Re: [PATCH] x86: LLVMLinux: Wrap -mno-80387 with cc-option

[Behan Webster]

On 04/21/14 23:05, Ingo Molnar wrote:
> * behanw@xxxxxxxxxxxxxxxxxx <behanw@xxxxxxxxxxxxxxxxxx> wrote:
>
> > From: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
> >
> > Wrap -mno-80387 gcc options with cc-option so they don't break clang.
> >
> > Signed-off-by: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
> > ---
> >   arch/x86/Makefile | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> > index d1b7c37..ce6ad7e 100644
> > --- a/arch/x86/Makefile
> > +++ b/arch/x86/Makefile
> > @@ -83,7 +83,9 @@ else
> >           KBUILD_CFLAGS += -m64
> >   
> >           # Don't autogenerate traditional x87, MMX or SSE instructions
> > -        KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-80387 -mno-fp-ret-in-387
> > +        KBUILD_CFLAGS += -mno-mmx -mno-sse
> > +        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
> > +        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
> Is there a clang equivalent option that inhibits all things FPU opcode
> generation by the compiler?
Not that I've found yet. Still investigating.

> That's the general purpose of -no-80387.
Yes, I understand what this is trying to accomplish. At this point I'd 
just like this new code not to break the use of clang with v3.15.

I will submit another patch which adds similar functionality when 
compiled with clang once I have that answer.

Behan

--
Behan Webster
behanw@xxxxxxxxxxxxxxxxxx

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