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[builtins] Fix CPU feature detection for FreeBSD on AArch64 (#76532)

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[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.
This commit is contained in:
Dimitry Andric 2023-12-29 11:13:40 +01:00 committed by GitHub
parent 450be89136
commit 953ae94149
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compiler-rt/lib/builtins/cpu_model/aarch64.c
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@ -34,6 +34,9 @@ _Bool __aarch64_have_lse_atomics
__attribute__((visibility("hidden"), nocommon)) = false;
#if defined(__FreeBSD__)
// clang-format off: should not reorder sys/auxv.h alphabetically
#include <sys/auxv.h>
// clang-format on
#include "aarch64/hwcap.inc"
#include "aarch64/lse_atomics/freebsd.inc"
#elif defined(__Fuchsia__)