[flang-commits] [clang] [flang] [clang][driver] Special care for linker flags in config files (PR #117573)

[Fangrui Song via flang-commits]

MaskRay wrote:

It's worth spending more time discussing the metacharacter.

`^` can be interpreted as `^` in regex, which means the beginning. `$`, on the other side, suggests the end.

In CCC_OVERRIDE_OPTIONS (clang/lib/Driver/Driver.cpp), `^` is to add an option at the beginning, but there is no `$`. There is `+`, whose meaning is slightly different.

https://github.com/llvm/llvm-project/pull/117573