gcc-4.9: backport from gcc trunk r212178

When compiling meta-toolchain-qt5 on cortexa8, the compiler throws an
internal compiler error:

...
qttools-opensource-src-5.3.2/src/linguist/shared/po.cpp:
In function 'bool loadPO(Translator&, QIODevice&, ConversionData&)':
qttools-opensource-src-5.3.2/src/linguist/shared/po.cpp:717:1:
internal compiler error: in add_stores, at var-tracking.c:6000
...

Tracking this down led to https://bugs.linaro.org/show_bug.cgi?id=534
It seems the bug is well know and fixed upstream. So backporting from
trunk seems to be the right solution. This fixes the compiler problem
on cortexa8 and does not seem to be very invasive. The original commit
can be found at:

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@212178 138bc75d-0d04-0410-961f-82ee72b054a4

(From OE-Core rev: 6751ef78694783fb86e55c77afefae750ab1b610)

Signed-off-by: Stefan Müller-Klieser <s.mueller-klieser@phytec.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 40 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-4.9.inc b/meta/recipes-devtools/gcc/gcc-4.9.inc
index 3af87d1cc6..ee31f0b620 100644
--- a/meta/recipes-devtools/gcc/gcc-4.9.inc
+++ b/meta/recipes-devtools/gcc/gcc-4.9.inc
@@ -77,6 +77,7 @@ SRC_URI = "\
     file://0059-gcc-PR-rtl-optimization-63348.patch \
     file://0060-Only-allow-e500-double-in-SPE_SIMD_REGNO_P-registers.patch \
     file://0061-target-gcc-includedir.patch \
+    file://0062-gcc-var-tracking.c-backport-from-gcc-trunk-r212178.patch \
 "
 SRC_URI[md5sum] = "4df8ee253b7f3863ad0b86359cd39c43"
 SRC_URI[sha256sum] = "2020c98295856aa13fda0f2f3a4794490757fc24bcca918d52cc8b4917b972dd"
diff --git a/meta/recipes-devtools/gcc/gcc-4.9/0062-gcc-var-tracking.c-backport-from-gcc-trunk-r212178.patch b/meta/recipes-devtools/gcc/gcc-4.9/0062-gcc-var-tracking.c-backport-from-gcc-trunk-r212178.patch
new file mode 100644
index 0000000000..c0ea62f0ef
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.9/0062-gcc-var-tracking.c-backport-from-gcc-trunk-r212178.patch
@@ -0,0 +1,39 @@
+From b30ffb8097749fdb55704aa7d8307ca1a58255d6 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Stefan=20M=C3=BCller-Klieser?= <s.mueller-klieser@phytec.de>
+Date: Tue, 7 Apr 2015 16:15:11 +0200
+Subject: [PATCH] gcc/var-tracking.c: backport from gcc trunk r212178
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+resolves a bug seen on cortexa8 building qt5 libraries.
+
+2014-06-30  Joseph Myers  <joseph@codesourcery.com>
+
+    * var-tracking.c (add_stores): Return instead of asserting if old
+    and new values for conditional store are the same.
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@212178 138bc75d-0d04-0410-961f-82ee72b054a4
+
+Signed-off-by: Stefan Müller-Klieser <s.mueller-klieser@phytec.de>
+---
+ gcc/var-tracking.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/gcc/var-tracking.c b/gcc/var-tracking.c
+index 65d8285..7c38910 100644
+--- a/gcc/var-tracking.c
++++ b/gcc/var-tracking.c
+@@ -5997,7 +5997,8 @@ add_stores (rtx loc, const_rtx expr, void *cuip)
+     {
+       cselib_val *oval = cselib_lookup (oloc, GET_MODE (oloc), 0, VOIDmode);
+ 
+-      gcc_assert (oval != v);
++      if (oval == v)
++        return;
+       gcc_assert (REG_P (oloc) || MEM_P (oloc));
+ 
+       if (oval && !cselib_preserved_value_p (oval))
+-- 
+1.9.1
+