config.pod

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=item C<d_ilogbl>

From F<d_ilogbl.U>:

This variable conditionally defines the C<HAS_ILOGBL> symbol, which
indicates to the C program that the ilogbl() routine is available.
If scalbnl is also present we can emulate frexpl.

=item C<d_inc_version_list>

From F<inc_version_list.U>:

This variable conditionally defines C<PERL_INC_VERSION_LIST>.
It is set to undef when C<PERL_INC_VERSION_LIST> is empty.

=item C<d_index>

From F<d_strchr.U>:

This variable conditionally defines C<HAS_INDEX> if index() and
rindex() are available for string searching.

=item C<d_inetaton>

From F<d_inetaton.U>:

This variable conditionally defines the C<HAS_INET_ATON> symbol, which
indicates to the C program that the inet_aton() function is available
to parse C<IP> address C<dotted-quad> strings.

=item C<d_int64_t>

From F<d_int64_t.U>:

This symbol will be defined if the C compiler supports int64_t.

=item C<d_isascii>

From F<d_isascii.U>:

This variable conditionally defines the C<HAS_ISASCII> constant,
which indicates to the C program that isascii() is available.

=item C<d_isfinite>

From F<d_isfinite.U>:

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

=item C<d_isinf>

From F<d_isinf.U>:

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

=item C<d_isnan>

From F<d_isnan.U>:

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

=item C<d_isnanl>

From F<d_isnanl.U>:

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

=item C<d_killpg>

From F<d_killpg.U>:

This variable conditionally defines the C<HAS_KILLPG> symbol, which
indicates to the C program that the killpg() routine is available
to kill process groups.

=item C<d_lchown>

From F<d_lchown.U>:

This variable conditionally defines the C<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).

=item C<d_ldbl_dig>

From F<d_ldbl_dig.U>:

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

=item C<d_libm_lib_version>

From F<d_libm_lib_version.U>:

This variable conditionally defines the C<LIBM_LIB_VERSION> symbol,
which indicates to the C program that F<math.h> defines C<_LIB_VERSION>
being available in libm

=item C<d_link>

From F<d_link.U>:

This variable conditionally defines C<HAS_LINK> if link() is
available to create hard links.

=item C<d_localtime_r>

From F<d_localtime_r.U>:

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

=item C<d_localtime_r_needs_tzset>

From F<d_localtime_r.U>:

This variable conditionally defines the C<LOCALTIME_R_NEEDS_TZSET>
symbol, which makes us call tzset before localtime_r()

=item C<d_locconv>

From F<d_locconv.U>:

This variable conditionally defines C<HAS_LOCALECONV> if localeconv() is
available for numeric and monetary formatting conventions.

=item C<d_lockf>

From F<d_lockf.U>:

This variable conditionally defines C<HAS_LOCKF> if lockf() is
available to do file locking.

=item C<d_longdbl>

From F<d_longdbl.U>:

This variable conditionally defines C<HAS_LONG_DOUBLE> if
the long double type is supported.

=item C<d_longlong>

From F<d_longlong.U>:

This variable conditionally defines C<HAS_LONG_LONG> if
the long long type is supported.

=item C<d_lseekproto>

From F<d_lseekproto.U>:

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

=item C<d_lstat>

From F<d_lstat.U>:

This variable conditionally defines C<HAS_LSTAT> if lstat() is
available to do file stats on symbolic links.

=item C<d_madvise>

From F<d_madvise.U>:

This variable conditionally defines C<HAS_MADVISE> if madvise() is
available to map a file into memory.

=item C<d_malloc_good_size>

From F<d_malloc_size.U>:

This symbol, if defined, indicates that the malloc_good_size
routine is available for use.

=item C<d_malloc_size>

From F<d_malloc_size.U>:

This symbol, if defined, indicates that the malloc_size
routine is available for use.

=item C<d_mblen>

From F<d_mblen.U>:

This variable conditionally defines the C<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.

=item C<d_mbstowcs>

From F<d_mbstowcs.U>:

This variable conditionally defines the C<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.

=item C<d_mbtowc>

From F<d_mbtowc.U>:

This variable conditionally defines the C<HAS_MBTOWC> symbol, which
indicates to the C program that the mbtowc() routine is available
to convert multibyte to a wide character.

=item C<d_memchr>

From F<d_memchr.U>:

This variable conditionally defines the C<HAS_MEMCHR> symbol, which
indicates to the C program that the memchr() routine is available
to locate characters within a C string.

=item C<d_memcmp>

From F<d_memcmp.U>:

This variable conditionally defines the C<HAS_MEMCMP> symbol, which
indicates to the C program that the memcmp() routine is available
to compare blocks of memory.

=item C<d_memcpy>

From F<d_memcpy.U>:

This variable conditionally defines the C<HAS_MEMCPY> symbol, which
indicates to the C program that the memcpy() routine is available
to copy blocks of memory.

=item C<d_memmove>

From F<d_memmove.U>:

This variable conditionally defines the C<HAS_MEMMOVE> symbol, which
indicates to the C program that the memmove() routine is available
to copy potentatially overlapping blocks of memory.

=item C<d_memset>

From F<d_memset.U>:

This variable conditionally defines the C<HAS_MEMSET> symbol, which
indicates to the C program that the memset() routine is available
to set blocks of memory.

=item C<d_mkdir>

From F<d_mkdir.U>:

This variable conditionally defines the C<HAS_MKDIR> symbol, which
indicates to the C program that the mkdir() routine is available
to create F<directories.>.

