linux-kernel - Re: Conflict between sparse and commit cafa0010cd51f ("Raise the minimum required gcc version to 4.6")

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Message-ID: <9409138a-dc14-2b12-edc0-cfa0b471da6e@c-s.fr>
Date:   Mon, 10 Sep 2018 13:19:07 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>, joe@...ches.com,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-sparse@...r.kernel.org, sparse@...isli.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: Conflict between sparse and commit cafa0010cd51f ("Raise the
 minimum required gcc version to 4.6")



On 09/10/2018 11:34 AM, Luc Van Oostenryck wrote:
> 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 ...

Not yet ...

[root@...6082vm linux-powerpc]# export REAL_CC=ppc-linux-gcc
[root@...6082vm linux-powerpc]# make CHECK="CHECK=sparse cgcc 
-target=ppc -D_CALL_ELF=2 -D__GNUC__=5 -D__GNUC_MINOR__=4" C=2 
arch/powerpc/kernel/process.o
   CALL    scripts/checksyscalls.sh
   CHECK   scripts/mod/empty.c
<command-line>:0:0: warning: "__STDC__" redefined
<built-in>: note: this is the location of the previous definition
/opt/cldk-1.4.0/lib/gcc/ppc-linux/5.4.0/../../../../ppc-linux/lib/crt1.o:(.rodata+0x4): 
undefined reference to `main'
collect2: error: ld returned 1 exit status
make[2]: *** [scripts/mod/empty.o] Error 1
make[1]: *** [scripts/mod] Error 2
make: *** [scripts] Error 2

Christophe

> 
> It's a bit kludgy, I admit.
> 
> -- Luc
>