Patch set updated for coreboot: buildgcc: Never set GMP CFLAGS manually in order to get the right flags

[Paul Kocialkowski]

Paul Kocialkowski ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15452

-gerrit

commit 557a74533c8c77d8dd881b0e937500e1668c6c0f
Author: Paul Kocialkowski 
Date:   Fri Jun 17 21:41:00 2016 -0700

buildgcc: Never set GMP CFLAGS manually in order to get the right flags

When no CFLAGS are explicitly provided to it, the GMP configure script
    will figure out the best optimization flags to use on its own. In
    particular, it will setup the march, mfpu and mtune flags based on
    hardware detection.

However, when CFLAGS are provided, they are used as-is and such
    detection doesn't happen. When the march, mfpu and mtune flags are not
    provided (which happens when GMP wasn't built already), not only will
    related optimizations be disabled, but some code might not build because
    of missing support. This happens with NEON instructions on ARMv7 hosts.

Thus, it is better not to set CFLAGS and leave it up to the GMP
    configure script to get them right and still reuse those later.

Change-Id: I6ffcbac1298523d1b8ddf29a8bca1b00298828a7
    Signed-off-by: Paul Kocialkowski 
---
 util/crossgcc/buildgcc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index 3791cc9..92764b2 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -440,8 +440,7 @@ set_hostcflags_from_gmp() {
 }

build_GMP() {
-	CC="$CC" CFLAGS="$HOSTCFLAGS" \
-		../${GMP_DIR}/configure --disable-shared --enable-fat \
+	CC="$CC" ../${GMP_DIR}/configure --disable-shared --enable-fat \
    	--prefix=$TARGETDIR $OPTIONS \
    	|| touch .failed
    $MAKE $JOBS || touch .failed