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PL/Perl portability fix: absorb relevant -D switches from Perl.

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Back-patch of commit 3c163a7fc7,
which see for more info.

Also throw in commit b4cc35fbb7,
so Coverity doesn't whine about the back branches.

Ashutosh Sharma, some adjustments by me

Discussion: https://postgr.es/m/CANFyU97OVQ3+Mzfmt3MhuUm5NwPU=-FtbNH5Eb7nZL9ua8=rcA@mail.gmail.com
This commit is contained in:
Tom Lane
2017-07-31 12:38:35 -04:00
parent b92f17277e
commit 0d8f015e77
7 changed files with 82 additions and 13 deletions
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25
config/perl.m4
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@ -49,6 +49,31 @@ AC_DEFUN([PGAC_CHECK_PERL_CONFIGS],
[m4_foreach([pgac_item], [$1], [PGAC_CHECK_PERL_CONFIG(pgac_item)])])
# PGAC_CHECK_PERL_EMBED_CCFLAGS
# -----------------------------
# We selectively extract stuff from $Config{ccflags}. We don't really need
# anything except -D switches, and other sorts of compiler switches can
# actively break things if Perl was compiled with a different compiler.
# Moreover, although Perl likes to put stuff like -D_LARGEFILE_SOURCE and
# -D_FILE_OFFSET_BITS=64 here, it would be fatal to try to compile PL/Perl
# to a different libc ABI than core Postgres uses. The available information
# says that all the symbols that affect Perl's own ABI begin with letters,
# so it should be sufficient to adopt -D switches for symbols not beginning
# with underscore.
# For debugging purposes, let's have the configure output report the raw
# ccflags value as well as the set of flags we chose to adopt.
AC_DEFUN([PGAC_CHECK_PERL_EMBED_CCFLAGS],
[AC_REQUIRE([PGAC_PATH_PERL])
AC_MSG_CHECKING([for CFLAGS recommended by Perl])
perl_ccflags=`$PERL -MConfig -e ['print $Config{ccflags}']`
AC_MSG_RESULT([$perl_ccflags])
AC_MSG_CHECKING([for CFLAGS to compile embedded Perl])
perl_embed_ccflags=`$PERL -MConfig -e ['foreach $f (split(" ",$Config{ccflags})) {print $f, " " if ($f =~ /^-D[^_]/)}']`
AC_SUBST(perl_embed_ccflags)dnl
AC_MSG_RESULT([$perl_embed_ccflags])
])# PGAC_CHECK_PERL_EMBED_CCFLAGS
# PGAC_CHECK_PERL_EMBED_LDFLAGS
# -----------------------------
# We are after Embed's ldopts, but without the subset mentioned in