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| author | Peter Eisentraut <peter_e@gmx.net> | 2003-10-25 15:32:11 +0000 |
|---|---|---|
| committer | Peter Eisentraut <peter_e@gmx.net> | 2003-10-25 15:32:11 +0000 |
| commit | 378f59904a8b6c36c25e5ce669633f1fa4491e3c (patch) | |
| tree | 5ebdad148f89ae08e1d5cb74675896bdc186d44e /config | |
| parent | 6db0a6b0352ff4644166f3b257e2e13103b770f9 (diff) | |
| download | postgresql-378f59904a8b6c36c25e5ce669633f1fa4491e3c.tar.gz | |
Fix CFLAGS selection to actually work. Add test to detect whether gcc's
option -fno-strict-aliasing is available.
Diffstat (limited to 'config')
| -rw-r--r-- | config/c-compiler.m4 | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4 index 5d72e1377b..1649b105aa 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 1.8 2003/04/24 21:16:42 tgl Exp $ +# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.9 2003/10/25 15:32:11 petere Exp $ # PGAC_C_SIGNED @@ -97,7 +97,7 @@ AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$1), # PGAC_C_FUNCNAME_SUPPORT -# ------------- +# ----------------------- # Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc). # Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly. AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT], @@ -120,3 +120,32 @@ AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1, [Define to 1 if your compiler understands __FUNCTION__.]) fi fi])# PGAC_C_FUNCNAME_SUPPORT + + +# 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=$pgac_save_CFLAGS +]) + +if test "$ac_env_CFLAGS_set" != set; then + CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing" +fi])# PGAC_PROG_CC_NO_STRICT_ALIASING |