the
seteuid() routine is available to change the effective uid of the current program.
This variable conditionally defines the HAS_SETGRENT symbol, which indicates to the
C program that the
setgrent() routine is available for initializing sequential access to the group database.
This variable conditionally defines the HAS_SETGROUPS symbol, which indicates to the
C program that the
setgroups() routine is available to set the list of process groups.
This variable conditionally defines HAS_SETHOSTENT if
sethostent() is
available.
This variable conditionally defines the HAS_SETLINEBUF symbol, which indicates to the
C program that the
setlinebuf() routine is available to change stderr or stdout from block-buffered or unbuffered to a line-buffered mode.
This variable conditionally defines HAS_SETLOCALE if
setlocale() is available
to handle locale-specific ctype implementations.
This variable conditionally defines HAS_SETNETENT if
setnetent() is available.
This variable conditionally defines HAS_SETPROTOENT if
setprotoent() is
available.
This variable conditionally defines the HAS_SETPGID symbol if the
setpgid(pid, gpid)
function is available to set process group ID.
This variable conditionally defines the
HAS_SETPGRP2 symbol, which indicates to the
C program that the
setpgrp2() (as in
DG/UX) routine is available to set the current process group.
This variable conditionally defines HAS_SETPGRP if
setpgrp() is available to
set the current process group.
This variable conditionally defines HAS_SETPRIORITY if
setpriority() is
available to set a process's priority.
This variable conditionally defines the HAS_SETPWENT symbol, which indicates to the
C program that the
setpwent() routine is available for initializing sequential access to the passwd database.
This variable conditionally defines HAS_SETREGID if
setregid() is available to
change the real and effective gid of the current process.
This variable conditionally defines HAS_SETRESGID if
setresgid() is available
to change the real, effective and saved gid of the current process.
This variable conditionally defines HAS_SETREUID if
setresuid() is available
to change the real, effective and saved uid of the current process.
This variable conditionally defines HAS_SETREUID if
setreuid() is available to
change the real and effective uid of the current process.
This variable conditionally defines the HAS_SETRGID symbol, which indicates to the
C program that the
setrgid() routine is available to change the real gid of the current program.
This variable conditionally defines the HAS_SETRUID symbol, which indicates to the
C program that the
setruid() routine is available to change the real uid of the current program.
This variable conditionally defines HAS_SETSERVENT if
setservent() is
available.
This variable conditionally defines HAS_SETSID if
setsid() is available to set
the process group ID.
This variable conditionally defines the HAS_SETVBUF symbol, which indicates to the
C program that the
setvbuf() routine is available to change buffering on an open stdio stream.
This variable conditionally defines the USE_SFIO symbol, and indicates whether sfio is available (and should be used).
This variable conditionally defines the HAS_SHM symbol, which indicates that the entire shm*(2) library is present.
This variable conditionally defines the HAS_SHMAT symbol, which indicates to the
C program that the
shmat() routine is available.
This variable conditionally defines the HAS_SHMAT_PROTOTYPE
symbol, which indicates that sys/shm.h has a prototype for shmat.
This variable conditionally defines the HAS_SHMCTL symbol, which indicates to the
C program that the
shmctl() routine is available.
This variable conditionally defines the HAS_SHMDT symbol, which indicates to the
C program that the
shmdt() routine is available.
This variable conditionally defines the HAS_SHMGET symbol, which indicates to the
C program that the
shmget() routine is available.
This variable conditionally defines the HAS_SIGACTION symbol, which indicates that the Vr4
sigaction() routine is
available.
This variable conditionally defines the HAS_SIGSETJMP symbol, which indicates that the
sigsetjmp() routine is available to call
setjmp() and optionally save the process's signal mask.
This variable conditionally defines HAS_SOCKET, which indicates that the BSD socket interface is supported.
This variable conditionally defines the HAS_SOCKETPAIR symbol, which indicates that the BSD
socketpair() is
supported.
This variable conditionally defines USE_STAT_BLOCKS if this system has a stat structure declaring st_blksize and st_blocks.
This variable conditionally defines STDIO_CNT_LVALUE if the
FILE_cnt macro can be used as an lvalue.
This variable conditionally defines STDIO_PTR_LVALUE if the
FILE_ptr macro can be used as an lvalue.
This variable conditionally defines USE_STDIO_BASE if this system has a FILE structure declaring a usable _base field (or equivalent) in stdio.h.
This variable conditionally defines USE_STDIO_PTR if this system has a FILE structure declaring usable _ptr and _cnt fields (or equivalent) in stdio.h.
This variable conditionally defines HAS_STRCHR if
strchr() and
strrchr() are available for string searching.
This variable conditionally defines HAS_STRCOLL if
strcoll() is available to
compare strings using collating information.
This variable conditionally defines the USE_STRUCT_COPY symbol, which indicates to the
C program that this
C compiler knows how to copy structures.
This variable holds what Strerrr is defined as to translate an error code
condition into an error message string. It could be strerror
or a more complex macro emulating strrror with sys_errlist[], or the
unknown string when both strerror and sys_errlist are missing.
This variable conditionally defines HAS_STRERROR if
strerror() is available to
translate error numbers to strings.
This variable conditionally defines the HAS_STRTOD symbol, which indicates to the
C program that the
strtod() routine is available to provide better numeric string conversion than
atof().
