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[1/7] kbuild: clear LDFLAGS in the top Makefile

Message ID 1521045861-22418-2-git-send-email-yamada.masahiro@socionext.com
State Superseded
Headers show
Series kbuild: various fix, clean-up, improvements of CONFIG_TRIM_UNUSED_KSYMS | expand

Commit Message

Masahiro Yamada March 14, 2018, 4:44 p.m. UTC 
Currently LDFLAGS is not cleared, so same flags are accumulated in
LDFLAGS when the top Makefile is recursively invoked.

I found unneeded rebuild for ARCH=arm64 when CONFIG_TRIM_UNUSED_KSYMS
is enabled.  If include/generated/autoksyms.h is updated, the top
Makefile is recursively invoked, then arch/arm64/Makefile adds one
more '-maarch64linux'.  Due to the command line change, modules are
rebuilt needlessly.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

---

 Makefile | 1 +
 1 file changed, 1 insertion(+)

-- 
2.7.4
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Patch

diff --git a/Makefile b/Makefile
index e02d092..5eb5d9d 100644
--- a/Makefile
+++ b/Makefile
@@ -426,6 +426,7 @@  KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
+LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 
 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC