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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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41
configure.in
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@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $Header: /cvsroot/pgsql/configure.in,v 1.297 2003/10/22 04:16:39 pgsql Exp $
dnl $Header: /cvsroot/pgsql/configure.in,v 1.298 2003/10/25 15:32:11 petere Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@ -203,7 +203,7 @@ AC_SUBST(enable_rpath)
# Spinlocks
#
PGAC_ARG_BOOL(enable, spinlocks, yes,
[ --disable-spinlocks do not use Spinlocks])
[ --disable-spinlocks do not use spinlocks])
#
# --enable-debug adds -g to compiler flags
@ -229,39 +229,42 @@ esac
AC_PROG_CC([$pgac_cc_list])
pgac_CFLAGS_before_template=$CFLAGS
#
# Read the template
#
. "$srcdir/src/template/$template" || exit
# The template may have supplied a default setting for CFLAGS.
# Override this if CFLAGS was set in the original environment.
# CFLAGS are selected so:
# If the user specifies something in the environment, that is used.
# else: If the template file set something, that is used.
# else: If the compiler is GCC, then we use -O2.
# else: If the compiler is something else, then we use -0.
if test "$ac_env_CFLAGS_set" = set; then
CFLAGS=$ac_env_CFLAGS_value
elif test "$pgac_CFLAGS_before_template" != "$CFLAGS"; then
: # (keep what template set)
elif test "$GCC" = yes; then
CFLAGS="-O2"
else
# autoconf already set the default CFLAGS for gcc to be -O2, but we
# need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
if test "$GCC" = yes; then
CFLAGS="$CFLAGS -fno-strict-aliasing"
fi
CFLAGS="-O"
fi
# Need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
PGAC_PROG_CC_NO_STRICT_ALIASING
# supply -g if --enable-debug
if test "$enable_debug" = yes -a "$ac_cv_prog_cc_g" = yes; then
CFLAGS="$CFLAGS -g"
fi
# default to -O rather than empty CFLAGS; this path will not be taken for
# gcc (since autoconf supplies -O2), nor if --enable-debug (because -O -g
# doesn't work on most non-gcc compilers), nor if the template provided
# some CFLAGS.
if test "$ac_env_CFLAGS_set" != set -a x"$CFLAGS" = x""; then
CFLAGS="-O"
fi
AC_MSG_NOTICE([using CFLAGS=$CFLAGS])
# We already have this in Makefile.win32, but configure needs it too
if test "$PORTNAME" = "win32"
then
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
if test "$PORTNAME" = "win32"; then
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
fi
# Check if the compiler still works with the template settings