[PATCH v20 4/4] c: Add -Wpedantic diagnostic for _Countof

[Alejandro Colomar]

It is not supported in <= C23 mode.

gcc/c/ChangeLog:

        * c-parser.cc (c_parser_sizeof_or_countof_expression):
        Add -Wpedantic diagnostic for _Countof in <= C23 mode.

Signed-off-by: Alejandro Colomar <a...@kernel.org>
---
 gcc/c/c-parser.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc
index 87700339394..d2193ad2f34 100644
--- a/gcc/c/c-parser.cc
+++ b/gcc/c/c-parser.cc
@@ -10637,6 +10637,10 @@ c_parser_sizeof_or_countof_expression (c_parser 
*parser, enum rid rid)
 
   start = c_parser_peek_token (parser)->location;
 
+  if (rid == RID_COUNTOF)
+    pedwarn_c23 (start, OPT_Wpedantic,
+                "ISO C does not support %qs before C23", op_name);
+
   c_parser_consume_token (parser);
   c_inhibit_evaluation_warnings++;
   if (rid == RID_COUNTOF)
-- 
2.49.0