Mac OSX brew fails with --HEAD

[andymans]

Hi,

macos catalina 10.15.4 (19E266)

The bulk of a brew install --HEAD seems to be working; but it errors towards the end with:

Undefined symbols for architecture x86_64:
"getPollyPluginInfo()", referenced from:
(anonymous namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_deletellvm::raw_pwrite_stream >) in libclangCodeGen.a(BackendUtil.cpp.o)
ld: symbol(s) not found for architecture x86_64

Using brew install sans HEAD (the standard release) works just fine :-)

[andrewrk]

Duplicate of #4799; see that issue for a workaround

[andymans]

Aha OK. Thx! Hadn't seen #4799; closing.