bug#50058: 28.0.5; emacs build fails with undefined reference to malloc_info

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Does musl define some preprocessor macro that we could use to
> condition that function's compilation?

I think musl, on purpose, doesn't define anything to allow us to
identify that we're using it? 

https://wiki.musl-libc.org/faq.html

Or I may be misunderstanding something.

But if that's the case, we have to just test explicitly for malloc_info
in configure.ac...

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