PR fortran/29635
	PR fortran/23057
	* debug.h (struct gcc_debug_hooks): Add NAME and CHILD
	arguments to imported_module_or_decl.
	(debug_nothing_tree_tree): Removed.
	(debug_nothing_tree_tree_tree_bool): New prototype.
	* debug.c (do_nothing_debug_hooks): Adjust.
	(debug_nothing_tree_tree): Removed.
	(debug_nothing_tree_tree_tree_bool): New function.
	* dwarf2out.c (is_symbol_die): Handle DW_TAG_module.
	(gen_variable_die): Put all common vars for the
	same COMMON block under one DW_TAG_common_block.
	(declare_in_namespace): Return new context_die, for Fortran
	return the module DIE instead of adding extra declarations into
	the namespace.
	(gen_type_die_with_usage): Adjust declare_in_namespace caller.
	(gen_namespace_die): If is_fortran (), generate DW_TAG_module
	instead of DW_TAG_namespace.  If DECL_EXTERNAL is set, add
	DW_AT_declaration.
	(dwarf2out_global_decl): Don't skip Fortran global vars.
	(gen_decl_die): Likewise.  Adjust declare_in_namespace callers.
	(dwarf2out_imported_module_or_decl): Add NAME and CHILD arguments.
	If NAME is non-NULL, add DW_AT_name.  If CHILD is non-NULL, put
	DW_TAG_imported_declaration as child of previous
	DW_TAG_imported_module.
	* dbxout.c (dbx_debug_hooks, xcoff_debug_hooks): Adjust.
	* sdbout.c (sdb_debug_hooks): Likewise.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.

	* name-lookup.c (do_using_directive, cp_emit_debug_info_for_using):
	Adjust debug_hooks->imported_module_or_decl callers.

	* f95-lang.c (gfc_init_ts): New function.
	(LANG_HOOKS_INIT_TS): Define.
	* gfortran.h (gfc_use_rename): New type, moved from module.c.
	(gfc_get_use_rename): New macro, moved from module.c.
	(gfc_use_list): New type.
	(gfc_get_use_list): New macro.
	(gfc_namespace): Add use_stmts field.
	(gfc_free_use_stmts): New prototype.
	* Make-lang.in (fortran/trans-decl.o): Depend on debug.h.
	* module.c (gfc_use_rename, gfc_get_use_rename): Moved to
	gfortran.h.
	(gfc_use_module): Chain the USE statement info to
	ns->use_stmts.
	(gfc_free_use_stmts): New function.
	* symbol.c (gfc_free_namespace): Call gfc_free_use_stmts.
	* trans.h (struct module_htab_entry): New type.
	(gfc_find_module, gfc_module_add_decl): New functions.
	* trans.c (gfc_generate_module_code): Create NAMESPACE_DECL for
	the module, adjust DECL_CONTEXTs of module procedures and
	call gfc_module_add_decl for them.
	* trans-common.c (build_common_decl): Set DECL_IGNORED_P
	on the common variable.
	(create_common): Set DECL_IGNORED_P for use associated vars.
	* trans-decl.c: Include debug.h.
	(gfc_get_symbol_decl): Set DECL_IGNORED_P on use_assoc vars from
	modules.
	(build_function_decl): Allow current_function_decl's context
	to be a NAMESPACE_DECL.
	(module_htab, cur_module): New variables.
	(module_htab_do_hash, module_htab_eq, module_htab_decls_hash,
	module_htab_decls_eq, gfc_find_module, gfc_module_add_decl): New
	functions.
	(gfc_create_module_variable): Adjust DECL_CONTEXTs of module
	variables and types and call gfc_module_add_decl for them.
	(gfc_generate_module_vars): Temporarily set cur_module.
	(gfc_trans_use_stmts): New function.
	(gfc_generate_function_code): Call it.
	(gfc_generate_block_data): Set DECL_IGNORED_P on decl.
	* trans-types.c (gfc_get_derived_type): Adjust DECL_CONTEXT
	and TYPE_CONTEXT of module derived types.

From-SVN: r139773