This variable conditionally defines the HAS_STRTOL symbol, which indicates to the
C program that the
strtol() routine is available to provide better numeric string conversion than
atoi() and friends.
This variable conditionally defines the HAS_STRTOUL symbol, which indicates to the
C program that the
strtoul() routine is available to provide conversion of strings to unsigned long.
This variable conditionally defines HAS_STRXFRM if
strxfrm() is available to
transform strings.
This variable conditionally defines SETUID_SCRIPTS_ARE_SECURE_NOW
if setuid scripts can be secure. This test looks in /dev/fd/.
This variable conditionally defines the HAS_SYMLINK symbol, which indicates to the
C program that the
symlink() routine is available to create symbolic links.
This variable conditionally defines HAS_SYSCALL if
syscall() is available call
arbitrary system calls.
This variable conditionally defines the HAS_SYSCONF symbol, which indicates to the
C program that the
sysconf() routine is available to determine system related limits and options.
This variable conditionally defines HAS_SYS_ERRNOLIST if sys_errnolist[] is available to translate error numbers to the symbolic
name.
This variable conditionally defines HAS_SYS_ERRLIST if sys_errlist[] is available to translate error numbers to strings.
This variable conditionally defines HAS_SYSTEM if
system() is available to
issue a shell command.
This variable conditionally defines the HAS_TCGETPGRP symbol, which indicates to the
C program that the
tcgetpgrp() routine is available. to get foreground process group
ID.
This variable conditionally defines the HAS_TCSETPGRP symbol, which indicates to the
C program that the
tcsetpgrp() routine is available to set foreground process group
ID.
This variable conditionally defines HAS_TELLDIR if
telldir() is available.
This variable conditionally defines the HAS_TIME symbol, which indicates that the
time() routine exists. The
time() routine is normaly provided on
UNIX systems.
This variable conditionally defines the HAS_TIMES symbol, which indicates that the
times() routine exists. The
times() routine is normaly provided on
UNIX systems. You may have to include <sys/times.h>.
This variable conditionally defines HAS_TRUNCATE if
truncate() is available to
truncate files.
This variable conditionally defines HAS_TZNAME if tzname[] is available to access timezone names.
This variable conditionally defines the HAS_UMASK symbol, which indicates to the
C program that the
umask() routine is available. to set and get the value of the file creation mask.
This variable conditionally defines the HAS_UNAME symbol, which indicates to the
C program that the
uname() routine may be used to derive the host name.
This variable conditionally defines HAS_UNION_SEMUN if the union semun is defined by including <sys/sem.h>.
This variable conditionally defines the HAS_VFORK symbol, which indicates the
vfork() routine is available.
This variable conditionally defines VOID_CLOSEDIR if
closedir() does not return
a value.
This variable conditionally defines VOIDSIG if this system declares ``void (*signal(...))()'' in signal.h. The old way was to declare it as ``int (*signal(...))()''.
This variable conditionally defines USE_IOCNOTTY to indicate that the
ioctl() call with TIOCNOTTY should be used to void tty association. Otherwise (on USG probably), it is enough to close the standard file decriptors and do a
setpgrp().
This variable conditionally defines the HASVOLATILE symbol, which indicates to the
C program that this
C compiler knows about the volatile declaration.
This variable conditionally defines the HAS_VPRINTF symbol, which indicates to the
C program that the
vprintf() routine is available to printf with a pointer to an argument list.
This variable conditionally defines the
HAS_WAIT4 symbol, which indicates the
wait4() routine is available.
This variable conditionally defines HAS_WAITPID if
waitpid() is available to
wait for child process.
This variable conditionally defines the HAS_WCSTOMBS symbol, which indicates to the
C program that the
wcstombs() routine is available to convert wide character strings to multibyte strings.
This variable conditionally defines the HAS_WCTOMB symbol, which indicates to the
C program that the
wctomb() routine is available to convert a wide character to a multibyte.
This variable conditionally defines the symbol XENIX, which alerts the
C program that it runs under Xenix.
This variable is be used internally by Configure to determine the full
pathname (if any) of the date program. After Configure runs, the value is
reset to a plain date and is not useful.
This variable contains the type of the hash structure element in the <db.h> header file. In older versions of DB, it was int, while in newer ones it is u_int32_t.
This variable contains the type of the prefix structure element in the <db.h> header file. In older versions of DB, it was int, while in newer ones it is size_t.
This symbol is set to struct direct or struct dirent depending on whether dirent is available or not. You should use this pseudo
type to portably declare your directory entries.
This variable contains the extension that is to be used for the dynamically loaded modules that perl generaties.
This variable contains the name of the dynamic loading file that will be used with the package.
This variable contains the value of the DOUBLESIZE symbol, which indicates to the
C program how many bytes there are in a double.
This variable holds a list of XS extension files we want to link dynamically into the package. It is used by Makefile.
This variable bears the symbolic errno code set by
read() when no data is present
on the file and non-blocking I/O was enabled (otherwise,
read() blocks naturally).
This variable conditionally defines EBCDIC if this system uses EBCDIC encoding. Among other things, this means that the character ranges are not
contiguous. See trnl.U
This variable is be used internally by Configure to determine the full
pathname (if any) of the echo program. After Configure runs, the value is
reset to a plain echo and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the egrep program. After Configure runs, the value is
reset to a plain egrep and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
When running under Eunice this variable contains a command which will convert a shell script to the proper form of text file for it to be executable by the shell. On other systems it is a no-op.
