Build with GHC 9.4.2 on llvm-15 branch, and adapt to LLVM-15.

[sighingnow]

The "build with GHC 9.4.2" part is the same as #410.

See llvm/llvm-project@962a247 (which is included afterwords LLVM-14) for the jitlink::InProcessMemoryManager API changes.

Tested on windows with MSYS2.

[tmcdonell]

Thanks!

How are you building/testing on windows? Would it be easy to add to the (new) CI? The version of llvm on the runner (via Chocolaty) doesn't include the llvm-config executable so we can't build using that, and I'm not sure where else to get packages on windows.

[tmcdonell]

I made some progress building with msys2, but get undefined symbol errors linking the test executables. Have you encountered this problem before?

Edit: example

[sighingnow]

but get undefined symbol errors linking the test executables. Have you encountered this problem before?

No such error. Actually, I'm working in a very non-standard environment where I remove the bundled MinGW in ghc and mklink /D the $MSYS/clang64 to the ghc/mingw location, and removed all explicit extra-libraries: c++ from my dependencies.

With bundled MinGW, I meet some other linker errors like ld.lld: error: -exclude-symbols:__clang_call_terminate is not allowed in .drectve so I have given up and turns to MSYS's clang64 environment at the very beginning.

[tmcdonell]

Linking seems to work with the clang64 environment, although the tests fail with a (presumably) null pointer dereference. This could be the same reason the tests fail on macOS though, so I think it's actually working now. Thanks!