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

[Christophe Leroy]

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@pc16082vm linux-powerpc]# export REAL_CC=ppc-linux-gcc
[root@pc16082vm 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