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Adjust configure so that it sets CFLAGS properly for Intel's icc

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even if the compiler is not defining __GNUC__.  Per report from
Dirk Tilger that it is possible for icc to not do that.
This commit is contained in:
Tom Lane
2007-08-05 15:43:00 +00:00
parent c8b7e811f3
commit df9ea6a1f1
2 changed files with 115 additions and 65 deletions
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39
configure.in
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@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $PostgreSQL: pgsql/configure.in,v 1.522 2007/07/19 17:15:30 tgl Exp $
dnl $PostgreSQL: pgsql/configure.in,v 1.523 2007/08/05 15:43:00 tgl Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@ -243,6 +243,13 @@ esac
AC_PROG_CC([$pgac_cc_list])
# Check if it's Intel's compiler, which (usually) pretends to be gcc,
# but has idiosyncrasies of its own. We assume icc will define
# __INTEL_COMPILER regardless of CFLAGS.
AC_TRY_COMPILE([], [@%:@ifndef __INTEL_COMPILER
choke me
@%:@endif], [ICC=[yes]], [ICC=[no]])
unset CFLAGS
#
@ -271,29 +278,21 @@ fi
# Some versions of GCC support some additional useful warning flags.
# Check whether they are supported, and add them to CFLAGS if so.
if test "$GCC" = yes; then
# ICC pretends to be GCC but it's lying; it doesn't support these options.
# So we have to check if "GCC" is really ICC.
AC_TRY_COMPILE([], [@%:@ifndef __INTEL_COMPILER
choke me
@%:@endif], [ICC=[yes]], [ICC=[no]])
if test "$ICC" = no; then
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
else
# Intel compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the
# CFLAGS.
PGAC_PROG_CC_CFLAGS_OPT([-mp1])
fi
if test "$GCC" = yes -a "$ICC" = no; then
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
# These work in some but not all gcc versions
PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
# Disable strict-aliasing rules; needed for gcc 3.3+
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
elif test "$ICC" = yes; then
# Intel's compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
PGAC_PROG_CC_CFLAGS_OPT([-mp1])
# Not clear if this is needed, but seems like a good idea
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
elif test x"${CC}" = x"xlc"; then
# AIX xlc has to have strict aliasing turned off too
PGAC_PROG_CC_CFLAGS_OPT([-qnoansialias])