Re: Report: compil error on OSX for target=i386

[Yves Blusseau]

Le 1 sept. 09 à 13:46, Robert Millan a écrit :

> On Mon, Aug 31, 2009 at 11:10:17PM +0200, Yves Blusseau wrote:
> > > > What about following compromise:
> > > > diff --git a/loader/i386/linux.c b/loader/i386/linux.c
> > > > index 4144384..1380eb8 100644
> > > > --- a/loader/i386/linux.c
> > > > +++ b/loader/i386/linux.c
> > > > @@ -543,7 +543,8 @@ grub_linux_boot (void)
> > > >  asm volatile ("lgdt %0" : : "m" (gdt_desc));
> > > >
> > > >  /* Enter Linux.  */
> > > > -  asm volatile ("jmp *%2" : : "b" (0), "S" (real_mode_mem), "g"
> > > > (params->code32_start));
> > > > +  asm volatile ("xorl %%ebx, %%ebx\n"
> > > > +                     "jmp *%1" : : "S" (real_mode_mem), "g"
> > > > (params->code32_start));
> > > >
> > > > #endif
> > > Is this compromise acceptable?
> >
> > Compil and work on OSX.
> >
> > Is it ok to commit it ?
>
> Apple is free to cripple the version of GCC they're shipping (we  
> wanted
> them to have this freedom, even if they're unfriendly towards free  
> software).
> I think it's short-sighted, but it's their problem.
>
> However, on our side, I'm not satisfied at all with accomodating to  
> arbitrary
> limitations like this one.  This seems like a slippery slope.  If we  
> do it
> now, what's the next one?
>
> It's much easier to make official GCC a build requirement.  People  
> hacking
> on GRUB source, or distributors (e.g. Fink) should have no problem  
> with a
> dependency on GCC.

So what you can do because currently we can't compil grub on OSX:

gcc-4.2 -Iloader/i386 -I./loader/i386 -I. -I./include -I./include - 
Wall -W  -Wall -W -Wshadow -Wpointer-arith -Wmissing- 
prototypes                  -Wundef -Wstrict-prototypes -g -Os -falign- 
jumps=1 -falign-loops=1 -falign-functions=1 -DAPPLE_CC=1 -fnested- 
functions -m32 -fno-stack-protector -mno-stack-arg-probe -fno-builtin - 
mrtd -mregparm=3 -m32 -MD -c -o linux_mod-loader_i386_linux.o loader/ 
i386/linux.c
loader/i386/linux.c: In function ‘grub_linux_boot’:
loader/i386/linux.c:546: error: can't find a register in class ‘BREG’  
while reloading ‘asm’
loader/i386/linux.c:542: error: ‘asm’ operand has impossible constraints
loader/i386/linux.c:543: error: ‘asm’ operand has impossible constraints
loader/i386/linux.c:546: error: ‘asm’ operand has impossible constraints
make: *** [linux_mod-loader_i386_linux.o] Error 1


Regards,
Yves Blusseau

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