This is an old synonym for _exe.
This variable is be used internally by Configure to determine the full
pathname (if any) of the expr program. After Configure runs, the value is
reset to a plain expr and is not useful.
This variable holds a list of all extension files (both XS and non-xs linked into the package. It is propagated to Config.pm and is typically used to test whether a particular extesion is available.
This variable is be used internally by Configure to determine the full
pathname (if any) of the find program. After Configure runs, the value is
reset to a plain find and is not useful.
This variable defines the first file searched by make. On unix, it is makefile (then Makefile). On case-insensitive systems, it might be something else. This is only used to deal with convoluted make depend tricks.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable defines Fpos_t to be something like fpost_t, long, uint, or whatever type is used to declare file positions in libc.
This variable contains the return type of
free(). It is usually void, but
occasionally int.
This variable contains the full pathname to csh, whether or not the user has specified portability. This is only used in the compiled
C program, and we assume that all systems which can
share this executable will have the same full pathname to
csh.
This variable contains the full pathname to sed, whether or not the user has specified portability. This is only used in the compiled
C program, and we assume that all systems which can
share this executable will have the same full pathname to
sed.
If GNU cc (gcc) is used, this variable holds 1 or 2 to indicate whether the compiler is version 1 or 2. This is used in setting
some of the default cflags. It is set to '' if not gcc.
This variable defines Gid_t to be something like gid_t, int, ushort, or whatever type is used to declare the return type of
getgid(). Typically, it is the type of group ids in the kernel.
This variable is be used internally by Configure to determine the full pathname (if any) of the grep program. After Configure runs, the value is reset to a plain grep and is not useful.
This variable contains a command that produces the text of the
/etc/group file. This is normally ``cat /etc/group'', but can be ``ypcat group'' when NIS is used.
This variable defines Groups_t to be something like gid_t, int, ushort, or whatever type is used for the second argument to
getgroups() and
setgroups(). Usually, this is the same as gidtype (gid_t), but sometimes it isn't.
This variable is be used internally by Configure to determine the full
pathname (if any) of the gzip program. After Configure runs, the value is
reset to a plain gzip and is not useful.
This is variable gets set in various places to tell i_fcntl that <fcntl.h> should be included.
This is variable gets set in various places to tell i_sys_file that <sys/file.h> should be included.
Gives the type of hints used for previous answers. May be one of
default, recommended or previous.
This variable contains a command that produces the text of the
/etc/hosts file. This is normally ``cat /etc/hosts'', but can be ``ypcat hosts'' when NIS is used.
This variable contains a flag which will tell the C compiler and loader to produce a program running with a huge memory model. If the huge model is not supported, contains the flag to produce large model programs. It is up to the Makefile to use this.
This variable conditionally defines the I_ARPA_INET symbol, and indicates whether a
C program should include <arpa/inet.h>.
This variable conditionally defines the I_SYS_BSDIOCTL symbol, which indicates to the
C program that <sys/bsdioctl.h> exists and
should be included.
This variable conditionally defines the I_DB symbol, and indicates whether a
C program may include Berkeley's DB include file <db.h>.
This variable conditionally defines the I_DBM symbol, which indicates to the
C program that <dbm.h> exists and should be
included.
This variable conditionally defines I_DIRENT, which indicates to the
C program that it should include <dirent.h>.
This variable conditionally defines the I_DLD symbol, which indicates to the
C program that <dld.h> (GNU dynamic loading) exists and should be included.
This variable conditionally defines the I_DLFCN symbol, which indicates to the
C program that <dlfcn.h> exists and should be
included.
This variable controls the value of I_FCNTL (which tells the
C program to include <fcntl.h>).
This variable conditionally defines the I_FLOAT symbol, and indicates whether a
C program may include <float.h> to get symbols like DBL_MAX
or DBL_MIN, i.e. machine dependent floating point values.
This variable conditionally defines the I_GDBM symbol, which indicates to the
C program that <gdbm.h> exists and should be
included.
This variable conditionally defines the I_GRP symbol, and indicates whether a
C program should include <grp.h>.
This variable conditionally defines the I_LIMITS symbol, and indicates whether a
C program may include <limits.h> to get symbols like WORD_BIT
and friends.
This variable conditionally defines the I_LOCALE symbol, and indicates whether a
C program should include <locale.h>.
This variable conditionally defines the I_MALLOC symbol, and indicates whether a
C program should include <malloc.h>.
This variable conditionally defines the I_MATH symbol, and indicates whether a
C program may include <math.h>.
This variable conditionally defines the I_MEMORY symbol, and indicates whether a
C program should include <memory.h>.
This variable conditionally defines the I_NDBM symbol, which indicates to the
C program that <ndbm.h> exists and should be
included.
This variable conditionally defines the I_NETDB symbol, and indicates whether a
C program should include <netdb.h>.
This variable conditionally defines the I_NET_ERRNO symbol, which indicates to the
C program that <net/errno.h> exists and should
be included.
This variable conditionally defines I_NETINET_IN, which indicates to the
C program that it should include <netinet/in.h>.
Otherwise, you may try <sys/in.h>.
This variable conditionally defines I_PWD, which indicates to the
C program that it should include <pwd.h>.
