linux-kernel - Re: [PATCH] kbuild: dummy-tools: adjust to scripts/cc-version.sh

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Date:   Wed, 10 Mar 2021 05:54:14 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org
Cc:     Jiri Slaby <jirislaby@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: dummy-tools: adjust to scripts/cc-version.sh

On 09. 03. 21, 17:25, Masahiro Yamada wrote:
> Commit aec6c60a01d3 ("kbuild: check the minimum compiler version in
> Kconfig") changed how the script detects the compiler version.
> 
> Get 'make CROSS_COMPILE=scripts/dummy-tools/' back working again.
> 
> Fixes: aec6c60a01d3 ("kbuild: check the minimum compiler version in Kconfig")
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
> 
> Perhaps, Jiri may have already noticed this issue, and have a similar patch.
> I just checked ML, but I did not find a patch to fix this.

No, as I was making it work on 5.11 :).

BTW there is one remaining issue I came across:
config PAHOLE_HAS_SPLIT_BTF
         def_bool $(success, test `$(PAHOLE) --version | sed -E 
's/v([0-9]+)\.([0-9]+)/\1\2/'` -ge "119")

and in Makefile we see:
PAHOLE          = pahole

and not something like:
PAHOLE          = $(CROSS_COMPILE)pahole

Any idea how to fix this?

>   scripts/dummy-tools/gcc | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/dummy-tools/gcc b/scripts/dummy-tools/gcc
> index 7b10332b23ba..39e65fee59bd 100755
> --- a/scripts/dummy-tools/gcc
> +++ b/scripts/dummy-tools/gcc
> @@ -57,9 +57,9 @@ if arg_contain --version "$@"; then
>   fi
>   
>   if arg_contain -E "$@"; then
> -	# For scripts/gcc-version.sh; This emulates GCC 20.0.0
> +	# For scripts/cc-version.sh; This emulates GCC 20.0.0
>   	if arg_contain - "$@"; then
> -		sed 's/^__GNUC__$/20/; s/^__GNUC_MINOR__$/0/; s/^__GNUC_PATCHLEVEL__$/0/'
> +		sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}'
>   		exit 0
>   	else
>   		echo "no input files" >&2
> 


-- 
js
suse labs