[Bug libstdc++/71135] rl78-elf libstdc++ FTBFS with some multilibs

[yselkowi at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71135

--- Comment #4 from Yaakov Selkowitz <yselkowi at redhat dot com> ---
(In reply to Yaakov Selkowitz from comment #3)
> It seems that #define _GLIBCXX_USE_WEAK_REF 1 would fix this; the question
> is where exactly it should go (config/os/generic/os_defines.h ?) and under
> what conditions.

Sorry, that should be #define _GLIBCXX_USE_WEAK_REF 0 and (due to
--with-newlib) in config/os/newlib/os_defines.h (which is already defined
inside an ifdef __CYGWIN__ block).