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Fix CFLAGS selection to actually work. Add test to detect whether gcc's

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option -fno-strict-aliasing is available.
This commit is contained in:
Peter Eisentraut
2003-10-25 15:32:11 +00:00
parent 6db0a6b035
commit 378f59904a
12 changed files with 144 additions and 53 deletions
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33
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 1.8 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