Enable -Wunused-local-typedefs when -Wall or -Wunused is on

Now that the libstdc++ testsuite is run with -ftrack-macro-location by
default, this patch triggers the -Wunused-local-typedefs warning when
-Wunused (and -Wall) is turned on.

The patch has been reviewed and accepted[1] a while ago, but was waiting
for the -ftrack-macro-expansion work to go in first.

Bootstrapped and tested again on x86_64-unknown-linux-gnu against
trunk.

Applied to the mainline.

[1]: http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00605.html

gcc/

	* opts.c (finish_options): Activate -Wunused-local-typedefs if
	-Wunused is activated.
	* doc/invoke.texi: Update blurb of -Wunused-local-typedefs.

From-SVN: r187167

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 22c7590..b6c786f 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -835,6 +835,10 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
   if (opts->x_warn_unused_value == -1)
     opts->x_warn_unused_value = opts->x_warn_unused;
 
+  /* Wunused-local-typedefs is enabled by -Wunused or -Wall.  */
+  if (opts->x_warn_unused_local_typedefs == -1)
+    opts->x_warn_unused_local_typedefs = opts->x_warn_unused;
+
   /* This replaces set_Wextra.  */
   if (opts->x_warn_uninitialized == -1)
     opts->x_warn_uninitialized = opts->x_extra_warnings;