re PR fortran/89943 (Submodule functions are not allowed to have C binding)

re PR fortran/89943 (Submodule functions are not allowed to have C binding)

2019-10-14  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/89943
	decl.c (gfc_match_function_decl): Ignore duplicate BIND(C) for function
	declaration in submodule.  Implement at check for F2018 C1550.
	(gfc_match_entry): Use temporary for locus, which allows removal of
	one gfc_error_now().
	(gfc_match_subroutine): Ignore duplicate BIND(C) for subroutine
	declaration in submodule.  Implement at check for F2018 C1550.

2019-10-14  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/89943
	* gfortran.dg/pr89943_1.f90: New test.
	* gfortran.dg/pr89943_2.f90: Ditto.
	* gfortran.dg/pr89943_3.f90: Ditto.
	* gfortran.dg/pr89943_4.f90: Ditto.

From-SVN: r276983