config.pod

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From F<Loc.U>:

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

=item C<chmod>

From F<Loc.U>:

This variable is used internally by Configure to determine the
full pathname (if any) of the chmod program.  After Configure runs,
the value is reset to a plain C<chmod> and is not useful.

=item C<chown>

From F<Loc.U>:

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

=item C<clocktype>

From F<d_times.U>:

This variable holds the type returned by times(). It can be long,
or clock_t on C<BSD> sites (in which case <sys/types.h> should be
included).

=item C<comm>

From F<Loc.U>:

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

=item C<compress>

From F<Loc.U>:

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

=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 concatenation 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<crypt_r_proto>

From F<d_crypt_r.U>:

This variable encodes the prototype of crypt_r.
It is zero if d_crypt_r is undef, and one of the
C<REENTRANT_PROTO_T_ABC> macros of F<reentr.h> if d_crypt_r
is defined.

=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.

=item C<ctermid_r_proto>

From F<d_ctermid_r.U>:

This variable encodes the prototype of ctermid_r.
It is zero if d_ctermid_r is undef, and one of the
C<REENTRANT_PROTO_T_ABC> macros of F<reentr.h> if d_ctermid_r
is defined.

=item C<ctime_r_proto>

From F<d_ctime_r.U>:

This variable encodes the prototype of ctime_r.
It is zero if d_ctime_r is undef, and one of the
C<REENTRANT_PROTO_T_ABC> macros of F<reentr.h> if d_ctime_r
is defined.

=back

=head2 d

=over 4

=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_aintl>

From F<d_aintl.U>:

This variable conditionally defines the C<HAS_AINTL> symbol, which
indicates to the C program that the aintl() routine is available.
If copysignl is also present we can emulate modfl.

=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_asctime_r>

From F<d_asctime_r.U>:

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

=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_attribute_format>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_FORMAT>, which
indicates the C compiler can check for printf-like formats.

=item C<d_attribute_malloc>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_MALLOC>, which
indicates the C compiler can understand functions as having
malloc-like semantics.

=item C<d_attribute_nonnull>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_NONNULL>, which
indicates that the C compiler can know that certain arguments
must not be C<NULL>, and will check accordingly at compile time.

=item C<d_attribute_noreturn>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_NORETURN>, which
indicates that the C compiler can know that certain functions
are guaranteed never to return.

=item C<d_attribute_pure>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_PURE>, which
indicates that the C compiler can know that certain functions
are C<pure> functions, meaning that they have no side effects, and
only rely on function input F<and/or> global data for their results.

=item C<d_attribute_unused>

From F<d_attribut.U>:

This variable conditionally defines C<HASATTRIBUTE_UNUSED>, which
indicates that the C compiler can know that certain variables
and arguments may not always be used, and to not throw warnings
if they don't get used.

=item C<d_attribute_warn_unused_result>

From F<d_attribut.U>:

This variable conditionally defines
C<HASATTRIBUTE_WARN_UNUSED_RESULT>, which indicates that the C
compiler can know that certain functions have a return values
that must not be ignored, such as malloc() or open().

=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_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_builtin_choose_expr>

From F<d_builtin.U>:

This conditionally defines C<HAS_BUILTIN_CHOOSE_EXPR>, which
indicates that the compiler supports __builtin_choose_expr(x,y,z).
This built-in function is analogous to the C<x?y:z> operator in C,
except that the expression returned has its type unaltered by
promotion rules. Also, the built-in function does not evaluate
the expression that was not chosen.

=item C<d_builtin_expect>

From F<d_builtin.U>:

This conditionally defines C<HAS_BUILTIN_EXPECT>, which indicates
that the compiler supports __builtin_expect(exp,c).  You may use
__builtin_expect to provide the compiler with branch prediction
information.

=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_c99_variadic_macros>

From F<d_c99_variadic.U>:

This variable conditionally defines the HAS_C99_VARIADIC_MACROS
symbol, which indicates to the C program that C99 variadic macros
are available.

=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_class>

From F<d_class.U>:

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

=item C<d_clearenv>

From F<d_clearenv.U>:

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

=item C<d_closedir>

From F<d_closedir.U>:

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

=item C<d_cmsghdr_s>

From F<d_cmsghdr_s.U>:

This variable conditionally defines the C<HAS_STRUCT_CMSGHDR> symbol,
which indicates that the struct cmsghdr is supported.

=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_copysignl>

From F<d_copysignl.U>:

This variable conditionally defines the C<HAS_COPYSIGNL> symbol, which
indicates to the C program that the copysignl() routine is available.
If aintl is also present we can emulate modfl.

=item C<d_cplusplus>

From F<d_cplusplus.U>:

This variable conditionally defines the C<USE_CPLUSPLUS> symbol, which
indicates that a C++ compiler was used to compiled Perl and will be
used to compile extensions.

=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_crypt_r>

From F<d_crypt_r.U>:

This variable conditionally defines the C<HAS_CRYPT_R> symbol,