kbuild: initialize CLANG_FLAGS correctly in the top Makefile

This change “kbuild: initialize CLANG_FLAGS correctly in the top Makefile” (commit 5241ab4) in Linux kernel is authored by Masahiro Yamada <yamada.masahiro [at] socionext.com> on Mon Jul 29 18:15:17 2019 +0900.

Description of "kbuild: initialize CLANG_FLAGS correctly in the top Makefile"

The change “kbuild: initialize CLANG_FLAGS correctly in the top Makefile” introduces changes as follows.

kbuild: initialize CLANG_FLAGS correctly in the top Makefile

CLANG_FLAGS is initialized by the following line:

  CLANG_FLAGS     := --target=$(notdir $(CROSS_COMPILE:%-=%))

..., which is run only when CROSS_COMPILE is set.

Some build targets (bindeb-pkg etc.) recurse to the top Makefile.

When you build the kernel with Clang but without CROSS_COMPILE,
the same compiler flags such as -no-integrated-as are accumulated
into CLANG_FLAGS.

If you run 'make CC=clang' and then 'make CC=clang bindeb-pkg',
Kbuild will recompile everything needlessly due to the build command
change.

Fix this by correctly initializing CLANG_FLAGS.

Fixes: 238bcbc4e07f ("kbuild: consolidate Clang compiler flags")
Cc: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>

Linux kernel releases containing commit 5241ab4

Linux kernel code changes from "kbuild: initialize CLANG_FLAGS correctly in the top Makefile"

There are 3 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
 
diff --git a/Makefile b/Makefile
index fa0fbe7851ea..5ee6f6889869 100644
--- a/Makefile
+++ b/Makefile
@@ -472,6 +472,7 @@ KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
+CLANG_FLAGS :=
 
 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
@@ -519,7 +520,7 @@ endif
 
 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 ifneq ($(CROSS_COMPILE),)
-CLANG_FLAGS	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
+CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
 GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)

The commit for this change in Linux stable tree is 5241ab4 (patch).

Last modified: 2020/02/08