[llvm-dev] ThinLTO and linkonce_odr + unnamed_addr

[Rafael Avila de Espindola via llvm-dev]

Steven Wu <stevenwu at apple.com> writes:

> Add Rafael here. Because he basically ask me the same question in my commit.
>
> I wonder why clang choose to do unnamed_addr instead of just do visibility hidden. If linkonce_odr + unnamed_addr is just hidden, is the only difference linkonce_odr + unnamed_addr not in the symbol table?

A local symbol being in the symbol table is mostly an implementation
detail.

Not marking a linkonce_odr + *global* unnamed_addr hidden is a missing
optimization on non-MachO.

Cheers,
Rafael