-Qunused-parameter and clang (was Re: GHC Port on 9-CURRENT)

Niclas Zeising niclas.zeising at gmail.com
Tue Jun 28 20:06:23 UTC 2011

On 2011-06-28 21:19, Pan Tsu wrote:
> Niclas Zeising <zeising at daemonic.se> writes:
>> Sorry for hijacking this thread, and cross posting.
>> On 2011-06-26 03:07, Gabor PALI wrote:
>>>> With Clang, an error occurs in one of the configure scripts, because
>>>> Clang warns about unused command-line arguments, and the configure
>>>> script assumes that to be a compiler error.  You can deal with this by
>>>> adding -Qunused-parameter to CFLAGS.
>>> Thanks for investigating this.
>> This should probably be made the default, at least for ports when clang
>> is compiled, since the output generated when not using
>> -Qunused-parameter confuses configure scripts, and stops at least
>> FireFox 5 from compiling, that I know of.
> Do you use ccache? Try without.
> For example, the combo confuses libtool

It has nothing to do with cccache. The issue is that clang by default
warns when passed flags (-std= -f -W etc.) that's not used during the
compilation/linking. This can be silenced with -Qunused-arguments, and
if not, it confuses configure scripts that believe this is an error in
the code it uses to test for features.

Niclas Zeising

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