BUG: unable to build with musl, 'execinfo.h' file not found

[RinCat]

Describe the issue:

Unable to build with musl since 'execinfo.h' not exists.

Reproduce the code example:

N/A

Error message:

INFO: clang: numpy/core/src/multiarray/temp_elide.c
numpy/core/src/multiarray/temp_elide.c:85:10: fatal error: 'execinfo.h' file not found
#include <execinfo.h>
                    ^~~~~~~~~~~~
1 error generated.

### NumPy/Python version information:

1.23

[mattip]

How are we successfully building wheels for musl if this cannot succeed?

[RinCat]

Maybe your system doesn't have a library like libunwind so backtracing is turned off.
I do use clang + musl. This error actually common https://www.google.com/search?q=%27execinfo.h%27+file+not+found+musl

[seberg]

If execinfo is required for backtracing in this case, how come we can just skip the include? Shouldn't some symbol from it be in use at runtime?

[charris]

Shouldn't some symbol from it be in use at runtime?

execinfo also appears in numpy/linalg/umath_linalg.cpp in debug mode, but the import is disabled. @RinCat What distro are you using?

[RinCat]

If execinfo is required for backtracing in this case, how come we can just skip the include? Shouldn't some symbol from it be in use at runtime?

execinfo is not required for other backtracing libraries.

It should have # include <libunwind.h> if LDFLAGS="-unwindlib=libunwind" did not set.
I will try to add a header test.

[RinCat]

Shouldn't some symbol from it be in use at runtime?

execinfo also appears in numpy/linalg/umath_linalg.cpp in debug mode, but the import is disabled. @RinCat What distro are you using?

I am using Gentoo, however it is experimental musl + clang system which not have official images.
If someone wanna try, I can provide a LXD image.

[RinCat]

Here is an example:
https://github.com/htop-dev/htop/blob/f3e70ab389879db5b250bab29f14acb543bfd11f/CRT.c#L29