Kazunobu Kuriyama wrote:
> Attached is a patch which was made to suppress some compiler warning
> put out by a recent version of clang.
>
> I'm on Mac OS X 10.8.5 and upgraded Xcode from 4.6.x to 5.0 a few days
> ago. With that IDE, a new version of clang came and, when I had it
> compile vim, it was complaining:
>
> clang: warning: argument unused during compilation: '-fno-strength-reduce'
>
> Hmm, it looks like the day is coming when the widely known '-O2
> -fno-strength-reduce' used over a decade finally comes to an end...
> (No?)
>
> Anyway, the patch modifies src/configure.in in such a way that the
> resulting configure script checks the version number of clang in use,
> if it is actually used in the process of configuration, and then
> adjusts CFLAGS accordingly; if the version number is higher enough,
> the optimization flag -fno-strength-reduce is excluded from CFLAGS;
> otherwise, it is left as it was.
>
> After applying the patch, please do 'make autoconf' for yourself. I
> think it would be safer than offering a patch against 'configure'
> itself.
Did clang really support -fno-strength-reduce at some point?
Also, older clang versions are buggy anyway. So perhaps we can just
drop that argument whenever clang is used?
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