[llvm] [flang-rt] Added FLANG_RT_QUADMATH_INCLUDE_DIR option. (PR #130378)

[Slava Zakharin via llvm-commits]

vzakhari wrote:

> Clang is already searching for gcc installations, just doesn't add its include dir to the default header search path.

I do not think it is possible to use both clang's and gcc's include paths in the same clang compilation.  If you try you would get lots of errors due to conflicting header files.

https://github.com/llvm/llvm-project/pull/130378