Update from Gnulib by running admin/merge-gnulib

diff --git a/m4/assert_h.m4 b/m4/assert_h.m4
index c411a34aa7bd2dc6fa8f250b17a00badbb6ed328..c1306daef4f233d9ee63e5a0ca04fc344eed3c36 100644 (file)
--- 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>