Re: [PATCH] kbuild: initialize CLANG_FLAGS correctly in the top Makefile

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On Mon, Jul 29, 2019 at 06:15:17PM +0900, Masahiro Yamada wrote:
> 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@xxxxxxxxxxxxxxx> # v4.20+
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>

Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>



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