[cfe-dev] Passing Arguments to Back-End

[Justin Holewinski]

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

****
>
> ** **
>
> Cheers,****
>
> -- ****
>
> **Arnaud de Grandmaison** ****
>   ------------------------------
>
> *From:* cfe-dev-bounces at cs.uiuc.edu [mailto:cfe-dev-bounces at cs.uiuc.edu] *On
> Behalf Of *Justin Holewinski
> *Sent:* Wednesday, September 14, 2011 3:45 PM
> *To:* clang-dev Developers
> *Subject:* [cfe-dev] Passing Arguments to Back-End****
>
> ** **
>
> Using Clang, is there any way to specify -mcpu and -mattr options for the
> back-end?  I am using -ccc-host-triple to force the triple to ptx32--.  I
> have tried -mcpu and -mtarget with Clang, but I just get the "argument
> unused during compilation" warning.****
>
> ** **
>
> For context, my back-end supports -mattr=+double.  I can pass this argument
> to llc.  Is there a command-line option in Clang to pass this along to the
> back-end?  I know I can use -emit-llvm and then invoke llc manually, but I
> would like to let Clang handle this, if possible.
> ****
>
> ** **
>
> -- ****
>
> Thanks,****
>
> ** **
>
> Justin Holewinski****
>
> ** **
>



-- 

Thanks,

Justin Holewinski
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