[PATCH] ARC: Override toplevel default -O2 with -O3

[Vineet Gupta]

ARC kernels have historically been built with -O3, despite top level
Makefile defaulting to -O2. This was facilitated by implicitly ordering
of arch makefile include AFTER top level assigned -O2.

An upstream fix to top level a1c48bb160f ("Makefile: Fix unrecognized
cross-compiler command line options") changed the ordering, making ARC
-O3 defunt.

Fix that by NOT relying on any ordering whatsoever and use the right
mechanism to do the over-rides.

Suggested-by: Michal Marek <mmarek@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
 arch/arc/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 86c71b2089d2..c23f3f2b0ff8 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -44,6 +44,7 @@ endif
 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
 # Generic build system uses -O2, we want -O3
 cflags-y  += -O3
+KCFLAGS += -O3
 endif

 # small data is default for elf32 tool-chain. If not usable, disable it
-- 
1.9.1

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