https://github.com/TobiHartmann/valhalla/runs/1207837175

d:/a/valhalla/valhalla/jdk/src/hotspot/share/oops/accessBackend.cpp(204): error C2908: explicit specialization; 'void AccessInternal::arraycopy_conjoint_atomic<void>(T *,T *,size_t)' has already been instantiated
        with
        [
            T=void
        ]
make[3]: *** [lib/CompileJvm.gmk:143: /cygdrive/d/a/valhalla/valhalla/jdk/build/windows-x64/hotspot/variant-server/libjvm/objs/accessBackend.obj] Error 1
make[2]: *** [make/Main.gmk:259: hotspot-server-libs] Error 2
make[2]: *** Waiting for unfinished jobs....

ERROR: Build failed for target 'default (product-bundles test-bundles)' in configuration 'windows-x64' (exit code 2)