target.h (struct gcc_target): Add target_help field.

* target.h (struct gcc_target): Add target_help field.
* target-def.h (TARGET_HELP): New.
  (TARGET_INITIALIZER): Use TARGET_HELP.
* opts.c (command_handle_option): Invoke target_help function, if defined, when the 
  user has specified --target-help on the command line.
* doc/invoke.texi: Mention that --target-help might print additional information.
* doc/tm.texi: Document TARGET_HELP hook.

* arm.c (TARGET_HELP): Override default definition.
  (arm_target_help): New - display a wrapped list of cores and architectures supported.

From-SVN: r126323

1 files changed, 4 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 974c19b..97bcb9f 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -1229,6 +1229,10 @@ common_handle_option (size_t scode, const char *arg, int value,
     case OPT__target_help:
       print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0);
       exit_after_options = true;
+
+      /* Allow the target a chance to give the user some additional information.  */
+      if (targetm.target_help)
+	targetm.target_help ();
       break;
 
     case OPT_fhelp_: