> > a configure test only proves whether the build machine can deal
> > with the flag, not whether the machine the executables will
> > ultimately run on knows what the flag means.  We cannot assume that
> > the build and execution boxes are the same.  (In general,
> > AC_TRY_RUN tests are best avoided because of this.)
> I understand why that is important in general, but as a shop which
> builds from source, and is fine with a separate build for each
> hardware model / OS version combination, it would be great if any
> optimizations which are only available if you *do* assume that the
> build machine and the run machine are the same (or at lease
> identical) could be enabled with some configure switch.  Maybe
> something like --enable-platform-specific-optimizations.
> I don't know if any such possible optimizations currently exist, I'm
> just saying that if any are identified, it would be nice to have the
> option of using them.

I can't say the right way to go for now, but I'd like binary
packages could enjoy the effect of my patch as far as possible so
that I made lwarx hint test run in configure runtime.

Manabu Ori

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