Subject: [PATCH 1/9] powerpc: avoid -mno-sched-epilog on GCC 4.9 and newer

From: Nicholas Piggin <[email-masked]>
Date: Fri, 14 Sep 2018 15:08:54 +1000

commit 6977f95e63b9b3fb4a5973481a800dd9f48a1338 upstream.

Signed-off-by: Nicholas Piggin <[email-masked]>
Reviewed-by: Joel Stanley <[email-masked]>
Signed-off-by: Michael Ellerman <[email-masked]>
[nc: Adjust context due to lack of f2910f0e6835 and 2a056f58fd33]
Signed-off-by: Nathan Chancellor <[email-masked]>
---
 arch/powerpc/Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 1381693a4a51..7452e50f4d1f 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -236,7 +236,12 @@ endif
 
 # Work around a gcc code-gen bug with -fno-omit-frame-pointer.
 ifeq ($(CONFIG_FUNCTION_TRACER),y)
-KBUILD_CFLAGS		+= -mno-sched-epilog
+# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
+ifneq ($(cc-name),clang)
+KBUILD_CFLAGS		+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
+endif
 endif
 
 cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
-- 
2.20.1