bug#78376: Llvm & Musl Libc - "function-like macro '__GNUC_PREREQ' is not defined"

[Collin Funk]

Hi,

NR <nroycea+gnu@gmail.com> writes:

> I was aiming to build a llvm/musl-based system, and while something
> like `bash` will build fine, I encountered this error attempting to
> build coreutils:
> ```
> In file included from lib/fts.c:53:
> lib/fts_.h:70:32: error: function-like macro '__GNUC_PREREQ' is not defined
>    70 | #   if defined __cplusplus && (__GNUC_PREREQ (2,8) ||
> __clang_major__ >= 4)
> ```
> Looking in the llvm source, the closest grep result I could find was:
> ```
> llvm_project/llvm/include/llvm/Support/Compiler.h:/// Extend the
> default __GNUC_PREREQ even if glibc's features.h isn't
> ```

Thanks for the report. I could not reproduce this on the Musl system I
have access too, but it is clearly due to a recent commit of mine in
Gnulib.

I don't have commit privileges to Coreutils so you can run 'git am' on
the attached patch. Or wait until a Coreutils maintainer does the same
and pushes the change.

Collin

0001-build-update-gnulib-submodule-to-latest.patch
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