This variable conditionally defines the I_RPCSVC_DBM symbol, which indicates to the
C program that <rpcsvc/dbm.h> exists and should be included. Some System
V systems might need this instead of <dbm.h>.
This variable conditionally defines the I_SFIO symbol, and indicates whether a
C program should include <sfio.h>.
This variable conditionally defines the I_SGTTY symbol, which indicates to the
C program that it should include <sgtty.h>
rather than <termio.h>.
This variable conditionally defines the I_STDARG symbol, which indicates to the
C program that <stdarg.h> exists and should be
included.
This variable conditionally defines the I_STDDEF symbol, which indicates to the
C program that <stddef.h> exists and should be
included.
This variable conditionally defines the I_STDLIB symbol, which indicates to the
C program that <stdlib.h> exists and should be
included.
This variable conditionally defines the I_STRING symbol, which indicates that <string.h> should be included rather
than <strings.h>.
This variable conditionally defines the I_SYS_DIR symbol, and indicates whether a
C program should include <sys/dir.h>.
This variable conditionally defines the I_SYS_FILE symbol, and indicates whether a
C program should include <sys/file.h> to get R_OK and friends.
This variable conditionally defines the I_SYS_FILIO symbol, which indicates to the
C program that <sys/filio.h> exists and should
be included in preference to <sys/ioctl.h>.
This variable conditionally defines I_SYS_IN, which indicates to the
C program that it should include <sys/in.h>
instead of <netinet/in.h>.
This variable conditionally defines the I_SYS_IOCTL symbol, which indicates to the
C program that <sys/ioctl.h> exists and should
be included.
This variable conditionally defines the I_SYS_NDIR symbol, and indicates whether a
C program should include <sys/ndir.h>.
This variable conditionally defines the I_SYS_PARAM symbol, and indicates whether a
C program should include <sys/param.h>.
This variable conditionally defines the I_SYS_RESOURCE symbol, and indicates whether a
C program should include <sys/resource.h>.
This variable conditionally defines I_SYS_SELECT, which indicates to the
C program that it should include <sys/select.h>
in order to get the definition of struct timeval.
This variable conditionally defines I_SYS_SOCKIO to indicate to the
C program that socket ioctl codes may be found in
<sys/sockio.h> instead of <sys/ioctl.h>.
This variable conditionally defines the I_SYS_STAT symbol, and indicates whether a
C program should include <sys/stat.h>.
This variable conditionally defines I_SYS_TIME, which indicates to the
C program that it should include <sys/time.h>.
This variable conditionally defines I_SYS_TIME_KERNEL, which indicates to the
C program that it should include <sys/time.h> with KERNEL defined.
This variable conditionally defines the I_SYS_TIMES symbol, and indicates whether a
C program should include <sys/times.h>.
This variable conditionally defines the I_SYS_TYPES symbol, and indicates whether a
C program should include <sys/types.h>.
This variable conditionally defines I_SYS_UN, which indicates to the
C program that it should include <sys/un.h> to get UNIX
domain socket definitions.
This variable conditionally defines I_SYS_WAIT, which indicates to the
C program that it should include <sys/wait.h>.
This variable conditionally defines the I_TERMIO symbol, which indicates to the
C program that it should include <termio.h>
rather than <sgtty.h>.
This variable conditionally defines the I_TERMIOS symbol, which indicates to the
C program that the POSIX <termios.h> file is to be included.
This variable conditionally defines I_TIME, which indicates to the
C program that it should include <time.h>.
This variable conditionally defines the I_UNISTD symbol, and indicates whether a
C program should include <unistd.h>.
This variable conditionally defines the I_UTIME symbol, and indicates whether a
C program should include <utime.h>.
This variable conditionally defines the I_VALUES symbol, and indicates whether a
C program may include <values.h> to get symbols like MAXLONG
and friends.
This variable conditionally defines I_VARARGS, which indicates to the
C program that it should include <varargs.h>.
Contains the name of the header to be included to get va_dcl definition. Typically one of varargs.h or stdarg.h.
This variable conditionally defines the I_VFORK symbol, and indicates whether a
C program should include vfork.h.
This variable must preceed the normal include path to get hte right one, as in $incpath/usr/include or $incpath/usr/lib. Value can be ``'' or /bsd43 on mips.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is really the same as archlibexp but may differ on those
systems using AFS. For extra portability, only this variable should be used in makefiles.
This variable is the same as binexp unless AFS is running in which case the user is explicitely prompted for it. This
variable should always be used in your makefiles for maximum portability.
This variable is really the same as man1direxp, unless you are using
AFS in which case it points to the read/write location whereas man1direxp only points to the read-only access location.
For extra portability, you should only use this variable within your
makefiles.
This variable is really the same as man3direxp, unless you are using
AFS in which case it points to the read/write location whereas man3direxp only points to the read-only access location.
For extra portability, you should only use this variable within your
makefiles.
This variable is really the same as privlibexp but may differ on those
systems using AFS. For extra portability, only this variable should be used in makefiles.
This variable is usually the same as scriptdirexp, unless you are on a
system running AFS, in which case they may differ slightly. You should always use this
variable within your makefiles for portability.
This variable is really the same as sitearchexp but may differ on those
systems using AFS. For extra portability, only this variable should be used in makefiles.
This variable is really the same as sitelibexp but may differ on those
systems using AFS. For extra portability, only this variable should be used in makefiles.
