cmd/link: ELF external linking puts all symbols in dynamic symbol table #53579
Description
Currently external linking on ELF systems passes -rdynamic to the external linker, which tells it to put all exported symbols into the dynamic symbol table. This is unnecessary in the normal case. It wastes space in the executable, and effectively disables garbage collection in the external linker. We should instead only export symbols that may need to be exported.
I have a patch for this which we can try for the 1.20 release.