re PR debug/41065 (DW_TAG_enumeration_type+DW_TAG_enumerator is sometimes missing)

Fix PR debug/41065

gcc/ChangeLog:
	PR debug/41065
	* function.h (types_used_by_vars_hash): Declare new hash table.
	(types_used_by_vars_eq, types_used_by_var_decl_insert): Declare
	equality and hash function for the hash table.
	(types_used_by_cur_var_decl): Declare a new global chained list.
	(types_used_by_var_decl_insert): Declare new function.
	* function.c (types_used_by_vars_hash): Define the hashtable ...
	(types_used_by_vars_eq, types_used_by_vars_do_hash): ... as well as
	its equality and hash functions.
	(hash_types_used_by_vars_entry): New hash helper.
	(types_used_by_cur_var_decl): Define the global chained list.
	(used_types_insert): Update the list of types used by the global
	variable being parsed.
	(types_used_by_var_decl_insert): Define new function.
	* c-common.h (record_types_used_by_current_var_decl): Declare ...
	* c-common.c (record_types_used_by_current_var_decl): ... new
	function.
	* c-decl.c (finish_decl): Record the types used by the global
	variable declaration we've just parsed.
	* dwarf2out.c (premark_used_types): Insert a new line between
	comment and function.
	(premark_used_types_helper): Fix comment.
	(premark_types_used_by_global_vars_helper,
	premark_types_used_by_global_vars): New functions.
	(prune_unused_types): Do not prune types used by global variables.

gcc/cp/ChangeLog:
	PR debug/41065
	* decl.c (cp_finish_decl): Record the types used by the global
	variable declaration we've just parsed.

gcc/testsuite/ChangeLog:
	PR debug/41065
	* gcc.dg/debug/dwarf2/global-used-types.c: New test.

From-SVN: r152085

1 files changed, 22 insertions, 0 deletions

diff --git a/gcc/function.h b/gcc/function.h
index 72aad00..4825d16 100644
--- a/gcc/function.h
+++ b/gcc/function.h
@@ -622,6 +622,28 @@ extern int virtuals_instantiated;
 /* Nonzero if at least one trampoline has been created.  */
 extern int trampolines_created;
 
+struct GTY(()) types_used_by_vars_entry {
+  tree type;
+  tree var_decl;
+};
+
+/* Hash table making the relationship between a global variable
+   and the types it references in its initializer. The key of the
+   entry is a referenced type, and the value is the DECL of the global
+   variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
+   the hash and equality functions to use for this hash table.  */
+extern GTY((param_is (struct types_used_by_vars_entry))) htab_t
+  types_used_by_vars_hash;
+
+hashval_t types_used_by_vars_do_hash (const void*);
+int types_used_by_vars_eq (const void *, const void *);
+void types_used_by_var_decl_insert (tree type, tree var_decl);
+
+/* During parsing of a global variable, this linked list points to
+   the list of types referenced by the global variable.  */
+extern GTY(()) tree types_used_by_cur_var_decl;
+
+
 /* cfun shouldn't be set directly; use one of these functions instead.  */
 extern void set_cfun (struct function *new_cfun);
 extern void push_cfun (struct function *new_cfun);