Re: [PATCH v4 0/3] MR7748: ucrtbase: Add cexp() implementation.

[Bernhard Übelacker (＠bernhardu)]

Bernhard Übelacker (@bernhardu) commented about libs/musl/Makefile.in:
> EXTLIB    = libmusl.a
>  EXTRAINCL = -I$(srcdir)/src/internal -I$(srcdir)/arch/generic
> -EXTRADEFS = -D_ACRTIMP= -D_NO_CRT_MATH_INLINE
> +EXTRADEFS = -D_ACRTIMP= -D_NO_CRT_MATH_INLINE \
> -
>        -fno-builtin

Hello @dlehman25, I noticed the test pattern page shows following tests starting to fail since 2025-05-28:
- [d3dcompiler_42:hlsl_d3d9](https://test.winehq.org/data/patterns.html#d3dcompiler_42:hlsl_d3d9)
- [d3dcompiler_43:hlsl_d3d9](https://test.winehq.org/data/patterns.html#d3dcompiler_43:hlsl_d3d9)
- [d3dcompiler_46:hlsl_d3d9](https://test.winehq.org/data/patterns.html#d3dcompiler_46:hlsl_d3d9)
- [d3dcompiler_47:hlsl_d3d9](https://test.winehq.org/data/patterns.html#d3dcompiler_47:hlsl_d3d9)

A git bisect led me to this merge request containing this commit:
```
15485e6dd9be152286f08b3a3f6cf42895f3b377 is the first broken commit
commit 15485e6dd9be152286f08b3a3f6cf42895f3b377
Author: Daniel Lehman 
Date:   Fri Apr 25 21:45:19 2025 -0700

msvcr120: Add cexp() implementation.
```
(git bisect needed a clean build each time, so ccache helps a lot. Only visible with a GCC-mingw build.)

I tried to further reduce it and think it is related with the addition of `-fno-builtin` to `libs/musl`, can you confirm this finding?