PR fortran/31629

	PR fortran/31629

	* lang.opt (-fmodule-private): New option.
	* gfortran.h (gfc_option_t): Add flag_module_private member.
	* invoke.texi (-fmodule-private): Document the new option.
	* module.c (gfc_check_access): Allow the -fmodule-private option
	to modify the default behaviour.
	* options.c (gfc_init_options): Initialize flag_module_private.
	(gfc_handle_option): Handle -fmodule-private.

	* gfortran.dg/module_private_1.f90: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@127381 138bc75d-0d04-0410-961f-82ee72b054a4