In particular, we should apply the `-undefined` behavior to all
such symbols, include those that are specified via the command line
(i.e. `-e`, `-u`, and `-exported_symbol`). ld64 supports this too.
Reviewed By: #lld-macho, thakis
Differential Revision: https://reviews.llvm.org/D102143
It doesn't make sense to take just the base filename for archives when we emit
the full path for object files. (LLD-ELF emits the full path too.)
This will also make it easier to write a proper test for {D100147}.
Reviewed By: #lld-macho, oontvoo
Differential Revision: https://reviews.llvm.org/D100357
Since we emit diagnostics for undefineds in Writer::scanRelocations()
and symbols referenced by -u flags aren't referenced by any relocations,
this needs some manual code (similar to the entry point).
Differential Revision: https://reviews.llvm.org/D94371
Jez Ng