No way of specifing a rpath so custom Frameworks aren't linkable

[schmitch]

Hello, currently we use some Frameworks inside of mac which are inside the /Library/Frameworks folder, however in cargo there is no way of setting this @rpath so that the Framework gets found.

[alexcrichton]

Yeah currently Cargo doesn't allow passing flags like -C rpath, but build scripts can specify framework search paths and frameworks to the compiler via rustc-link-{lib,search}. I believe we have other bugs about passing extra flags to rustc, so I'm going to close this in favor of those, thanks for the report though!