[Mesa-dev] [PATCH] meson: Allow use of ASM for x86 host with x86_64 build machine

[Dylan Baker]

Quoting Eric Anholt (2018-06-07 14:34:02)
> Dylan Baker <dylan at pnwbakers.com> writes:
> 
> > The reason we restrict the use of ASM when cross compiling is that there
> > is a C based generator (mtypes) that must be run as part of the build
> > process, and it must be built for the host architecture. In the case of
> > an x86 host and an x86_64 build machine this is possible as long as the
> > host and build OSes are the same (ie, not Windows -> Linux).
> >
> > This also makes the commit message a bit more generic than it previously
> > was.
> 
> Given that the igt meson build has been running some of my
> cross-compiled arm binaries under qemu during its build process, I
> actually don't think we need to restrict running matypes compiled for
> the host.

I have a todo about that actually. Really the only cases we need to restrict are
x86 -> x86_64 and !x86* -> x86*; (since only x86* uses gen_matypes). I just
haven't had time to test using an exe_wrapper for that purpose, and meson
doesn't enforce that you have an exe_wrapper, so we still need to disable the
assembly if you don't have one.
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