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crossdev: Support the combination of LLVM and glibc#26

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vadorovsky wants to merge 4 commits intogentoo:masterfrom
vadorovsky:llvm-gnu
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crossdev: Support the combination of LLVM and glibc#26
vadorovsky wants to merge 4 commits intogentoo:masterfrom
vadorovsky:llvm-gnu

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@vadorovsky
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Such combination is possible if GCC is used as a fallback compiler for building glibc. Building glibc with LLVM is not yet supported. Therefore, this change makes crossdev aware of such combination and installs GCC before glibc.

Depends on:

Include llvm-libunwind and libcxx in the LLVM-based cross environments,
so they are fully ready to build any package.

Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
That's what sys-apps/baselayout does for all systems, with and without
multilib.

Not doing so breaks behavior of several packages, including
sys-libs/libcxx.

Signed-off-by: Michal Rostecki <vadorovsky@protonmail.com>
Add a workflow which sets up and tests crossdev for the given list of
targets.
Such combination is possible if GCC is used as a fallback compiler for
building glibc. Building glibc with LLVM is not yet supported.
Therefore, this change makes crossdev aware of such combination and
installs GCC before glibc.
@vadorovsky
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I don't have time to wrap it up at least now, closing

@vadorovsky vadorovsky closed this Sep 11, 2025
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