This variable contains the value of the INTSIZE symbol, which indicates to the
C program how many bytes there are in an int.
This variable holds a list of all XS extensions included in the package.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains a flag which will tell the C compiler and loader to produce a program running with a large memory model. It is up to the Makefile to use this.
This variable indicates the program to be used to link libraries for
dynamic loading. On some systems, it is ld. On ELF systems, it should be $cc. Mostly, we'll try to respect the hint file
setting.
This variable contains any special flags that might need to be passed to
$ld to create a shared library suitable for dynamic loading.
It is up to the makefile to use it. For hpux, it should be -b. For sunos 4.1, it is empty.
This variable contains any additional C loader flags desired by the user. It is up to the Makefile to use this.
This variable is be used internally by Configure to determine the full
pathname (if any) of the less program. After Configure runs, the value is
reset to a plain less and is not useful.
This is an old synonym for _a.
This variable contains the location of the C library.
The perl executable is obtained by linking perlmain.c with libperl, any static extensions (usually just DynaLoader), and any other libraries needed on this system. libperl is usually libperl.a, but can also be libperl.so.xxx if the user wishes to build a perl executable with a shared library.
This variable holds the general path used to find libraries. It is intended to be used by other units.
This variable holds the additional libraries we want to use. It is up to the Makefile to deal with it.
This variable holds a list of all the libraries we want to search. The order is chosen to pick up the c library ahead of ucb or bsd libraries for SVR4.
This variable is be used internally by Configure to determine the full
pathname (if any) of the line program. After Configure runs, the value is
reset to a plain line and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains any additional C partial linker flags desired by the user. It is up to the Makefile to use this.
This variable is be used internally by Configure to determine the full
pathname (if any) of the ln program. After Configure runs, the value is
reset to a plain ln and is not useful.
This variable holds the name of the command to make symbolic links (if they
are supported). It can be used in the Makefile. It is either ln -s or ln
This variable contains a list of additional directories to be searched by
the compiler. The appropriate -I directives will be added to ccflags. This is intended to simplify setting
local directories from the Configure command line. It's not much, but it
parallels the loclibpth stuff in libpth.U.
This variable holds the paths used to find local libraries. It is prepended to libpth, and is intended to be easily set from the command line.
This variable contains the value of the LONG_DOUBLESIZE symbol, which indicates to the
C program how many bytes there are in a long double,
if this system supports long doubles.
This variable contains the value of the LONGLONGSIZE symbol, which indicates to the
C program how many bytes there are in a long long, if
this system supports long long.
This variable contains the value of the LONGSIZE symbol, which indicates to the
C program how many bytes there are in a long.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the ls program. After Configure runs, the value is
reset to a plain ls and is not useful.
This variable defines lseektype to be something like off_t, long, or whatever type is used to declare lseek offset's type in the kernel (which also appears to be lseek's return type).
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the make program. After Configure runs, the value is
reset to a plain make and is not useful.
Some versions of make set the variable MAKE. Others do not. This variable contains the string to be included in Makefile.SH
so that MAKE is set if needed, and not if not needed. Possible values are:
make_set_make=# # If your make program handles this for you, make_set_make=MAKE=$make # if it doesn't.
I used a comment character so that we can distinguish
a
set value (from a previous config.sh or Configure -D option) from an uncomputed value.
This variable contains the name of the malloc.o that this package generates, if that malloc.o is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles. See mallocsrc.
This variable contains the name of the malloc.c that comes with the package, if that malloc.c is preferred over the system malloc. Otherwise the value is null. This variable is intended for generating Makefiles.
This variable contains the kind of ptr returned by malloc and realloc.
This variable contains the name of the directory in which manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself.
This variable is the same as the man1dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
This variable contains the extension that the manual page should have: one
of n, l, or 1. The Makefile must supply the .. See man1dir.
This variable contains the name of the directory in which manual source pages are to be put. It is the responsibility of the Makefile.SH to get the value of this into the proper command. You must be prepared to do the ~name expansion yourself.
This variable is the same as the man3dir variable, but is filename expanded at configuration time, for convenient use in makefiles.
This variable contains the extension that the manual page should have: one
of n, l, or 3. The Makefile must supply the .. See man3dir.
This variable contains a flag which will tell the C compiler and loader to produce a program running with a medium memory model. If the medium model is not supported, contains the flag to produce large model programs. It is up to the Makefile to use this.
This variable holds the environment type for the mips system. Possible values are ``BSD 4.3'' and ``System V''.
This variable is be used internally by Configure to determine the full pathname (if any) of the mkdir program. After Configure runs, the value is reset to a plain mkdir and is not useful.
This variable contains the list of memory models supported by this system. Possible component values are none, split, unsplit, small, medium, large, and huge. The component values are space separated.
This variable defines modetype to be something like mode_t, int, unsigned short, or whatever type is used to declare file modes for system calls.
This variable is be used internally by Configure to determine the full
pathname (if any) of the more program. After Configure runs, the value is
reset to a plain more and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable holds the architecture name computed by Configure in a previous run. It is not intended to be perused by any user and should never be set in a hint file.
This variable contains the eventual value of the MYDOMAIN symbol, which is the domain of the host the program is going to run on. The
domain must be appended to myhostname to form a complete host name. The dot
comes with mydomain, and need not be supplied by the program.
