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Date:   Mon, 10 Sep 2018 13:34:49 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To:     Christophe Leroy <christophe.leroy@c-s.fr>
Cc:     Nick Desaulniers <ndesaulniers@google.com>, joe@perches.com,
        Kees Cook <keescook@chromium.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-sparse@vger.kernel.org, sparse@chrisli.org,
        linuxppc-dev@lists.ozlabs.org
Subject: Re: Conflict between sparse and commit cafa0010cd51f ("Raise the
 minimum required gcc version to 4.6")
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On Mon, Sep 10, 2018 at 09:56:33AM +0000, Christophe Leroy wrote:
> 
> # export REAL_CC=ppc-linux-gcc
> # make CHECK="cgcc -target=ppc -D_CALL_ELF=2 -D__GCC__=5
> -D__GCC_MINOR__=4" C=2 arch/powerpc/kernel/process.o
> scripts/kconfig/conf  --syncconfig Kconfig
> #
> # configuration written to .config
> #
>   UPD     include/config/kernel.release
>   UPD     include/generated/utsrelease.h
>   CC      kernel/bounds.s
>   CC      arch/powerpc/kernel/asm-offsets.s
>   CALL    scripts/checksyscalls.sh
>   CHECK   scripts/mod/empty.c
> Can't exec "/bin/sh": Argument list too long at /usr/local/bin/cgcc line 86.
> make[2]: *** [scripts/mod/empty.o] Error 1
> make[1]: *** [scripts/mod] Error 2
> make: *** [scripts] Error 2

OK. Clearly nobody has ever used it so :(
There is an infinite loop because cgcc use the env var CHECK
to call sparse while kbuild use CHECK to call cgcc here.

The following seems to work here.
$ export REAL_CC=ppc-linux-gcc
$ make CHECK="CHECK=sparse cgcc -target=ppc ...

It's a bit kludgy, I admit.

-- Luc