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Commitdf9ea6a

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committed
Adjust configure so that it sets CFLAGS properly for Intel's icc
even if the compiler is not defining __GNUC__. Per report fromDirk Tilger that it is possible for icc to not do that.
1 parentc8b7e81 commitdf9ea6a

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2 files changed

+96
-46
lines changed

2 files changed

+96
-46
lines changed

‎configure‎

Lines changed: 77 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -2818,6 +2818,58 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
28182818
ac_compiler_gnu=$ac_cv_c_compiler_gnu
28192819

28202820

2821+
# Check if it's Intel's compiler, which (usually) pretends to be gcc,
2822+
# but has idiosyncrasies of its own. We assume icc will define
2823+
# __INTEL_COMPILER regardless of CFLAGS.
2824+
2825+
cat >conftest.$ac_ext <<_ACEOF
2826+
/* confdefs.h. */
2827+
_ACEOF
2828+
cat confdefs.h >>conftest.$ac_ext
2829+
cat >>conftest.$ac_ext <<_ACEOF
2830+
/* end confdefs.h. */
2831+
2832+
int
2833+
main ()
2834+
{
2835+
#ifndef __INTEL_COMPILER
2836+
choke me
2837+
#endif
2838+
;
2839+
return 0;
2840+
}
2841+
_ACEOF
2842+
rm -f conftest.$ac_objext
2843+
if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
2844+
(eval $ac_compile) 2>conftest.er1
2845+
ac_status=$?
2846+
grep -v '^ *+' conftest.er1 >conftest.err
2847+
rm -f conftest.er1
2848+
cat conftest.err >&5
2849+
echo "$as_me:$LINENO: \$? = $ac_status" >&5
2850+
(exit $ac_status); } &&
2851+
{ ac_try='test -z "$ac_c_werror_flag"
2852+
|| test ! -s conftest.err'
2853+
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
2854+
(eval $ac_try) 2>&5
2855+
ac_status=$?
2856+
echo "$as_me:$LINENO: \$? = $ac_status" >&5
2857+
(exit $ac_status); }; } &&
2858+
{ ac_try='test -s conftest.$ac_objext'
2859+
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
2860+
(eval $ac_try) 2>&5
2861+
ac_status=$?
2862+
echo "$as_me:$LINENO: \$? = $ac_status" >&5
2863+
(exit $ac_status); }; }; then
2864+
ICC=yes
2865+
else
2866+
echo "$as_me: failed program was:" >&5
2867+
sed 's/^/| /' conftest.$ac_ext >&5
2868+
2869+
ICC=no
2870+
fi
2871+
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
2872+
28212873
unset CFLAGS
28222874

28232875
#
@@ -2846,12 +2898,15 @@ fi
28462898

28472899
# Some versions of GCC support some additional useful warning flags.
28482900
# Check whether they are supported, and add them to CFLAGS if so.
2849-
2850-
if test "$GCC" = yes; then
2851-
28522901
# ICC pretends to be GCC but it's lying; it doesn't support these options.
2853-
# So we have to check if "GCC" is really ICC.
28542902

2903+
if test "$GCC" = yes -a "$ICC" = no; then
2904+
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
2905+
# These work in some but not all gcc versions
2906+
echo "$as_me:$LINENO: checking if $CC supports -Wdeclaration-after-statement" >&5
2907+
echo $ECHO_N "checking if $CC supports -Wdeclaration-after-statement... $ECHO_C" >&6
2908+
pgac_save_CFLAGS=$CFLAGS
2909+
CFLAGS="$pgac_save_CFLAGS -Wdeclaration-after-statement"
28552910
cat >conftest.$ac_ext <<_ACEOF
28562911
/* confdefs.h. */
28572912
_ACEOF
@@ -2862,9 +2917,7 @@ cat >>conftest.$ac_ext <<_ACEOF
28622917
int
28632918
main ()
28642919
{
2865-
#ifndef __INTEL_COMPILER
2866-
choke me
2867-
#endif
2920+
28682921
;
28692922
return 0;
28702923
}
@@ -2891,22 +2944,22 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
28912944
ac_status=$?
28922945
echo "$as_me:$LINENO: \$? = $ac_status" >&5
28932946
(exit $ac_status); }; }; then
2894-
ICC=yes
2947+
echo "$as_me:$LINENO: result: yes" >&5
2948+
echo "${ECHO_T}yes" >&6
28952949
else
28962950
echo "$as_me: failed program was:" >&5
28972951
sed 's/^/| /' conftest.$ac_ext >&5
28982952

2899-
ICC=no
2953+
CFLAGS="$pgac_save_CFLAGS"
2954+
echo "$as_me:$LINENO: result: no" >&5
2955+
echo "${ECHO_T}no" >&6
29002956
fi
29012957
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
29022958

