linux-kernel - Re: [PATCH] parisc: suppress error messages for 'make clean'

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Date:   Fri, 1 May 2020 14:35:18 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] parisc: suppress error messages for 'make clean'

On Sat, Apr 25, 2020 at 2:47 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> 'make ARCH=parisc clean' emits a tons of error messages as follows:
>
>   $ make ARCH=parisc clean
>   gcc: error: unrecognized command line option '-mno-space-regs'
>   gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
>   gcc: error: unrecognized command line option '-mdisable-fpregs'
>   gcc: error: missing argument to '-Wframe-larger-than='
>   gcc: error: unrecognized command line option '-mno-space-regs'
>   gcc: error: unrecognized command line option '-mfast-indirect-calls'; did you mean '-mforce-indirect-call'?
>   gcc: error: unrecognized command line option '-mdisable-fpregs'
>   gcc: error: missing argument to '-Wframe-larger-than='
>     ...
>
> You can supporess them except '-Wframe-larger-than' by setting correct
> CROSS_COMPILE=, but we should not require any compiler for cleaning.
>
> This $(shell ...) is evaluated so many times because LIBGCC is exported.
> Use the ':=' operator to evaluate it just once, and sink the stderr.
>



Applied to linux-kbuild.


> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
>  arch/parisc/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
> index 628cd8bb7ad8..d82787da43cd 100644
> --- a/arch/parisc/Makefile
> +++ b/arch/parisc/Makefile
> @@ -21,7 +21,7 @@ KBUILD_IMAGE := vmlinuz
>
>  NM             = sh $(srctree)/arch/parisc/nm
>  CHECKFLAGS     += -D__hppa__=1
> -LIBGCC         = $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
> +LIBGCC         := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name 2>/dev/null)
>  export LIBGCC
>
>  ifdef CONFIG_64BIT
> --
> 2.25.1
>


-- 
Best Regards
Masahiro Yamada