[PATCH] Fix libgfortran on darwin, hpux and cygwin (PR libfortran/24991)

[Andreas Tobler]

Jakub Jelinek wrote:
> Hi!
> 
> Turns out that in libstdc++-v3, some targets are explicitely defining
> _GLIBCXX_GTHREAD_USE_WEAK to 0.  This patch does the same.
> 
> It would be good if weakref support gets fixed for darwin, but if darwin
> has pthread_* not in a separate library, there is no point in using weakref
> on that platform.
> 
> Can anyone test it on darwin, please?  I have tested this on x86_64-linux.

With the follow up patch which fixes libgfortran ftell/fgetc/fputs/ttynam:

http://gcc.gnu.org/ml/gcc-testresults/2005-11/msg01253.html

Andreas