[cfe-dev] Passing Arguments to Back-End

[Justin Holewinski]

On Wed, Sep 14, 2011 at 2:42 PM, Eli Friedman <eli.friedman at gmail.com>wrote:

> On Wed, Sep 14, 2011 at 11:30 AM, Justin Holewinski
> <justin.holewinski at gmail.com> wrote:
> > On Wed, Sep 14, 2011 at 12:31 PM, Arnaud Allard de Grandmaison
> > <Arnaud.AllardDeGrandMaison at dibcom.com> wrote:
> >>
> >> Hi Justin
> >>
> >>
> >>
> >> You can try the clang’s hidden ‘-llvm’ switch like this :  ‘-llvm
> >> –mcpu=mycpu’ to pass options to the backend. I do not know for top of
> tree,
> >> but this works fine with llvm-2.9.
> >
> > Unfortunately, that does not work, at least not with ToT:
> > $ clang -ccc-host-triple ptx32 test1.c -S -O1 -mllvm -mattr=double
> > clang (LLVM option parsing): Unknown command line argument
> '-mattr=double'.
> >  Try: 'clang (LLVM option parsing) -help'
> > clang (LLVM option parsing): Did you mean '-stats=double'?
> > For reference, what I want to replace is:
> > $ clang -ccc-host-triple ptx32 test1.c -S -O1 -emit-llvm && llc
> > -mattr=double test1.s -o test1.ptx
>
> Try "-Xclang -target-feature -Xclang +double".
>

This seems to be on the right track, but now I'm getting another error:

$ clang -ccc-host-triple ptx32 test1.c -S -O1 -Xclang -target-feature
-Xclang sm20
error: invalid target feature 'double'

Does this just not work yet for non-native targets?


> -Eli
>



-- 

Thanks,

Justin Holewinski
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