diff options
Diffstat (limited to 'config/perl.m4')
| -rw-r--r-- | config/perl.m4 | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/config/perl.m4 b/config/perl.m4 index 76b1a92e3a0..caefb0705e7 100644 --- a/config/perl.m4 +++ b/config/perl.m4 @@ -48,19 +48,23 @@ AC_DEFUN([PGAC_CHECK_PERL_CONFIGS], # 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. An exception is that we need to let through -# -D_USE_32BIT_TIME_T if it's present. (We probably could restrict that to -# only get through on Windows, but for the moment we let it through always.) -# 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. +# We selectively extract stuff from $Config{ccflags}. 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. 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 most symbols that affect +# Perl's own ABI begin with letters, so it's almost sufficient to adopt -D +# switches for symbols not beginning with underscore. Some exceptions are the +# Windows-specific -D_USE_32BIT_TIME_T and -D__MINGW_USE_VC2005_COMPAT; see +# Mkvcbuild.pm for details. We absorb the former when Perl reports it. Perl +# never reports the latter, and we don't attempt to deduce when it's needed. +# Consequently, we don't support using MinGW to link to MSVC-built Perl. As +# of 2017, all supported ActivePerl and Strawberry Perl are MinGW-built. If +# that changes or an MSVC-built Perl distribution becomes prominent, we can +# revisit this limitation. AC_DEFUN([PGAC_CHECK_PERL_EMBED_CCFLAGS], [AC_REQUIRE([PGAC_PATH_PERL]) AC_MSG_CHECKING([for CFLAGS recommended by Perl]) |