config.pm

MSYS在windows下模拟了一个类unix的终端

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

=back

=head2 C

=over

=item C<CONFIGDOTSH>

From F<Oldsyms.U>:

This is set to C<true> in F<config.sh> so that a shell script
sourcing F<config.sh> can tell if it has been sourced already.

=item C<contains>

From F<contains.U>:

This variable holds the command to do a grep with a proper return
status.  On most sane systems it is simply C<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.

=item C<cp>

From F<Loc.U>:

This variable is 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 C<cp> and is not useful.

=item C<cpio>

From F<Loc.U>:

This variable is defined but not used by Configure.
The value is a plain '' and is not useful.

=item C<cpp>

From F<Loc.U>:

This variable is 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 C<cpp> and is not useful.

=item C<cpp_stuff>

From F<cpp_stuff.U>:

This variable contains an identification of the catenation mechanism
used by the C preprocessor.

=item C<cppccsymbols>

From F<Cppsym.U>:

The variable contains the symbols defined by the C compiler
when it calls cpp.  The symbols defined by the cc alone or cpp
alone are not in this list, see ccsymbols and cppsymbols.
The list is a space-separated list of symbol=value tokens.

=item C<cppflags>

From F<ccflags.U>:

This variable holds the flags that will be passed to the C pre-
processor. It is up to the Makefile to use it.

=item C<cpplast>

From F<cppstdin.U>:

This variable has the same functionality as cppminus, only it applies
to cpprun and not cppstdin.

=item C<cppminus>

From F<cppstdin.U>:

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 C<-> if cppstdin needs
a minus to specify standard input, otherwise the value is "".

=item C<cpprun>

From F<cppstdin.U>:

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.

=item C<cppstdin>

From F<cppstdin.U>:

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.

=item C<cppsymbols>

From F<Cppsym.U>:

The variable contains the symbols defined by the C preprocessor
alone.  The symbols defined by cc or by cc when it calls cpp are
not in this list, see ccsymbols and cppccsymbols.
The list is a space-separated list of symbol=value tokens.

=item C<crosscompile>

From F<crosscompile.U>:

This variable conditionally defines the C<CROSSCOMPILE> symbol
which signifies that the build process is be a cross-compilation.
This is normally set by hints files or from Configure command line.

=item C<cryptlib>

From F<d_crypt.U>:

This variable holds -lcrypt or the path to a F<libcrypt.a> archive if
the crypt() function is not defined in the standard C library. It is
up to the Makefile to use this.

=item C<csh>

From F<Loc.U>:

This variable is 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 C<csh> and is not useful.

=back

=head2 d

=over

=item C<d__fwalk>

From F<d__fwalk.U>:

This variable conditionally defines C<HAS__FWALK> if _fwalk() is
available to apply a function to all the file handles.

=item C<d_access>

From F<d_access.U>:

This variable conditionally defines C<HAS_ACCESS> if the access() system
call is available to check for access permissions using real IDs.

=item C<d_accessx>

From F<d_accessx.U>:

This variable conditionally defines the C<HAS_ACCESSX> symbol, which
indicates to the C program that the accessx() routine is available.

=item C<d_alarm>

From F<d_alarm.U>:

This variable conditionally defines the C<HAS_ALARM> symbol, which
indicates to the C program that the alarm() routine is available.

=item C<d_archlib>

From F<archlib.U>:

This variable conditionally defines C<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.

=item C<d_atolf>

From F<atolf.U>:

This variable conditionally defines the C<HAS_ATOLF> symbol, which
indicates to the C program that the atolf() routine is available.

=item C<d_atoll>

From F<atoll.U>:

This variable conditionally defines the C<HAS_ATOLL> symbol, which
indicates to the C program that the atoll() routine is available.

=item C<d_attribut>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE>, which
indicates the C compiler can check for function attributes,
such as printf formats.

