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Disable excessive FP optimization by recent versions of gcc.

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Suggested solution from Tom Lane. Problem discovered, probably not
for the first time, while testing the mingw-w64 32 bit compiler.

Backpatched to all live branches.
This commit is contained in:
Andrew Dunstan 2011-12-14 17:05:12 -05:00
parent fa1369a6b9
commit 91a1e14899
2 changed files with 56 additions and 0 deletions
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54
configure vendored
View File

@ -3134,6 +3134,60 @@ else
echo "$as_me: failed program was:" >&5 echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5 sed 's/^/| /' conftest.$ac_ext >&5
CFLAGS="$pgac_save_CFLAGS"
echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6
fi
rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
echo "$as_me:$LINENO: checking if $CC supports -fexcess-precision=standard" >&5
echo $ECHO_N "checking if $CC supports -fexcess-precision=standard... $ECHO_C" >&6
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -fexcess-precision=standard"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
(eval $ac_compile) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest.$ac_objext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
CFLAGS="$pgac_save_CFLAGS" CFLAGS="$pgac_save_CFLAGS"
echo "$as_me:$LINENO: result: no" >&5 echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6 echo "${ECHO_T}no" >&6

2
configure.in
View File

@ -292,6 +292,8 @@ choke me
PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing]) PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
# Disable optimizations that assume no overflow; needed for gcc 4.3+ # Disable optimizations that assume no overflow; needed for gcc 4.3+
PGAC_PROG_CC_CFLAGS_OPT([-fwrapv]) PGAC_PROG_CC_CFLAGS_OPT([-fwrapv])
# Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
elif test x"${CC}" = x"xlc"; then elif test x"${CC}" = x"xlc"; then
# AIX xlc has to have strict aliasing turned off too # AIX xlc has to have strict aliasing turned off too
PGAC_PROG_CC_CFLAGS_OPT([-qnoansialias]) PGAC_PROG_CC_CFLAGS_OPT([-qnoansialias])