1 files changed, 24 insertions, 0 deletions
diff --git a/gl/m4/wmempcpy.m4 b/gl/m4/wmempcpy.m4
new file mode 100644
index 0000000..abf1df3
--- /dev/null
+++ b/gl/m4/wmempcpy.m4
@@ -0,0 +1,24 @@
+# wmempcpy.m4 serial 3
+dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_WMEMPCPY],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+
+  dnl Persuade glibc <wchar.h> to declare wmempcpy().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl The wmempcpy() declaration in lib/wchar.in.h uses 'restrict'.
+  AC_REQUIRE([AC_C_RESTRICT])
+
+  gl_CHECK_FUNCS_ANDROID([wmempcpy], [[#include <wchar.h>]])
+  if test $ac_cv_func_wmempcpy = no; then
+    HAVE_WMEMPCPY=0
+    case "$gl_cv_onwards_func_wmempcpy" in
+      future*) REPLACE_WMEMPCPY=1 ;;
+    esac
+  fi
+])