Disable excessive FP optimization by recent versions of gcc.

adunstan · adunstan · commit 517462faf0af · 2011-12-14T17:13:01.000-05:00
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.
diff --git a/configure b/configure
@@ -4199,6 +4199,57 @@ sed 's/^/| /' conftest.$ac_ext >&5
 $as_echo "no" >&6; }
 fi
 
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+  # Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
+  { $as_echo "$as_me:$LINENO: checking if $CC supports -fexcess-precision=standard" >&5
+$as_echo_n "checking if $CC supports -fexcess-precision=standard... " >&6; }
+pgac_save_CFLAGS=$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.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  { $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	CFLAGS="$pgac_save_CFLAGS"
+                    { $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 elif test "$ICC" = yes; then
diff --git a/configure.in b/configure.in
@@ -433,6 +433,8 @@ if test "$GCC" = yes -a "$ICC" = no; then
   PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
   # Disable optimizations that assume no overflow; needed for gcc 4.3+
   PGAC_PROG_CC_CFLAGS_OPT([-fwrapv])
+  # Disable FP optimizations that cause various errors on gcc 4.5+ or maybe 4.6+
+  PGAC_PROG_CC_CFLAGS_OPT([-fexcess-precision=standard])
 elif test "$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.
