gdb: Pass std::strings to ui_out::field_string () where convenient

While adding a ui_out::text () overload accepting a std::string, I
noticed that several callers of ui_out::field_string () were converting
std::string instances to char pointers even if not necessary.

gdb/ChangeLog:

	* ui-out.c (ui_out::field_string): Add missing style_argument
	to the overload accepting a std::string, to make it equivalent
	to the char pointer version.
	* ui-out.h (class ui_out): Ditto.
	* break-catch-sig.c (signal_catchpoint_print_one): Do not
	convert std::strings to char pointers before passing them to
	ui_out::field_string ().
	* break-catch-throw.c (print_one_detail_exception_catchpoint):
	Ditto.
	* cli/cli-setshow.c (do_show_command): Ditto.
	* disasm.c (gdb_pretty_print_disassembler::pretty_print_insn):
	Ditto.
	* infcmd.c (print_return_value_1): Ditto.
	* inferior.c (print_inferior): Ditto.
	* linux-thread-db.c (info_auto_load_libthread_db): Ditto.
	* mi/mi-cmd-var.c (print_varobj): Ditto.
	(mi_cmd_var_set_format): Ditto.
	(mi_cmd_var_info_type): Ditto.
	(mi_cmd_var_info_expression): Ditto.
	(mi_cmd_var_evaluate_expression): Ditto.
	(mi_cmd_var_assign): Ditto.
	(varobj_update_one): Ditto.
	* mi/mi-main.c (list_available_thread_groups): Ditto.
	(mi_cmd_data_read_memory_bytes): Ditto.
	(mi_cmd_trace_frame_collected): Ditto.
	* osdata.c (info_osdata): Ditto.
	* probe.c (info_probes_for_spops): Ditto.
	* target-connection.c (print_connection): Ditto.
	* thread.c (print_thread_info_1): Ditto.
	* tracepoint.c (print_one_static_tracepoint_marker): Ditto.

1 files changed, 2 insertions, 3 deletions

diff --git a/gdb/probe.c b/gdb/probe.c
index 9eccf82..d9a06e5 100644
--- a/gdb/probe.c
+++ b/gdb/probe.c
@@ -571,9 +571,8 @@ info_probes_for_spops (const char *arg, int from_tty,
 	ui_out_emit_tuple tuple_emitter (current_uiout, "probe");
 
 	current_uiout->field_string ("type", probe_type);
-	current_uiout->field_string ("provider",
-				     probe.prob->get_provider ().c_str ());
-	current_uiout->field_string ("name", probe.prob->get_name ().c_str ());
+	current_uiout->field_string ("provider", probe.prob->get_provider ());
+	current_uiout->field_string ("name", probe.prob->get_name ());
 	current_uiout->field_core_addr ("addr", probe.prob->get_gdbarch (),
 					probe.prob->get_relocated_address
 					(probe.objfile));