[PATCH] Fix PR 20766, darwin and constructors

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Darwin (before 8), constructors are done lazy on the load of
the module containing the constructor so the initializer for
libgfortran is not done unless you either call set_args or
use the provided main which calls set_args.  The way to fix
this is just to make libgfortran one module while linking
and this patch fixes that by adding the extra flag of
"-single_module".

OK? Built on powerpc-darwin with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

	* configure.ac (extra_ldflags_libgfortran): Set for *-darwin* to
	"-Wl,-single_module".
	* configure: Regenerate.
	* Makefile.am (libgfortran_la_LDFLAGS): Add extra_ldflags_libgfortran.
	* Makefile.in: Regenerate.

Attachment: fixPR20766.diff.txt
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