=item C<d_mkdtemp>

From F<d_mkdtemp.U>:

This variable conditionally defines the C<HAS_MKDTEMP> symbol, which
indicates to the C program that the mkdtemp() routine is available
to exclusively create a uniquely named temporary directory.

=item C<d_mkfifo>

From F<d_mkfifo.U>:

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

=item C<d_mkstemp>

From F<d_mkstemp.U>:

This variable conditionally defines the C<HAS_MKSTEMP> symbol, which
indicates to the C program that the mkstemp() routine is available
to exclusively create and open a uniquely named temporary file.

=item C<d_mkstemps>

From F<d_mkstemps.U>:

This variable conditionally defines the C<HAS_MKSTEMPS> symbol, which
indicates to the C program that the mkstemps() routine is available
to exclusively create and open a uniquely named (with a suffix)
temporary file.

=item C<d_mktime>

From F<d_mktime.U>:

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

=item C<d_mmap>

From F<d_mmap.U>:

This variable conditionally defines C<HAS_MMAP> if mmap() is
available to map a file into memory.

=item C<d_modfl>

From F<d_modfl.U>:

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

=item C<d_modfl_pow32_bug>

From F<d_modfl.U>:

This variable conditionally defines the HAS_MODFL_POW32_BUG symbol,
which indicates that modfl() is broken for long doubles >= pow(2, 32).
For example from 4294967303.150000 one would get 4294967302.000000
and 1.150000.  The bug has been seen in certain versions of glibc,
release 2.2.2 is known to be okay.

=item C<d_modflproto>

From F<d_modfl.U>:

This symbol, if defined, indicates that the system provides
a prototype for the modfl() function.  Otherwise, it is up
to the program to supply one.  C99 says it should be
long double modfl(long double, long double *);

=item C<d_mprotect>

From F<d_mprotect.U>:

This variable conditionally defines C<HAS_MPROTECT> if mprotect() is
available to modify the access protection of a memory mapped file.

=item C<d_msg>

From F<d_msg.U>:

This variable conditionally defines the C<HAS_MSG> symbol, which
indicates that the entire msg*(2) library is present.

=item C<d_msg_ctrunc>

From F<d_socket.U>:

This variable conditionally defines the C<HAS_MSG_CTRUNC> symbol,
which indicates that the C<MSG_CTRUNC> is available.  #ifdef is
not enough because it may be an enum, glibc has been known to do this.

=item C<d_msg_dontroute>

From F<d_socket.U>:

This variable conditionally defines the C<HAS_MSG_DONTROUTE> symbol,
which indicates that the C<MSG_DONTROUTE> is available.  #ifdef is
not enough because it may be an enum, glibc has been known to do this.

=item C<d_msg_oob>

From F<d_socket.U>:

This variable conditionally defines the C<HAS_MSG_OOB> symbol,
which indicates that the C<MSG_OOB> is available.  #ifdef is
not enough because it may be an enum, glibc has been known to do this.

=item C<d_msg_peek>

From F<d_socket.U>:

This variable conditionally defines the C<HAS_MSG_PEEK> symbol,
which indicates that the C<MSG_PEEK> is available.  #ifdef is
not enough because it may be an enum, glibc has been known to do this.

=item C<d_msg_proxy>

From F<d_socket.U>:

This variable conditionally defines the C<HAS_MSG_PROXY> symbol,
which indicates that the C<MSG_PROXY> is available.  #ifdef is
not enough because it may be an enum, glibc has been known to do this.

=item C<d_msgctl>

From F<d_msgctl.U>:

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

=item C<d_msgget>

From F<d_msgget.U>:

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

=item C<d_msghdr_s>

From F<d_msghdr_s.U>:

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

=item C<d_msgrcv>

From F<d_msgrcv.U>:

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

=item C<d_msgsnd>

From F<d_msgsnd.U>:

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

=item C<d_msync>

From F<d_msync.U>:

This variable conditionally defines C<HAS_MSYNC> if msync() is
available to synchronize a mapped file.

=item C<d_munmap>

From F<d_munmap.U>:

This variable conditionally defines C<HAS_MUNMAP> if munmap() is
available to unmap a region mapped by mmap().

=item C<d_mymalloc>

From F<mallocsrc.U>:

This variable conditionally defines C<MYMALLOC> in case other parts
of the source want to take special action if C<MYMALLOC> is used.
This may include different sorts of profiling or error detection.

=item C<d_nice>

From F<d_nice.U>:

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

=item C<d_nl_langinfo>

From F<d_nl_langinfo.U>:

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

=item C<d_nv_preserves_uv>

From F<perlxv.U>:

This variable indicates whether a variable of type nvtype
can preserve all the bits a variable of type uvtype.

=item C<d_nv_zero_is_allbits_zero>

From F<perlxv.U>:

This variable indicates whether a variable of type nvtype
stores 0.0 in memory as all bits zero.

=item C<d_off64_t>

From F<d_off64_t.U>:

This symbol will be defined if the C compiler supports off64_t.

=item C<d_old_pthread_create_joinable>

From F<d_pthrattrj.U>:

This variable conditionally defines pthread_create_joinable.
undef if F<pthread.h> defines C<PTHREAD_CREATE_JOINABLE>.

=item C<d_oldpthreads>

From F<usethreads.U>:

This variable conditionally defines the C<OLD_PTHREADS_API> symbol,
and indicates that Perl should be built to use the old
draft C<POSIX> threads C<API