diff options
Diffstat (limited to 'config/c-compiler.m4')
| -rw-r--r-- | config/c-compiler.m4 | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index 5171e1e6d97..f02243ded0c 100644 --- a/config/c-compiler.m4 +++ b/config/c-compiler.m4 @@ -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 |