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

This generates smaller resulting object code when compiled with clang. Signed-off-by: Behan Webster <[email protected]> Signed-off-by: Matthias Kaehlcke <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>
sfionov · Apr 12, 2017 · 6748cb3 · 6748cb3
1 parent c3f0d0b
commit 6748cb3
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/Makefile b/Makefile
@@ -638,7 +638,8 @@ 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,)