[flang-commits] [clang] [flang] [flang][driver] Add support for -isysroot in the frontend (PR #77365)

[Kelvin Li via flang-commits]

kkwli wrote:

If the compiler is built with `DEFAULT_SYSROOT`, the `-isysroot` option is ignored. Is that the expected behavior? My local MacOS build (with `-DDEFAULT_SYSROOT="$(xcrun --show-sdk-path)"`) has `isysroot.f90` failed.

https://github.com/llvm/llvm-project/pull/77365