[4.19,43/74] kbuild: initialize CLANG_FLAGS correctly in the top Makefile

Message ID 20190805124939.358044329@linuxfoundation.org
State New
Headers show
Series
  • Untitled series #22388
Related show

Commit Message

reg Kroah-Hartman Aug. 5, 2019, 1:02 p.m.
From: Masahiro Yamada <yamada.masahiro@socionext.com>


commit 5241ab4cf42d3a93b933b55d3d53f43049081fa1 upstream.

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>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


---
 Makefile |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch

--- a/Makefile
+++ b/Makefile
@@ -430,6 +430,7 @@  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 KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
@@ -482,7 +483,7 @@  endif
 
 ifeq ($(cc-name),clang)
 ifneq ($(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)/..)