This variable contains the eventual value of the MYHOSTNAME symbol, which is the name of the host the program is going to run on. The
domain is not kept with hostname, but must be gotten from mydomain. The dot
comes with mydomain, and need not be supplied by the program.
The output of uname -a if available, otherwise the hostname. On Xenix, pseudo variables
assignments in the output are stripped, thank you. The whole thing is then
lower-cased.
This variable contains the -n flag if that is what causes the echo command to suppress newline. Otherwise
it is null. Correct usage is
$echo $n "prompt for a question: $c".
This variable holds the type used for the 2nd argument to
gethostbyaddr(). Usually, this is int or size_t or unsigned. This is only useful if you have
gethostbyaddr(), naturally.
This variable holds the type used for the 1st argument to
gethostbyaddr(). Usually, this is char * or void *, possibly with or without a const prefix. This is only useful if you have
gethostbyaddr(), naturally.
This variable holds the type used for the argument to
gethostbyname(). Usually, this is char * or const char *. This is only useful if you have
gethostbyname(), naturally.
This variable holds the type used for the 1st argument to
getnetbyaddr(). Usually, this is int or long. This is only useful if you have
getnetbyaddr(), naturally.
This variable is be used internally by Configure to determine the full
pathname (if any) of the nm program. After Configure runs, the value is
reset to a plain nm and is not useful.
This variable holds the options that may be necessary for nm.
This variable holds the options that may be necessary for nm to work on a
shared library but that can not be used on an archive library. Currently,
this is only used by Linux, where nm --dynamic is *required* to get symbols
from an ELF library which has been stripped, but nm --dynamic is *fatal* on an archive
library. Maybe Linux should just always set usenm=false.
This variable holds a list of all non-xs extensions included in the package. All of them will be built.
This variable is be used internally by Configure to determine the full
pathname (if any) of the nroff program. After Configure runs, the value is
reset to a plain nroff and is not useful.
This variable bears the symbol value to be used during
open() or
fcntl() to turn on non-blocking
I/O for a file descriptor. If you wish to switch between blocking and non-blocking, you may try
ioctl(
FIOSNBIO) instead, but that is only supported by some devices.
This is an old synonym for _o.
This variable contains any optimizer/debugger flag that should be used. It is up to the Makefile to use it.
This variable is true if the components of libraries must be ordered (with `lorder $* | tsort`)
before placing them in an archive. Set to
false if ranlib or ar can generate random libraries.
This variable contains the operating system name (e.g. sunos, solaris, hpux, etc.). It can be useful later on for setting defaults. Any spaces are replaced with underscores. It is set to a null string if we can't figure it out.
This variable contains the operating system version (e.g. 4.1.3, 5.2, etc.). It is primarily used for helping select an appropriate hints file, but might be useful elsewhere for setting defaults. It is set to '' if we can't figure it out. We try to be flexible about how much of the version number to keep, e.g. if 4.1.1, 4.1.2, and 4.1.3 are essentially the same for this package, hints files might just be os_4.0 or os_4.1, etc., not keeping separate files for each little release.
This variable contains the name of the package being constructed. It is primarily intended for the use of later Configure units.
This variable contains the name of the preferred pager on the system. Usual values are (the full pathnames of) more, less, pg, or cat.
This variable contains a command that produces the text of the
/etc/passwd file. This is normally ``cat /etc/passwd'', but can be ``ypcat passwd'' when NIS is used.
The patchlevel level of this package. The value of patchlevel comes from the patchlevel.h file.
This is an old synonym for p_ in Head.U, the character used to separate elements in the command shell search PATH.
This variable is be used internally by Configure to determine the full
pathname (if any) of the perl program. After Configure runs, the value is
reset to a plain perl and is not useful.
Electronic mail address of the perl5 administrator.
This variable contains the eventual value of the PERLPATH symbol, which contains the name of the perl interpreter to be used in shell
scripts and in the ``eval exec'' idiom.
This variable is be used internally by Configure to determine the full
pathname (if any) of the pg program. After Configure runs, the value is
reset to a plain pg and is not useful.
This variable contains the eventual value of the PHOSTNAME symbol, which is a command that can be fed to
popen() to get the host name.
The program should probably not presume that the domain is or isn't there
already.
This variable defines PIDTYPE to be something like pid_t, int, ushort, or whatever type is used to
declare process ids in the kernel.
Holds the private path used by Configure to find out the libraries. Its value is prepend to libpth. This variable takes care of special machines, like the mips. Usually, it should be empty.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable holds the name of the directory below which the user will install the package. Usually, this is /usr/local, and executables go in /usr/local/bin, library stuff in /usr/local/lib, man pages in /usr/local/man, etc. It is only used to set defaults for things in bin.U, mansrc.U, privlib.U, or scriptdir.U.
This variable holds the full absolute path of the directory below which the user will install the package. Derived from prefix.
This variable contains the eventual value of the PRIVLIB symbol, which is the name of the private library for this package. It may
have a ~ on the front. It is up to the makefile to eventually create this directory
while performing installation (with ~ substitution).
This variable is the ~name expanded version of privlib, so that you may use it directly in Makefiles or shell scripts.
This variable holds the eventual value of CAN_PROTOTYPE, which indicates the
C compiler can handle funciton prototypes.
This variable contains the value of the PTRSIZE symbol, which indicates to the
C program how many bytes there are in a pointer.
