mstorsjo wrote:
FWIW, I see that this was reverted already, but for the future: This produced
warnings when building for i386 - reproducible like this:
```c++
#if __has_cpp_attribute(clang::preserve_none)
#define PRESERVE_NONE [[clang::preserve_none]]
#else
#define PRESERVE_NONE
#endif
PRESERVE_NONE void func(void) {
}
```
```console
$ clang -target i686-linux-gnu -c preserve-none.cpp
preserve-none.cpp:7:1: warning: 'clang::preserve_none' calling convention is not
supported for this target [-Wignored-attributes]
7 | PRESERVE_NONE void func(void) {
| ^
preserve-none.cpp:2:25: note: expanded from macro 'PRESERVE_NONE'
2 | #define PRESERVE_NONE [[clang::preserve_none]]
| ^
1 warning generated.
```
This warning seems to be produced for any `i386` target.
https://github.com/llvm/llvm-project/pull/173756
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