[cfe-dev] -cc1 and -m64 incompatible?

[Zhanyong Wan (λx.x x)]

Thanks for the quick replay, Doug.

2010/1/19 Douglas Gregor <dgregor at apple.com>:
>
> On Jan 19, 2010, at 3:29 PM, Zhanyong Wan (λx.x x) wrote:
>
>> Hi,
>>
>> This command works:
>>
>>  $ clang -cc1 t.cc
>>
>> So does this:
>>
>>  $ clang -m64 t.cc
>>
>> However, it doesn't work when both -cc1 and -m64 are specified:
>>
>>  $ clang -cc1 -m64 t.cc
>>  error: unknown argument: '-m64'
>>  $ clang -m64 -cc1 t.cc
>>  gcc: unrecognized option '-cc1'
>>  gcc: unrecognized option '-cc1'
>>
>> Is this expected?  How do I run the front-end in 64-bit mode?
>
> If you need to use -cc1 (which is very much an implementation detail), pass it the appropriate triple with -triple foo-bar-baz. Check out what the driver passes for the triple with, e.g.,
>
>        clang -m64 t.cc -###
>
>
>> Also, neither -cc1 nor -m64 is mentioned in 'clang --help' or
>> http://clang.llvm.org/docs/UsersManual.html.
>
> -cc1 is an implementation detail, so it shouldn't be part of the user manual. -m64, on the other hand, should be mentioned somewhere.

So should we remove -cc1 from http://clang.llvm.org/get_started.html ?

>
>>  Is there a definitive
>> guide on clang's command line flags?  Many thanks,
>
>
> Just the source. We'd love to enhance the source to contain documentation strings, so that we could automatically generate a reference manual for Clang's command-line flags... but nobody's done the work.

Got it.  Thanks!

>
>        - Doug



-- 
Zhanyong