## Summary In commit d6d76a7affdd3dc7a3f0713d821d4f7a618d7511 changes where introduced to throw an exception(?) if certain optional tools where not found. On windows this results in a large amount of confusing output printing messages like: `x86_64-unknown-mingw32-llc-22 not found in search path` `llvm-dlltool-22 not found in search path` And there are hundreds of them. Further the logic of the check seems dubious. I *have* llvm-dlltool installed but on msys it's installed as just `llvm-dlltool`. ``` $ which llvm-dlltool.exe /clang64/bin/llvm-dlltool.exe ``` I'm not very familiar with the exact logic involved but I think the best thing would be to: * At least on windows also check for the non-versioned name on path. llvm-dlltool doesn't support a --version argument, but assuming it's from the llvm package we can use `opt --version` from path as standin. But we need to check they are from the same package. * One message per tool for `tool-X` not found if it can't be found at all. * This message should probably include the versions checked for. @DavidEichmann as you implemented the commit in question. ## Environment * GHC version used: HEAD Optional: * Operating System: Win