[cfe-dev] Passing Arguments to Back-End
justin.holewinski at gmail.com
Wed Sep 14 13:55:17 CDT 2011
On Wed, Sep 14, 2011 at 2:54 PM, Justin Holewinski <
justin.holewinski at gmail.com> wrote:
> 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
>> >> 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
>> > 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'
Sorry, bad copy-paste job. Replace sm20 with double. sm20 should also be a
valid option for the back-end.
> Does this just not work yet for non-native targets?
> Justin Holewinski
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