gcc: backport patch affecting Linux kernel builds

A long-standing bug in gcc turns out to cause problems with unpatched
Linux versions due to improved optimization enabled by gcc 4.9.  The
upstream fix missed the gcc-4.9.1 cut-off.  It's also been applied
upstream to the 4.8 branch so is being added for OE's 4.8 as well.

(From OE-Core rev: 06f911894a367f395139c2b0d6c2ba6371398478)

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-4.8.inc

@@ -72,6 +72,7 @@ SRC_URI = "\
     file://0048-PR58854_fix_arm_apcs_epilogue.patch \
     file://0049-Enable-SPE-AltiVec-generation-on-powepc-linux-target.patch \
     file://0050-PR-target-58595.patch \
+    file://0052-PR-rtl-optimization-61801.patch \
 "
 SRC_URI[md5sum] = "a3d7d63b9cb6b6ea049469a0c4a43c9d"
 SRC_URI[sha256sum] = "09dc2276c73424bbbfda1dbddc62bbbf900c9f185acf7f3e1d773ce2d7e3cdc8"

meta/recipes-devtools/gcc/gcc-4.8/0052-PR-rtl-optimization-61801.patch

@@ -0,0 +1,36 @@
+From 8dfe30973ab03f0480f1e249f320e78f210dc230 Mon Sep 17 00:00:00 2001
+From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Thu, 17 Jul 2014 07:49:44 +0000
+Subject: [PATCH] 2014-07-17  Richard Biener  <rguenther@suse.de>
+
+	PR rtl-optimization/61801
+	* sched-deps.c (sched_analyze_2): For ASM_OPERANDS and
+	ASM_INPUT don't set reg_pending_barrier if it appears in a
+	debug-insn.
+
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch@212740 138bc75d-0d04-0410-961f-82ee72b054a4
+
+Upstream-Status: Backport [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801]
+Signed-off-by: Peter A. Bigot <pab@pabigot.com>
+
+---
+ gcc/sched-deps.c | 3 ++-
+
+diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c
+index 07857f2..4ac2542 100644
+--- a/gcc/sched-deps.c
++++ b/gcc/sched-deps.c
+@@ -2744,7 +2744,8 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
+ 	   Consider for instance a volatile asm that changes the fpu rounding
+ 	   mode.  An insn should not be moved across this even if it only uses
+ 	   pseudo-regs because it might give an incorrectly rounded result.  */
+-	if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
++	if ((code != ASM_OPERANDS || MEM_VOLATILE_P (x))
++	    && !DEBUG_INSN_P (insn))
+ 	  reg_pending_barrier = TRUE_BARRIER;
+ 
+ 	/* For all ASM_OPERANDS, we must traverse the vector of input operands.
+-- 
+1.8.5.5
+

meta/recipes-devtools/gcc/gcc-4.9.inc

@@ -69,6 +69,7 @@ SRC_URI = "\
     file://0051-eabispe.patch \
     file://0053-gcc-fix-segfault-from-calling-free-on-non-malloc-d-a.patch \
     file://0054-gcc-Makefile.in-fix-parallel-building-failure.patch \
+    file://0055-PR-rtl-optimization-61801.patch \
 "
 SRC_URI[md5sum] = "fddf71348546af523353bd43d34919c1"
 SRC_URI[sha256sum] = "d334781a124ada6f38e63b545e2a3b8c2183049515a1abab6d513f109f1d717e"

meta/recipes-devtools/gcc/gcc-4.9/0055-PR-rtl-optimization-61801.patch

@@ -0,0 +1,36 @@
+From 556537c4ad0df4cbebb74197bb2bdea75cf5dd35 Mon Sep 17 00:00:00 2001
+From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Thu, 17 Jul 2014 07:48:49 +0000
+Subject: [PATCH] 2014-07-17  Richard Biener  <rguenther@suse.de>
+
+	PR rtl-optimization/61801
+	* sched-deps.c (sched_analyze_2): For ASM_OPERANDS and
+	ASM_INPUT don't set reg_pending_barrier if it appears in a
+	debug-insn.
+
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@212739 138bc75d-0d04-0410-961f-82ee72b054a4
+
+Upstream-Status: Backport [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801]
+Signed-off-by: Peter A. Bigot <pab@pabigot.com>
+
+---
+ gcc/sched-deps.c | 3 ++-
+
+diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c
+index efc4223..df29bd3 100644
+--- a/gcc/sched-deps.c
++++ b/gcc/sched-deps.c
+@@ -2750,7 +2750,8 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
+ 	   Consider for instance a volatile asm that changes the fpu rounding
+ 	   mode.  An insn should not be moved across this even if it only uses
+ 	   pseudo-regs because it might give an incorrectly rounded result.  */
+-	if (code != ASM_OPERANDS || MEM_VOLATILE_P (x))
++	if ((code != ASM_OPERANDS || MEM_VOLATILE_P (x))
++	    && !DEBUG_INSN_P (insn))
+ 	  reg_pending_barrier = TRUE_BARRIER;
+ 
+ 	/* For all ASM_OPERANDS, we must traverse the vector of input operands.
+-- 
+1.8.5.5
+