1 files changed, 14 insertions, 2 deletions
diff --git a/gdb/annotate.h b/gdb/annotate.h
index b45d882dc0e..70c2f280507 100644
--- a/gdb/annotate.h
+++ b/gdb/annotate.h
@@ -92,8 +92,20 @@ struct annotate_arg_emitter
    character position.
 
    MID_STATEMENT is nonzero if the PC is not at the beginning of that
-   line.  */
-extern void annotate_source_line (struct symtab *s, int line,
+   line.
+
+   The current symtab and line is updated to reflect S and LINE.
+
+   Return true if the annotation was printed and the current symtab and
+   line were updated, otherwise return false, which can happen if the
+   source file for S can't be found, or LINE is out of range.
+
+   This does leave GDB in the weird situation where, even when annotations
+   are on, we only sometimes print the annotation, and only sometimes
+   update the current symtab and line.  However, this particular annotation
+   has behaved this way for some time, and front ends that still use
+   annotations now depend on this behaviour.  */
+extern bool annotate_source_line (struct symtab *s, int line,
 				  int mid_statement, CORE_ADDR pc);
 
 extern void annotate_frame_begin (int, struct gdbarch *, CORE_ADDR);