=item C<d_bcmp>

From F<d_bcmp.U>:

This variable conditionally defines the C<HAS_BCMP> symbol if
the bcmp() routine is available to compare strings.

=item C<d_bcopy>

From F<d_bcopy.U>:

This variable conditionally defines the C<HAS_BCOPY> symbol if
the bcopy() routine is available to copy strings.

=item C<d_bincompat5005>

From F<bincompat5005.U>:

This variable conditionally defines BINCOMPAT5005 so that F<embed.h>
can take special action if this version of Perl should be
binary-compatible with Perl 5.005.  This is impossible for builds
that use features like threads and multiplicity it is always $undef
for those versions.

=item C<d_bsd>

From F<Guess.U>:

This symbol conditionally defines the symbol C<BSD> when running on a
C<BSD> system.

=item C<d_bsdgetpgrp>

From F<d_getpgrp.U>:

This variable conditionally defines C<USE_BSD_GETPGRP> if
getpgrp needs one arguments whereas C<USG> one needs none.

=item C<d_bsdsetpgrp>

From F<d_setpgrp.U>:

This variable conditionally defines C<USE_BSD_SETPGRP> if
setpgrp needs two arguments whereas C<USG> one needs none.
See also d_setpgid for a C<POSIX> interface.

=item C<d_bzero>

From F<d_bzero.U>:

This variable conditionally defines the C<HAS_BZERO> symbol if
the bzero() routine is available to set memory to 0.

=item C<d_casti32>

From F<d_casti32.U>:

This variable conditionally defines CASTI32, which indicates
whether the C compiler can cast large floats to 32-bit ints.

=item C<d_castneg>

From F<d_castneg.U>:

This variable conditionally defines C<CASTNEG>, which indicates
wether the C compiler can cast negative float to unsigned.

=item C<d_charvspr>

From F<d_vprintf.U>:

This variable conditionally defines C<CHARVSPRINTF> if this system
has vsprintf returning type (char*).  The trend seems to be to
declare it as "int vsprintf()".

=item C<d_chown>

From F<d_chown.U>:

This variable conditionally defines the C<HAS_CHOWN> symbol, which
indicates to the C program that the chown() routine is available.

=item C<d_chroot>

From F<d_chroot.U>:

This variable conditionally defines the C<HAS_CHROOT> symbol, which
indicates to the C program that the chroot() routine is available.

=item C<d_chsize>

From F<d_chsize.U>:

This variable conditionally defines the C<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.

=item C<d_closedir>

From F<d_closedir.U>:

This variable conditionally defines C<HAS_CLOSEDIR> if closedir() is
available.

=item C<d_const>

From F<d_const.U>:

This variable conditionally defines the C<HASCONST> symbol, which
indicates to the C program that this C compiler knows about the
const type.

=item C<d_crypt>

From F<d_crypt.U>:

This variable conditionally defines the C<CRYPT> symbol, which
indicates to the C program that the crypt() routine is available
to encrypt passwords and the like.

=item C<d_csh>

From F<d_csh.U>:

This variable conditionally defines the C<CSH> symbol, which
indicates to the C program that the C-shell exists.

=item C<d_cuserid>

From F<d_cuserid.U>:

This variable conditionally defines the C<HAS_CUSERID> symbol, which
indicates to the C program that the cuserid() routine is available
to get character login names.

=item C<d_dbl_dig>

From F<d_dbl_dig.U>:

This variable conditionally defines d_dbl_dig if this system's
header files provide C<DBL_DIG>, which is the number of significant
digits in a double precision number.

=item C<d_difftime>

From F<d_difftime.U>:

This variable conditionally defines the C<HAS_DIFFTIME> symbol, which
indicates to the C program that the difftime() routine is available.

=item C<d_dirnamlen>

From F<i_dirent.U>:

This variable conditionally defines C<DIRNAMLEN>, which indicates
to the C program that the length of directory entry names is
provided by a d_namelen field.

