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Date: Tue, 15 Sep 2015 05:19:48 +0200 From: Sedat Dilek <sedat.dilek@...il.com> To: Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Sedat Dilek <sedat.dilek@...il.com>, Behan Webster <behanw@...verseincode.com> Subject: [PATCH] kbuild: llvmlinux: Set appropriate compiler-flag for CONFIG_CC_OPTIMIZE_FOR_SIZE 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@...verseincode.com> --- 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 -- 2.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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