* rtl.h (force_line_numbers, restore_line_number_status): Declare.

	* emit-rtl.c (force_line_numbers, restore_line_number_status):
	New functions.
	* stmt.c (struct nesting): Replace seenlabel with line_number_status.
	(expand_start_case): Adjust to this change.
	(check_seenlabel): New function.
	(pushcase, pushcase_range, expand_endcase): Use it.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@18031 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 22 insertions, 0 deletions

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 739ca53fde1..3da217ced04 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -3457,3 +3457,25 @@ init_emit_once (line_numbers)
   pic_offset_table_rtx = gen_rtx_REG (Pmode, PIC_OFFSET_TABLE_REGNUM);
 #endif
 }
+
+/* Query and clear/ restore no_line_numbers.  This is used by the
+   switch / case handling in stmt.c to give proper line numbers in
+   warnings about unreachable code.  */
+
+int
+force_line_numbers ()
+{
+  int old = no_line_numbers;
+
+  no_line_numbers = 0;
+  if (old)
+    force_next_line_note ();
+  return old;
+}
+
+void
+restore_line_number_status (old_value)
+     int old_value;
+{
+  no_line_numbers = old_value;
+}