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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: NR <nroycea+gnu <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: Llvm & Musl Libc - "function-like macro '__GNUC_PREREQ' is not
 defined"
Date: Sun, 11 May 2025 10:18:17 -0500

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
```

Message #8 received at 78376 <at> debbugs.gnu.org (full text, mbox):

From: Collin Funk <collin.funk1 <at> gmail.com>
To: NR <nroycea+gnu <at> gmail.com>
Cc: 78376 <at> debbugs.gnu.org
Subject: Re: bug#78376: Llvm & Musl Libc - "function-like macro
 '__GNUC_PREREQ' is not defined"
Date: Sun, 11 May 2025 10:01:25 -0700

[Message part 1 (text/plain, inline)]

Hi,

NR <nroycea+gnu <at> 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 (text/x-patch, attachment)]

Message #13 received at 78376-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Collin Funk <collin.funk1 <at> gmail.com>
Cc: 78376-done <at> debbugs.gnu.org, NR <nroycea+gnu <at> gmail.com>
Subject: Re: bug#78376: Llvm & Musl Libc - "function-like macro
 '__GNUC_PREREQ' is not defined"
Date: Sun, 11 May 2025 10:22:16 -0700

Thanks, I pushed that patch into coreutils master on Savannah. Closing 
the bug report.

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