Other than you changing the commit comment, this *is* my patch.
I haven't upstreamed this patch yet because we are still characterizing
its effects on other architectures.
Clang certainly doesn't require -Oz to be used to be able to boot for
arm nor arm64. So the commit message isn't correct either.
NAK
Behan
On 09/14/15 21:19, Sedat Dilek wrote:
Based on a patch of Behan Webster (see [1]).
CLANG (here: v3.7) requires '-Oz' as OptLevel to be set.
A Linux v4.3-rc1 kernel built fine with CONFIG_CC_OPTIMIZE_FOR_SIZE=y
and boots on bare metal.
This is a Ubuntu/precise AMD64 system.
Tested against Linux v4.3-rc1 and a refreshed llvmlinux patchset.
[1] http://git.linuxfoundation.org/?p=llvmlinux.git;a=blob;f=arch/all/patches/smaller.patch
CC: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
---
Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index 4249441e535d..a57fb6b39ed7 100644
--- a/Makefile
+++ b/Makefile
@@ -622,7 +622,8 @@ KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
endif
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
+KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
else
KBUILD_CFLAGS += -O2
endif
--
Behan Webster
behanw@xxxxxxxxxxxxxxxxxx
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