powerpc: avoid -mno-sched-epilog on GCC 4.9 and newer

npiggin · mpe · commit 6977f95e63b9 · 2018-09-19T22:01:56.000+10:00
Signed-off-by: Nicholas Piggin &lt;npiggin@gmail.com&gt;
Reviewed-by: Joel Stanley &lt;joel@jms.id.au&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
@@ -165,8 +165,12 @@ CC_FLAGS_FTRACE := -pg
 ifdef CONFIG_MPROFILE_KERNEL
 CC_FLAGS_FTRACE += -mprofile-kernel
 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_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
