uweigand wrote:
> * However, if I removed the check for COMPILER_RT_HAS_FLOAT16 in the source
> files, it builds. Not sure why/if that is needed there (there is no check for
> it in e.g. extendhfdf2.c), or how it could be set.
This is set if the host compiler used to build compiler-rt supports the
`_Float16` type, see this in `compiler-rt/lib/builtins/CMakeLists.txt`:
```
check_c_source_compiles("_Float16 foo(_Float16 x) { return x; }
int main(void) { return 0; }"
COMPILER_RT_HAS_${arch}_FLOAT16)
```
If this is not set, you need to figure out why it is not using the correct host
compiler. I think it should be using the clang built from the same sources,
which *should* now support `_Float16` - if it doesn't, this may cause other
problems, potentially even explaining the wrong results you're seeing.
https://github.com/llvm/llvm-project/pull/109164
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