c++: Fix greater-than operator in braced-init-lists [PR123456]

[Eczbek]

From 0210a1a410cfafd79521e15cd96682ed3d5b4943 Mon Sep 17 00:00:00 2001
From: Eczbek <eczbek.v...@gmail.com>
Date: Thu, 5 Jun 2025 14:27:48 -0400
Subject: [PATCH] c++: [PR116928]
        PR c++/116928

gcc/cp/ChangeLog:

        * parser.cc (cp_parser_braced_list):

gcc/testsuite/ChangeLog:

        * g++.dg/parse/template32.C: New test.

c++: Fix greater-than operator in braced-init-lists [PR116928]
---
 gcc/cp/parser.cc                        | 4 ++++
 gcc/testsuite/g++.dg/parse/template32.C | 4 ++++
 2 files changed, 8 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/parse/template32.C

diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 86337635f48..8cfb981fe4f 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -26942,6 +26942,10 @@ cp_parser_braced_list (cp_parser *parser, bool 
*non_constant_p /*=nullptr*/)
   location_t start_loc = cp_lexer_peek_token (parser->lexer)->location;
   auto oas = make_temp_override (parser->omp_array_section_p, false);

+  /* Within a brace-enclosed initializer list, a `>' token is always the
+     greater-than operator.  */
+  auto gto = make_temp_override (parser->greater_than_is_operator_p, true);
+
   /* Consume the `{' token.  */
   matching_braces braces;
   bool found_opening_brace = braces.require_open (parser);
diff --git a/gcc/testsuite/g++.dg/parse/template32.C 
b/gcc/testsuite/g++.dg/parse/template32.C
new file mode 100644
index 00000000000..8229e9f5f53
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/template32.C
@@ -0,0 +1,4 @@
+// PR c++/116928
+// { dg-do compile { target c++11 } }
+
+template<int = { 0 > 0 }> struct A;
--
2.49.0