=item C<d_dlerror>

From F<d_dlerror.U>:

This variable conditionally defines the C<HAS_DLERROR> symbol, which
indicates to the C program that the dlerror() routine is available.

=item C<d_dlopen>

From F<d_dlopen.U>:

This variable conditionally defines the C<HAS_DLOPEN> symbol, which
indicates to the C program that the dlopen() routine is available.

=item C<d_dlsymun>

From F<d_dlsymun.U>:

This variable conditionally defines C<DLSYM_NEEDS_UNDERSCORE>, which
indicates that we need to prepend an underscore to the symbol
name before calling dlsym().

=item C<d_dosuid>

From F<d_dosuid.U>:

This variable conditionally defines the symbol C<DOSUID>, which
tells the C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.

=item C<d_drand48proto>

From F<d_drand48proto.U>:

This variable conditionally defines the HAS_DRAND48_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the drand48() function.  Otherwise, it is
up to the program to supply one.

=item C<d_dup2>

From F<d_dup2.U>:

This variable conditionally defines HAS_DUP2 if dup2() is
available to duplicate file descriptors.

=item C<d_eaccess>

From F<d_eaccess.U>:

This variable conditionally defines the C<HAS_EACCESS> symbol, which
indicates to the C program that the eaccess() routine is available.

=item C<d_endgrent>

From F<d_endgrent.U>:

This variable conditionally defines the C<HAS_ENDGRENT> symbol, which
indicates to the C program that the endgrent() routine is available
for sequential access of the group database.

=item C<d_endhent>

From F<d_endhent.U>:

This variable conditionally defines C<HAS_ENDHOSTENT> if endhostent() is
available to close whatever was being used for host queries.

=item C<d_endnent>

From F<d_endnent.U>:

This variable conditionally defines C<HAS_ENDNETENT> if endnetent() is
available to close whatever was being used for network queries.

=item C<d_endpent>

From F<d_endpent.U>:

This variable conditionally defines C<HAS_ENDPROTOENT> if endprotoent() is
available to close whatever was being used for protocol queries.

=item C<d_endpwent>

From F<d_endpwent.U>:

This variable conditionally defines the C<HAS_ENDPWENT> symbol, which
indicates to the C program that the endpwent() routine is available
for sequential access of the passwd database.

=item C<d_endsent>

From F<d_endsent.U>:

This variable conditionally defines C<HAS_ENDSERVENT> if endservent() is
available to close whatever was being used for service queries.

=item C<d_eofnblk>

From F<nblock_io.U>:

This variable conditionally defines C<EOF_NONBLOCK> if C<EOF> can be seen
when reading from a non-blocking F<I/O> source.

=item C<d_eunice>

From F<Guess.U>:

This variable conditionally defines the symbols C<EUNICE> and C<VAX>, which
alerts the C program that it must deal with ideosyncracies of C<VMS>.

=item C<d_fchmod>

From F<d_fchmod.U>:

This variable conditionally defines the C<HAS_FCHMOD> symbol, which
indicates to the C program that the fchmod() routine is available
to change mode of opened files.

=item C<d_fchown>

From F<d_fchown.U>:

This variable conditionally defines the C<HAS_FCHOWN> symbol, which
indicates to the C program that the fchown() routine is available
to change ownership of opened files.

=item C<d_fcntl>

From F<d_fcntl.U>:

This variable conditionally defines the C<HAS_FCNTL> symbol, and indicates
whether the fcntl() function exists

=item C<d_fcntl_can_lock>

From F<d_fcntl_can_lock.U>:

This variable conditionally defines the C<FCNTL_CAN_LOCK> symbol
and indicates whether file locking with fcntl() works.

=item C<d_fd_macros>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FD_MACROS> symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.

=item C<d_fd_set>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FD_SET> symbol,
which indicates if your C compiler knows about the fd_set typedef.

=item C<d_fds_bits>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FDS_BITS> symbol,
which indicates if your fd_set typedef contains the fds_bits member.