pmt: initial 3.0.2 update

include/libgnulib/unused-parameter.h

@@ -0,0 +1,29 @@
+/* A C macro for declaring that specific function parameters are not used.
+   Copyright (C) 2008-2024 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* _GL_UNUSED_PARAMETER is a marker that can be prepended to function parameter
+   declarations for parameters that are not used.  This helps to reduce
+   warnings, such as from GCC -Wunused-parameter.  The syntax is as follows:
+       _GL_UNUSED_PARAMETER type param
+   or more generally
+       _GL_UNUSED_PARAMETER param_decl
+   For example:
+       _GL_UNUSED_PARAMETER int param
+       _GL_UNUSED_PARAMETER int *(*param) (void)
+ */
+#ifndef _GL_UNUSED_PARAMETER
+# define _GL_UNUSED_PARAMETER _GL_ATTRIBUTE_MAYBE_UNUSED
+#endif