[clang] [llvm] [libclang][Cygwin] Provide unversioned DLL file alongside versioned one (PR #147132)

[Tomohiro Kashiwada via llvm-commits]

kikairoya wrote:

> I tested this and it broke things for me. This turns cygLLVM-20.dll into a symlink, this doesn't work with existing binaries because DLLs in the import table can't follow the Cygwin symlinks (they're loaded by the Windows loader). It looks like for new binaries it does end up linking to cygLLVM-20.1.dll which is the actual file.

Thank you for testing.
Then, cygLLVM-20.dll must be a regular file.
Other DLLs should also provide a regular file without minor version. I think existing binaries will be broken at every minor version up of LLVM.

> Also, I may have screwed something up, but I'm not getting the libclang symlink in the install (only in the build dir).

Oops. I'll retry.


https://github.com/llvm/llvm-project/pull/147132