linux-kernel - Re: [PATCH v2 3/4] arm64: vdso32: suppress error message for 'make mrproper'

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Date:   Tue, 19 Oct 2021 17:50:09 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Lucas Henneman <henneman@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH v2 3/4] arm64: vdso32: suppress error message for 'make
 mrproper'

On Tue, Oct 19, 2021 at 03:36:45PM -0700, Nick Desaulniers wrote:
> When running the following command without arm-linux-gnueabi-gcc in
> one's $PATH, the following warning is observed:
> 
> $ ARCH=arm64 CROSS_COMPILE_COMPAT=arm-linux-gnueabi- make -j72 LLVM=1 mrproper
> make[1]: arm-linux-gnueabi-gcc: No such file or directory
> 
> This is because KCONFIG is not run for mrproper, so CONFIG_CC_IS_CLANG
> is not set, and we end up eagerly evaluating various variables that try
> to invoke CC_COMPAT.
> 
> This is a similar problem to what was observed in
> commit dc960bfeedb0 ("h8300: suppress error messages for 'make clean'")
> 
> Reported-by: Lucas Henneman <henneman@...gle.com>
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>
Tested-by: Nathan Chancellor <nathan@...nel.org>

> ---
> Changes v1 -> v2:
> * Change to suppressing via redirecting stderr to /dev/null, as per
>   Masahiro.
> * Add Masahiro's SB tag.
> * Cite dc960bfeedb0.
> 
>  arch/arm64/kernel/vdso32/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
> index 1407516e041e..e478cebb9891 100644
> --- a/arch/arm64/kernel/vdso32/Makefile
> +++ b/arch/arm64/kernel/vdso32/Makefile
> @@ -38,7 +38,8 @@ cc32-disable-warning = $(call try-run,\
>  # As a result we set our own flags here.
>  
>  # KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
> -VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include)
> +VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -nostdinc
> +VDSO_CPPFLAGS += -isystem $(shell $(CC_COMPAT) -print-file-name=include 2>/dev/null)
>  VDSO_CPPFLAGS += $(LINUXINCLUDE)
>  
>  # Common C and assembly flags
> -- 
> 2.33.0.1079.g6e70778dc9-goog
> 
>