[all-commits] [llvm/llvm-project] 953ae9: [builtins] Fix CPU feature detection for FreeBSD o...

[Dimitry Andric via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 953ae94149f09ed1bac189b4d2b790de6b98c60e
      https://github.com/llvm/llvm-project/commit/953ae94149f09ed1bac189b4d2b790de6b98c60e
  Author: Dimitry Andric <dimitry at andric.com>
  Date:   2023-12-29 (Fri, 29 Dec 2023)

  Changed paths:
    M compiler-rt/lib/builtins/cpu_model/aarch64.c

  Log Message:
  -----------
  [builtins] Fix CPU feature detection for FreeBSD on AArch64 (#76532)

 [builtins] Fix CPU feature detection for FreeBSD on AArch64

This is a follow-up to #75635 which broke the build for FreeBSD on
AArch64:

```
compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/freebsd.inc:3:16: error: call to undeclared function 'elf_aux_info'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    3 |   int result = elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
      |                ^
```

Using `elf_aux_info()` requires including `<sys/auxv.h>` first. To
prevent redeclaration issues with `hwcap.inc` attempting to define
`HWCAP_xxx` macros before `<sys/auxv.h>` does so, include `<sys/auxv.h>`
before any of the `.inc` files on FreeBSD.