[Bug c++/87380] Explicit instantations should use weak symbols on darwin

[mrs at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87380

--- Comment #14 from mrs at gcc dot gnu.org <mrs at gcc dot gnu.org> ---
You can test it if you can dump the ar symbol table, with a assembled .s file. 
Nothing needs to work except the assembler and ar and the tool to dump the
symbol table.  In the olden days, there was no entry for the weak symbol.  I
was wondering around trying to recall which tool dumps the ar symbol table, no
well; it seems like I used to know how to dump it, but haven't in years.