This variable contains the eventual value of the RANDBITS symbol, which indicates to the
C program how many bits of random number the
rand() function produces.
This variable is set to the pathname of the ranlib program, if it is needed
to generate random libraries. Set to : if ar can generate random libraries or if random libraries are not
supported
This variable holds the return code from
read() when no data is present.
It should be -1, but some systems return 0 when O_NDELAY is used, which is a shame because you cannot make the difference between no
data and an EOF.. Sigh!
This variable is be used internally by Configure to determine the full
pathname (if any) of the rm program. After Configure runs, the value is
reset to a plain rm and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains true or false depending whether the nm extraction should be performed or not, according
to the value of usenm and the flags on the Configure command line.
This variable holds the name of the directory in which the user wants to put publicly scripts for the package in question. It is either the same directory as for binaries, or a special one that can be mounted across different architectures, like /usr/share. Programs must be prepared to deal with ~name expansion.
This variable is the same as scriptdir, but is filename expanded at configuration time, for programs not wanting to bother with it.
This variable is be used internally by Configure to determine the full
pathname (if any) of the sed program. After Configure runs, the value is
reset to a plain sed and is not useful.
This variable holds the type used for the 2nd, 3rd, and 4th arguments to
select. Usually, this is fd_set *, if HAS_FD_SET
is defined, and int * otherwise. This is only useful if you have
select(), naturally.
This variable is be used internally by Configure to determine the full
pathname (if any) of the sendmail program. After Configure runs, the value
is reset to a plain sendmail and is not useful.
This variable contains the full pathname of the shell used on this system
to execute Bourne shell scripts. Usually, this will be
/bin/sh, though it's possible that some systems will have /bin/ksh,
/bin/pdksh, /bin/ash, /bin/bash, or even something such as
D:/bin/sh.exe. This unit comes before Options.U, so you can't set sh with a -D
option, though you can override this (and startsh) with -O -Dsh=<EM>/bin/whatever</EM> -Dstartsh=whatever
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains the string #! if this system supports that construct.
This symbol contains the type of pointer returned by
shmat(). It can be void * or char *.
This variable contains the value of the SHORTSIZE symbol which indicates to the
C program how many bytes there are in a short.
If the user builds a shared libperl.so, then we need to tell the
perl executable where it will be able to find the installed libperl.so. One way to do this on some systems is to set the environment variable
LD_RUN_PATH to the directory that will be the final location of the shared libperl.so. The makefile can use this with something like
$shrpenv $(C<CC>) -o perl F<perlmain.o> $libperl $libs
Typical values are
shrpenv="env C<LD_RUN_PATH>=$F<archlibexp/C<CORE>>"
or
shrpenv=''
See the main perl F<Makefile.SH> for actual working usage. Alternatively, we might be able to use a command line option such as -R $F<archlibexp/C<CORE>> (Solaris, NetBSD) or -Wl,-rpath $F<archlibexp/C<CORE>> (Linux).
This variable tells further Configure units whether your sh can handle # comments.
This variable holds the signal names, space separated. The leading
SIG in signal name is removed.
A ZERO is prepended to the list. This is currently not used.
This variable holds the signal names, enclosed in double quotes and
separated by commas, suitable for use in the SIG_NAME definition below.
A ZERO is prepended to the list, and the list is terminated with a plain 0. The
leading SIG in signal names is removed. See sig_num.
This variable holds the signal numbers, comma separated.
A 0 is prepended to the list (corresponding to the
fake SIGZERO), and the list is terminated with a 0. Those numbers correspond to the
value of the signal listed in the same place within the sig_name list.
This variable holds the type of the signal handler (void or int).
This variable contains the eventual value of the SITEARCH symbol, which is the name of the private library for this package. It may
have a ~ on the front. It is up to the makefile to eventually create this directory
while performing installation (with ~ substitution).
This variable is the ~name expanded version of sitearch, so that you may use it directly in Makefiles or shell scripts.
This variable contains the eventual value of the SITELIB symbol, which is the name of the private library for this package. It may
have a ~ on the front. It is up to the makefile to eventually create this directory
while performing installation (with ~ substitution).
This variable is the ~name expanded version of sitelib, so that you may use it directly in Makefiles or shell scripts.
This variable defines sizetype to be something like size_t, unsigned long, or whatever type is used to declare length parameters for string functions.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains a flag which will tell the C compiler and loader to produce a program running with a small memory model. It is up to the Makefile to use this.
This variable holds the extension used to identify shared libraries (also
known as shared objects) on the system. Usually set to so.
This variable has any cpp -I flags needed for socket support.
This variable has the names of any libraries needed for socket support.
This variable is be used internally by Configure to determine the full pathname (if any) of the sort program. After Configure runs, the value is reset to a plain sort and is not useful.
This variable contains the name of the package being constructed, with the first letter uppercased, i.e. suitable for starting sentences.
This variable contains the command necessary to spit out a runnable shell
on this system. It is either cat or a grep -v for # comments.
This variable contains a flag which will tell the C compiler and loader to produce a program that will run in separate I and D space, for those machines that support separation of instruction and data space. It is up to the Makefile to use this.
This variable holds the path to the package source. It is up to the
Makefile to use this variable and set VPATH accordingly to find the sources remotely.
