[PATCH] assert-h: suppress Apple clang 13 false alarms

[Paul Eggert]

* m4/assert_h.m4 (gl_ASSERT_H): Suppress bogus warnings from Apple
clang 13 (clang-1300.0.29.30).  Problem privately reported by
Mattias Engdegård for GNU Emacs.
---
 ChangeLog      | 7 +++++++
 m4/assert_h.m4 | 1 +
 2 files changed, 8 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 3b97909de5..74b496ddee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2022-09-30  Paul Eggert  <eggert@cs.ucla.edu>
+
+       assert-h: suppress Apple clang 13 false alarms
+       * m4/assert_h.m4 (gl_ASSERT_H): Suppress bogus warnings from Apple
+       clang 13 (clang-1300.0.29.30).  Problem privately reported by
+       Mattias Engdegård for GNU Emacs.
+
 2022-09-26  Daiki Ueno  <ueno@gnu.org>
 
        largefile: fix detection of time_t size on mingw32
diff --git a/m4/assert_h.m4 b/m4/assert_h.m4
index c411a34aa7..c1306daef4 100644
--- a/m4/assert_h.m4
+++ b/m4/assert_h.m4
@@ -18,6 +18,7 @@ AC_DEFUN([gl_ASSERT_H],
        [AC_LANG_PROGRAM(
           [[#if defined __clang__ && __STDC_VERSION__ < 202311
              #pragma clang diagnostic error "-Wc2x-extensions"
+             #pragma clang diagnostic error "-Wc++17-extensions"
             #endif
             #ifdef INCLUDE_ASSERT_H
              #include <assert.h>
-- 
2.37.3