Commit d438cec0 authored Mar 27, 2017 by Behan Webster Committed by Greg Kroah-Hartman Nov 23, 2018

kbuild: use -Oz instead of -Os when using clang



commit 6748cb3c299de1ffbe56733647b01dbcc398c419 upstream.

This generates smaller resulting object code when compiled with clang.

Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 14635231

Makefile

+2 −1

Original line number	Diff line number	Diff line
		@@ -644,7 +644,8 @@ KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
		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
		ifdef CONFIG_PROFILE_ALL_BRANCHES
		KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)