[libc-commits] [libc] [llvm] [libc][math] Refactor log10, log1p, log2 implementation to header-only in src/__support/math folder. (PR #176089)

[Nico Weber via libc-commits]

nico wrote:

> All done, except for the gcc12.2 bits. I'll try if I can get that from homebrew 

It doesn't Just Work, at least:

```
% brew install gcc at 12
==> Installing gcc at 12
==> Patching
==> Applying gcc-12.4.0.diff
==> Applying e300c1337a48cf772b09e7136601fd7f9f09d6f1..99533d94172ed7a24c0e54c4ea97e6ae2260409e.patch
==> ../configure --prefix=/Users/thakis/src/homebrew/opt/gcc at 12 --libdir=/Users/thakis/src/homebrew/opt/
==> make
Last 15 lines from /Users/thakis/Library/Logs/Homebrew/gcc at 12/02.make.log:
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:639:26: error: '_Alignof' was not declared in this scope
  639 | } __attribute__((aligned(_Alignof(unsigned int))));
      |                          ^~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:645:35: error: expected primary-expression before 'unsigned'
  645 | } __attribute__((aligned(_Alignof(unsigned int))));
      |                                   ^~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include/mach/arm/_structs.h:645:26: error: '_Alignof' was not declared in this scope
  645 | } __attribute__((aligned(_Alignof(unsigned int))));
      |                          ^~~~~~~~
make[5]: *** [aarch64-apple-darwin24/bits/stdc++.h.gch/O2ggnu++0x.gch] Error 1
make[4]: *** [all-recursive] Error 1
make[3]: *** [all] Error 2
make[2]: *** [all-stage1-target-libstdc++-v3] Error 2
make[1]: *** [stage1-bubble] Error 2
make: *** [all] Error 2
```

I guess I'll try building it from source myself.

https://github.com/llvm/llvm-project/pull/176089