From 6977f95e63b9b3fb4a5973481a800dd9f48a1338 Mon Sep 17 00:00:00 2001
From: Nicholas Piggin <npiggin@gmail.com>
Date: Fri, 14 Sep 2018 15:08:54 +1000
Subject: [PATCH] powerpc: avoid -mno-sched-epilog on GCC 4.9 and newer

References: bsc#1065729
Patch-mainline: v4.20-rc1
Git-commit: 6977f95e63b9b3fb4a5973481a800dd9f48a1338

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 arch/powerpc/Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -156,8 +156,12 @@ CC_FLAGS_FTRACE += -mprofile-kernel
         CC_FLAGS_FTRACE := -mprofile-kernel-not-supported
     endif
 endif
-# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
-CC_FLAGS_FTRACE	+= -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)
+CC_FLAGS_FTRACE	+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
+endif
 endif
 
 CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)