On Mon, 11 Aug 2025, Jeremy Drake via Cygwin-apps wrote:
> clang and lld require the matching version of llvm to build against. The
> named libllvm20.1 package for the library itself is nice for runtime, but
> how do I ensure that scallywag pulls in the correct libllvm-devel (and
> libpolly-devel), especially while they are still test versions?
It seems like scallywag accepts BUILD_REQUIRES with package=version
format, but only if the version is the full "${PVR}" format (I first used
"${PV}" and that didn't work). It seems like cygport isn't as happy with
that, it warns that the packages are not installed even if they are.
I did see a "testpackages" scallywag token, but that would install *all*
test packages, not just the ones it needs (so would link against a newer
cygwin dll for instance).
Also, is there a version constraint for binary package dependencies? I
had to explicitly add a BUILD_REQUIRES to lld for llvm=${PVR} due to the
libllvm_devel_REQUIRES having just llvm in it, and that pulled in llvm 8
instead of llvm 20. Obviously, libllvm_devel 20 requires llvm 20, not
llvm 8.
