[cfe-dev] [clang][main] Does not detect embed gcc toolchain

[David Blaikie via cfe-dev]

Ray - I think you've been doing some work related to toolchain
discovery stuff recently, might this be related?

On Thu, Apr 8, 2021 at 6:25 AM Andi-Bogdan Postelnicu via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
>
> Hello,
>
> I’m building clang main, revision b785e03612d76145c58cb31b6fd6911a5e41e8e3,  and I’m adding to lib folder gcc toolchain 7.4.0, so the folder layout is:
>
> clang/lib/gcc/x86_64-unknown-linux-gnu/7.4.0
>
> Unfortunately when I want to build on linux debian and I do a verbose build clang doesn’t seem able to find the gcc version that I’ve shipped it with:
>
> clang version 13.0.0 (E4V8ZoJsR3qTRv_zx8MEpA)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/someuser/clang/clang/bin
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
> Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
> Candidate multilib: .;@m64
> Selected multilib: .;@m64
>
> Doing the same thing but building the official clang 11.0.1 I’m seeing normal results:
>
> clang version 11.0.1 (NZ4C_ZaZTQmrQM25NeOO0Q)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/someuser/mozilla/clang/clang-11/clang/bin
> Found candidate GCC installation: /home/someuser/clang/clang-11/clang/bin/../lib/gcc/x86_64-unknown-linux-gnu/7.4.0
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
> Selected GCC installation: /home/someuser/clang/clang-11/clang/bin/../lib/gcc/x86_64-unknown-linux-gnu/7.4.0
> Candidate multilib: .;@m64
> Candidate multilib: 32;@m32
> Selected multilib: .;@m64
>
> Has anyone confronted with this lately?
>
> Many thanks
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