Issue with unittest/environ-selftests.c (DIAGNOSTIC_IGNORE_SELF_MOVE)

Hi!

I'm mass-building toolchain components and recently got failures all
over GDB when building it with quite recent GCC versions. Turns out
GCC recently got -Wself-move
(0abb78dda084a14b3d955757c6431fff71c263f3), but during unittests, that
is only dealt with when building with clang.

Building is done like this:

.../configure --prefix=/tmp/gdb-m68k-linux --target=m68k-linux
make V=1 all-gdb

/usr/lib/gcc-snapshot/bin/g++ -x c++    -I. -I. -I./config -DLOCALEDIR="\"/tmp/gdb-m68k-linux/share/locale\"" -DHAVE_CONFIG_H -I./../include/opcode -I./../readline/readline/.. -I./../zlib  -I../bfd -I./../bfd -I./../include -I../libdecnumber -I./../libdecnumber  -I./../gnulib/import -I../gnulib/import -I./.. -I.. -I./../libbacktrace/ -I../libbacktrace/  -DTUI=1    -I./.. -pthread  -Wall -Wpointer-arith -Wno-unused -Wunused-value -Wunused-variable -Wunused-function -Wno-switch -Wno-char-subscripts -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable -Wno-sign-compare -Wno-error=maybe-uninitialized -Wno-mismatched-tags -Wsuggest-override -Wimplicit-fallthrough=3 -Wduplicated-cond -Wshadow=local -Wdeprecated-copy -Wdeprecated-copy-dtor -Wredundant-move -Wmissing-declarations -Wstrict-null-sentinel -Wformat -Wformat-nonliteral -Werror -g -O2   -c -o unittests/environ-selftests.o -MT unittests/environ-selftests.o -MMD -MP -MF unittests/.deps/environ-selftests.Tpo unittests/environ-selftests.c
unittests/environ-selftests.c: In function 'void selftests::gdb_environ_tests::test_self_move()':
unittests/environ-selftests.c:228:7: error: moving 'env' of type 'gdb_environ' to itself [-Werror=self-move]
  228 |   env = std::move (env);
      |   ~~~~^~~~~~~~~~~~~~~~~
unittests/environ-selftests.c:228:7: note: remove 'std::move' call
cc1plus: all warnings being treated as errors
make[1]: *** [Makefile:1896: unittests/environ-selftests.o] Error 1
make[1]: Leaving directory '/var/lib/laminar/run/gdb-m68k-linux/3/binutils-gdb/gdb'
make: *** [Makefile:13193: all-gdb] Error 2

include:
	* diagnostics.h (DIAGNOSTIC_IGNORE_SELF_MOVE): Define for GCC 13+.

diff --git a/include/diagnostics.h b/include/diagnostics.h
index 4161dff6abc..c1a2e8f520c 100644
--- a/include/diagnostics.h
+++ b/include/diagnostics.h
@@ -99,6 +99,10 @@
    DIAGNOSTIC_IGNORE ("-Wunused-but-set-variable")
 # endif
 
+# if __GNUC__ >= 13
+#  define DIAGNOSTIC_IGNORE_SELF_MOVE DIAGNOSTIC_IGNORE ("-Wself-move")
+# endif
+
 /* GCC 4.8's "diagnostic push/pop" seems broken when using this, -Wswitch
    remains enabled at the error level even after a pop.  Therefore, don't
    use it for GCC < 5.  */

Ok for HEAD? Or should I send that to the Binutils mailing list?

Thanks,
  Jan-Benedict

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