2903-
if test "$ICC" = no; then
2904-
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
2905-
2906-
echo "$as_me:$LINENO: checking if $CC supports -Wdeclaration-after-statement" >&5
2907-
echo $ECHO_N "checking if $CC supports -Wdeclaration-after-statement... $ECHO_C" >&6
2959+
echo "$as_me:$LINENO: checking if $CC supports -Wendif-labels" >&5
2960+
echo $ECHO_N "checking if $CC supports -Wendif-labels... $ECHO_C" >&6
29082961
pgac_save_CFLAGS=$CFLAGS
2909-
CFLAGS="$pgac_save_CFLAGS -Wdeclaration-after-statement"
2962+
CFLAGS="$pgac_save_CFLAGS -Wendif-labels"
29102963
cat >conftest.$ac_ext <<_ACEOF
29112964
/* confdefs.h. */
29122965
_ACEOF
@@ -2956,10 +3009,11 @@ echo "${ECHO_T}no" >&6
29563009
fi
29573010
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
29583011

2959-
echo "$as_me:$LINENO: checking if $CC supports -Wendif-labels" >&5
2960-
echo $ECHO_N "checking if $CC supports -Wendif-labels... $ECHO_C" >&6
3012+
# Disable strict-aliasing rules; needed for gcc 3.3+
3013+
echo "$as_me:$LINENO: checking if $CC supports -fno-strict-aliasing" >&5
3014+
echo $ECHO_N "checking if $CC supports -fno-strict-aliasing... $ECHO_C" >&6
29613015
pgac_save_CFLAGS=$CFLAGS
2962-
CFLAGS="$pgac_save_CFLAGS -Wendif-labels"
3016+
CFLAGS="$pgac_save_CFLAGS -fno-strict-aliasing"
29633017
cat >conftest.$ac_ext <<_ACEOF
29643018
/* confdefs.h. */
29653019
_ACEOF
@@ -3009,11 +3063,10 @@ echo "${ECHO_T}no" >&6
30093063
fi
30103064
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
30113065

3012-
else
3013-
# Intel compiler has a bug/misoptimization in checking for
3014-
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the
3015-
# CFLAGS.
3016-
echo "$as_me:$LINENO: checking if $CC supports -mp1" >&5
3066+
elif test "$ICC" = yes; then
3067+
# Intel's compiler has a bug/misoptimization in checking for
3068+
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
3069+
echo "$as_me:$LINENO: checking if $CC supports -mp1" >&5
30173070
echo $ECHO_N "checking if $CC supports -mp1... $ECHO_C" >&6
30183071
pgac_save_CFLAGS=$CFLAGS
30193072
CFLAGS="$pgac_save_CFLAGS -mp1"
@@ -3066,9 +3119,7 @@ echo "${ECHO_T}no" >&6
30663119
fi
30673120
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
30683121

3069-
fi
3070-
3071-
# Disable strict-aliasing rules; needed for gcc 3.3+
3122+
# Not clear if this is needed, but seems like a good idea
30723123
echo "$as_me:$LINENO: checking if $CC supports -fno-strict-aliasing" >&5
30733124
echo $ECHO_N "checking if $CC supports -fno-strict-aliasing... $ECHO_C" >&6
30743125
pgac_save_CFLAGS=$CFLAGS

‎configure.in‎

Lines changed: 19 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $PostgreSQL: pgsql/configure.in,v 1.522 2007/07/19 17:15:30 tgl Exp $
2+
dnl $PostgreSQL: pgsql/configure.in,v 1.523 2007/08/0515:43:00 tgl Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -243,6 +243,13 @@ esac
243243

244244
AC_PROG_CC([$pgac_cc_list])
245245

246+
# Check if it's Intel's compiler, which (usually) pretends to be gcc,
247+
# but has idiosyncrasies of its own. We assume icc will define
248+
# __INTEL_COMPILER regardless of CFLAGS.
249+
AC_TRY_COMPILE([], [@%:@ifndef __INTEL_COMPILER
250+
choke me
251+
@%:@endif], [ICC=[yes]], [ICC=[no]])
252+
246253
unset CFLAGS
247254

248255
#
@@ -271,29 +278,21 @@ fi
271278

272279
# Some versions of GCC support some additional useful warning flags.
273280
# Check whether they are supported, and add them to CFLAGS if so.
274-
275-
if test "$GCC" = yes; then
276-
277281
# ICC pretends to be GCC but it's lying; it doesn't support these options.
278-
# So we have to check if "GCC" is really ICC.
279-
AC_TRY_COMPILE([], [@%:@ifndef __INTEL_COMPILER
280-
choke me
281-
@%:@endif], [ICC=[yes]], [ICC=[no]])
282-
283-
if test "$ICC" = no; then
284-
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
285-
286-
PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
287-
PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
288-
else
289-
# Intel compiler has a bug/misoptimization in checking for
290-
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the
291-
# CFLAGS.
292-
PGAC_PROG_CC_CFLAGS_OPT([-mp1])
293-
fi
294282

283+
if test "$GCC" = yes -a "$ICC" = no; then
284+
CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
285+
# These work in some but not all gcc versions
286+
PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
287+
PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
295288
# Disable strict-aliasing rules; needed for gcc 3.3+
296289
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
290+
elif test "$ICC" = yes; then
291+
# Intel's compiler has a bug/misoptimization in checking for
292+
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.
293+
PGAC_PROG_CC_CFLAGS_OPT([-mp1])
294+
# Not clear if this is needed, but seems like a good idea
295+
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
297296
elif test x"${CC}" = x"xlc"; then
298297
# AIX xlc has to have strict aliasing turned off too
299298
PGAC_PROG_CC_CFLAGS_OPT([-qnoansialias])

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