Compiler for testing a bootstrapped glibc?

[Carlos O'Donell]

On 02/27/2014 02:49 PM, Brooks Moses wrote:
> Glibc folks -
> 
> I've run into a conundrum with testing our bootstrapped-from-scratch
> glibc builds, and I'm curious how other people's processes work.
> 
> Recently, we updated to a version of glibc that can do a single-step
> bootstrap -- and so we now build a static-only GCC with no glibc, and
> then build glibc using that GCC.  This works great -- but then we want
> to run "make check".  And, unfortunately, glibc's testsuite requires
> more than just a static-only GCC.
> 
> There are a couple of solution directions that I've thought of:
> 
> 1) Build a dynamic GCC using the just-built glibc, and install it on
> top of the static-only GCC we used for building.  This is arguably
> simpler, but means rebuilding anything in glibc after testing will get
> different results than before testing.  It also increases the overall
> build-and-test time.
> 
> 2) Test the glibc with a different (pre-existing) compiler instead of
> with the compiler we used to build it.  This is what I'd prefer, but I
> couldn't figure out how to do that without doing evil sed things to
> the generated makefile fragments.
> 
> Is there a good way to test against a different compiler than the
> build compiler?  Or is there a good alternative here that I'm missing?
>  How do other people handle this?

My opinion is that everyone does #1.

Cheers,
Carlos.