Add support for per-location warning groups.

gcc/ChangeLog:

	* Makefile.in (OBJS-libcommon): Add diagnostic-spec.o.
	* gengtype.c (open_base_files): Add diagnostic-spec.h.
	* diagnostic-spec.c: New file.
	* diagnostic-spec.h: New file.
	* tree.h (no_warning, all_warnings, suppress_warning_at): New
	declarations.
	* warning-control.cc: New file.

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/tree.h b/gcc/tree.h
index 060ddee..e5d1718 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -21,6 +21,7 @@ along with GCC; see the file COPYING3.  If not see
 #define GCC_TREE_H
 
 #include "tree-core.h"
+#include "options.h"
 
 /* Convert a target-independent built-in function code to a combined_fn.  */
 
@@ -6441,4 +6442,15 @@ public:
   operator location_t () const { return m_combined_loc; }
 };
 
+/* Code that doesn't refer to any warning.  Has no effect on suppression
+   functions.  */
+constexpr opt_code no_warning = opt_code ();
+/* Wildcard code that refers to all warnings.  */
+constexpr opt_code all_warnings = N_OPTS;
+
+/* Set the disposition for a warning (or all warnings by default)
+   at a location to disabled by default.  */
+extern bool suppress_warning_at (location_t, opt_code = all_warnings,
+				 bool = true);
+
 #endif  /* GCC_TREE_H  */