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Do not let external specification of CFLAGS stop us from adding

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-fno-strict-aliasing.
This commit is contained in:
Tom Lane
2004-02-02 04:08:12 +00:00
parent a60442a446
commit 3c373885fa
3 changed files with 103 additions and 2 deletions
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31
config/c-compiler.m4
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@ -1,5 +1,5 @@
# Macros to detect C compiler features
# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.5 2002/03/29 17:32:53 petere Exp $
# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.5.2.1 2004/02/02 04:08:02 tgl Exp $
# PGAC_C_SIGNED
@ -92,3 +92,32 @@ AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$1),
[$AS_TR_SH([pgac_cv_alignof_$1])],
[The alignment requirement of a `$1'])
])# PGAC_CHECK_ALIGNOF
# PGAC_PROG_CC_NO_STRICT_ALIASING
# -------------------------------
# Find out how to turn off strict aliasing in the C compiler.
AC_DEFUN([PGAC_PROG_CC_NO_STRICT_ALIASING],
[AC_CACHE_CHECK([how to turn off strict aliasing in $CC],
pgac_cv_prog_cc_no_strict_aliasing,
[pgac_save_CFLAGS=$CFLAGS
if test "$GCC" = yes; then
pgac_try="-fno-strict-aliasing"
else
# Maybe fill in later...
pgac_try=
fi
for pgac_flag in $pgac_try; do
CFLAGS="$pgac_save_CFLAGS $pgac_flag"
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[pgac_cv_prog_cc_no_strict_aliasing=$pgac_try
break])
done
CFLAGS=$pgac_save_CFLAGS
])
if test x"$pgac_cv_prog_cc_no_strict_aliasing" != x""; then
CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing"
fi])# PGAC_PROG_CC_NO_STRICT_ALIASING