[cfe-dev] Passing Arguments to Back-End

[Eli Friedman]

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".

-Eli