bug#36882: Qemu 4.2.0 build for x86_64-linux fails

[Marius Bakke]

Ludovic Courtès <address@hidden> writes:

> Hi!
>
> Mathieu Othacehe <address@hidden> skribis:
>
>>> Yup, turned out patching GCC was too difficult. I'm experimenting a
>>> filter over inputs passed to set-path-environment-variable in set-paths.
>>
>> This is also quite tricky, because the "libc" input passed to set-paths
>> must not be removed from C_INCLUDE_PATH in (gnu packages commencement)
>> for mes packages.
>
> Yeah, fiddling with ‘set-paths’ sounds like opening a can of worms.
>
>> So, maybe the best option is to patch QEMU directly, as proposed in
>> the attached patch. WDYT?
>
> I’m all in favor of that for now.  It’s likely that QEMU is the only
> package having problems, as Marius noted (the GHC error sounds like it
> could be something different), so I’d say go for the package-specific
> solution for now.

Indeed, I will push Mathieus commit shortly.

clang-runtime requires a similar fix for CPLUS_INCLUDE_PATH.  No idea
what's up with GHC@8.4 yet, but unsurprisingly removing libc from the
include paths does not make a difference.

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