[llvm-dev] RFC: Deprecate config.guess

[Renato Golin via llvm-dev]

On Wed, 15 Sept 2021 at 17:55, Tom Stellard via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I've submitted this patch[3], which turns off config.guess by default
> and tries to determine the host triple using the host compiler.  Given
> all the different combinations for triples, I don't know if there is
> any better way to test this than to turn it off and wait for the bug
> reports.
>

I think this is a good change and one that we should really work on, but
I'm not sure compiler front-ends are a drop-in replacement for all
variations.

Perhaps add the option and make it ON by default for now, which will still
work for all current platforms, and add the possibility of turning guessing
OFF and allowing those that aren't supported by out very old config.guess
version to use the compiler.

Fixing the triple in the front-end isn't really trivial, there are a number
of replacements on the triple until it hits the middle-end, so this may
actually create problems that aren't easy to fix down the line.

Just like moving from automake to CMake, I think we need to do this slowly
and changing buildbots until all are running the new format, then we change
the default behaviour.

cheers,
--renato
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