Tested x86_64-pc-linux-gnu, applying to trunk.
Marek, I hope this change doesn't interfere with your work on P2865R5.
-- 8< --
P2865R5 pointed out that we only enabled this warning with -Wall; we should
handle it like other deprecations.
gcc/c-family/ChangeLog:
* c-opts.cc (c_common_post_options): Enable -Warray-compare
in C++20.
gcc/testsuite/ChangeLog:
* g++.dg/tree-ssa/pr15791-1.C: Add -Wno-array-compare.
---
gcc/c-family/c-opts.cc | 5 +++++
gcc/testsuite/g++.dg/tree-ssa/pr15791-1.C | 1 +
2 files changed, 6 insertions(+)
diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index fb9d0875b8e..8b143e78c07 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -1052,6 +1052,11 @@ c_common_post_options (const char **pfilename)
warn_deprecated_literal_operator,
deprecated_in (cxx23));
+ /* -Warray-compare is enabled by default in C++20. */
+ SET_OPTION_IF_UNSET (&global_options, &global_options_set,
+ warn_array_compare,
+ warn_array_compare || deprecated_in (cxx20));
+
/* -Wtemplate-id-cdtor is enabled by default in C++20. */
SET_OPTION_IF_UNSET (&global_options, &global_options_set,
warn_template_id_cdtor,
diff --git a/gcc/testsuite/g++.dg/tree-ssa/pr15791-1.C
b/gcc/testsuite/g++.dg/tree-ssa/pr15791-1.C
index 68f14adad00..9905851ee7c 100644
--- a/gcc/testsuite/g++.dg/tree-ssa/pr15791-1.C
+++ b/gcc/testsuite/g++.dg/tree-ssa/pr15791-1.C
@@ -1,4 +1,5 @@
/* { dg-do link } */
+/* { dg-additional-options -Wno-array-compare } */
void link_error ();
base-commit: 819f67a2f633d2000f09119f0e19b784ea0a4bd8
--
2.47.0
