Come up with new --completion option.

2018-06-28  Martin Liska  <mliska@suse.cz>

	* common.opt: Introduce -completion option.
	* gcc.c (driver_handle_option): Handle it.
	(driver::main): Print completions if completion
        is set.
	* opt-suggestions.c (option_proposer::get_completions):
        New function.
	(option_proposer::suggest_completion): Likewise.
	(option_proposer::find_param_completions): Likewise.
	(verify_autocompletions): Likewise.
	(test_completion_valid_options): Likewise.
	(test_completion_valid_params): Likewise.
	(in_completion_p): Likewise.
	(empty_completion_p): Likewise.
	(test_completion_partial_match): Likewise.
	(test_completion_garbage): Likewise.
	(opt_proposer_c_tests): Likewise.
	* opt-suggestions.h: Declare new functions.
	* opts.c (common_handle_option): Handle OPT__completion_.
	* selftest-run-tests.c (selftest::run_tests): Add
        opt_proposer_c_tests.
	* selftest.c (assert_str_startswith): New.
	* selftest.h (assert_str_startswith): Likewise.
	(opt_proposer_c_tests): New.
	(ASSERT_STR_STARTSWITH): Likewise.

From-SVN: r262210

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/gcc.c b/gcc/gcc.c
index dda1fd3..9ed8a03 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -221,6 +221,10 @@ static int print_help_list;
 
 static int print_version;
 
+/* Flag that stores string prefix for which we provide bash completion.  */
+
+static const char *completion = NULL;
+
 /* Flag indicating whether we should ONLY print the command and
    arguments (like verbose_flag) without executing the command.
    Displayed arguments are quoted so that the generated command
@@ -3890,6 +3894,11 @@ driver_handle_option (struct gcc_options *opts,
       add_linker_option ("--version", strlen ("--version"));
       break;
 
+    case OPT__completion_:
+      validated = true;
+      completion = decoded->arg;
+      break;
+
     case OPT__help:
       print_help_list = 1;
 
@@ -7300,6 +7309,12 @@ driver::main (int argc, char **argv)
   maybe_putenv_OFFLOAD_TARGETS ();
   handle_unrecognized_options ();
 
+  if (completion)
+    {
+      m_option_proposer.suggest_completion (completion);
+      return 0;
+    }
+
   if (!maybe_print_and_exit ())
     return 0;