This variable defines ssizetype to be something like ssize_t, long or int. It is used by functions that return a count of bytes or an error condition. It must be a signed type. We will pick a type such that
sizeof(SSize_t) ==
sizeof(Size_t).
This variable contains the string to put on the front of a perl script to make sure (hopefully) that it runs with perl and not some shell. Of course, that leading line must be followed by the classical perl idiom:
eval 'exec perl -S $0 ${1+C<$@>}'
if $running_under_some_shell;
to guarantee perl startup should the shell execute the script. Note that this magic incatation is not understood by csh.
This variable contains the string to put on the front of a shell script to make sure (hopefully) that it runs with sh and not some other shell.
This variable holds a list of XS extension files we want to link statically into the package. It is used by Makefile.
This variable conditionally defines STDCHAR to be the type of char used in stdio.h. It has the values ``unsigned char'' or char.
This variable defines how, given a FILE pointer, fp, to access the _base field (or equivalent) of stdio.h's FILE structure. This will be used to define the macro
FILE_base(fp).
This variable defines how, given a FILE pointer, fp, to determine the number of bytes store in the I/O buffer pointer to by the _base field (or equivalent) of stdio.h's FILE structure. This will be used to define the macro
FILE_bufsiz(fp).
This variable defines how, given a FILE pointer, fp, to access the _cnt field (or equivalent) of stdio.h's FILE structure. This will be used to define the macro
FILE_cnt(fp).
This variable defines how, given a FILE pointer, fp, to tell stdio to refill it's internal buffers (?). This will be used to define the macro
FILE_filbuf(fp).
This variable defines how, given a FILE pointer, fp, to access the _ptr field (or equivalent) of stdio.h's FILE structure. This will be used to define the macro
FILE_ptr(fp).
This variable holds the full path of the string header that will be used. Typically /usr/include/string.h or /usr/include/strings.h.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
The subversion level of this package. The value of subversion comes from the patchlevel.h file. This is unique to perl.
This variable holds the place where the manual is located on this system. It is not the place where the user wants to put his manual pages. Rather it is the place where Configure may look to find manual for unix commands (section 1 of the manual usually). See mansrc.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the tee program. After Configure runs, the value is
reset to a plain tee and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the test program. After Configure runs, the value is
reset to a plain test and is not useful.
This variable holds the full path of the included time
header(s).
This variable holds the type returned by
time(). It can be long, or
time_t on BSD sites (in which case <sys/types.h> should be included). Anyway, the
type Time_t should be used.
This variable is be used internally by Configure to determine the full
pathname (if any) of the touch program. After Configure runs, the value is
reset to a plain touch and is not useful.
This variable is be used internally by Configure to determine the full pathname (if any) of the tr program. After Configure runs, the value is reset to a plain tr and is not useful.
This variable contains the value to be passed to the
tr(1) command to transliterate
a newline. Typical values are
\012 and \n. This is needed for EBCDIC systems where newline is not necessarily \012.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable defines Uid_t to be something like uid_t, int, ushort, or whatever type is used to declare user ids in the kernel.
This variable is be used internally by Configure to determine the full
pathname (if any) of the uname program. After Configure runs, the value is
reset to a plain uname and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the uniq program. After Configure runs, the value is
reset to a plain uniq and is not useful.
This variable indicates if the the system supports dynamic loading of some sort. See also dlsrc and dlobj.
This variable contains y if the malloc that comes with this package is desired over the system's version of malloc. People often include special versions of malloc for effiency, but such versions are often less portable. See also mallocsrc and mallocobj. If this is y, then -lmalloc is removed from $libs.
This variable contains true or false depending whether the nm extraction is wanted or not.
This variable holds either true or false to indicate whether the Opcode extension should be used. The sole use for
this currently is to allow an easy mechanism for users to skip the Opcode
extension from the Configure command line.
This variable conditionally defines the USE_PERLIO symbol, and indicates that the PerlIO abstraction should be used
throughout.
This variable holds either true or false to indicate whether the POSIX extension should be used. The sole use for this currently is to allow an
easy mechanism for hints files to indicate that POSIX will not compile on a particular system.
This variable is set to true when the user agrees to use sfio. It is set to false when sfio is not available or when the user explicitely requests not to use sfio. It is here primarily so that command-line settings can override the auto-detection of d_sfio without running into a ``WHOA THERE''.
This variable is set to yes if the user wishes to build a shared libperl, and no otherwise.
This variable conditionally defines the USE_THREADS symbol, and indicates that Perl should be built to use threads.
This variable is set to true when the user accepts to use vfork. It is set to false when no vfork is available or when the user explicitely requests not to use vfork.
This variable holds the path of the include files, which is usually /usr/include. It is mainly used by other Configure units.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
The full version number of this package. This combines baserev, patchlevel, and subversion to get the full version number, including any possible subversions. Care is taken to use the C locale in order to get something like 5.004 instead of 5,004. This is unique to perl.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable contains the eventual value of the VOIDFLAGS symbol, which indicates how much support of the void type is given by this
compiler. See VOIDFLAGS for more info.
This variable is defined but not used by Configure. The value is a plain '' and is not useful.
This variable is be used internally by Configure to determine the full
pathname (if any) of the zip program. After Configure runs, the value is
reset to a plain zip and is not useful.
This module contains a good example of how to use tie to implement a cache and an example of how to make a tied variable readonly to those outside of it.
If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.