From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Wed, 12 Mar 2014 04:38:52 +0000 (+0000)
Subject: libgo: Build math package with -ffp-contract=off on non-x86.
X-Git-Tag: releases/gcc-4.9.0~490
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=33a9145bb7229ba592e9a4f7ee9c68399ac5d070;p=thirdparty%2Fgcc.git

libgo: Build math package with -ffp-contract=off on non-x86.

http://golang.org/issue/7074 shows that not using
-ffp-contract=off produces the wrong result for math.Log2(1)
on arm64.

From-SVN: r208505
---

diff --git a/libgo/configure b/libgo/configure
index c55212042c64..f4b8c104465a 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -14985,6 +14985,8 @@ $as_echo "$libgo_cv_c_fancymath" >&6; }
 MATH_FLAG=
 if test "$libgo_cv_c_fancymath" = yes; then
   MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
+else
+  MATH_FLAG="-ffp-contract=off"
 fi
 
 
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 7063e2d162f7..4480261a9c9e 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -620,6 +620,8 @@ CFLAGS=$CFLAGS_hold])
 MATH_FLAG=
 if test "$libgo_cv_c_fancymath" = yes; then
   MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
+else
+  MATH_FLAG="-ffp-contract=off"
 fi
 AC_SUBST(MATH_FLAG)