[PATCH v2 2/4] kbuild: LD_DEAD_CODE_DATA_ELIMINATION no -ffunction-sections/-fdata-sections for module build
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2018-05-09 13:00:21
Also in:
linux-kbuild, linuxppc-dev
Subsystem:
kernel build + files below scripts/ (unless maintained elsewhere), the rest · Maintainers:
Nathan Chancellor, Nicolas Schier, Linus Torvalds
Modules do not tend to cope with -ffunction-sections, even though they do not link with -gc-sections. It may be possible for unused symbols to be trimmed from modules, but in general that would take much more work in architecture module linker scripts. For now, enable these only for kernel build. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index 619a85ad716b..9dcbfb353f81 100644
--- a/Makefile
+++ b/Makefile@@ -799,8 +799,8 @@ KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) endif ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION -KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,) -KBUILD_CFLAGS += $(call cc-option,-fdata-sections,) +KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,) +KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,) endif # arch Makefile may override CC so keep this after arch Makefile is included
--
2.17.0