Migrate rest of compile commands to new options framework

As I was in the neighbourhood, I converted the other "compile"
subcommands to the new options framework too.  Specifically, "compile
code" and "compile file".

The user-visible changes are:

  - All abbreviations of "-raw" are accepted now, instead of just -r.
    Obviously that means "-ra" is now accepted.

  - Option completion now works.

  - "compile file" did not have a completer yet, and now it knows to
    complete on filenames.

  - You couldn't use "compile file" with a file named "-something".
    You can now, with "compile file -- -something".

gdb/ChangeLog:
2019-06-13  Pedro Alves  <palves@redhat.com>

	* compile/compile.c (struct compile_options): New.
	(compile_flag_option_def, compile_command_option_defs)
	(make_compile_options_def_group): New.
	(compile_file_command): Handle options with
	gdb::option::process_options.
	(compile_file_command_completer): New function.
	(compile_code_command): Handle options with
	gdb::option::process_options.
	(compile_code_command_completer): New function.
	(_initialize_compiler): Install completers for "compile code" and
	"compile file".  Mention available options in "compile code" and
	"compile code"'s help.
	* completer.c (advance_to_completion_word): New, factored out from
	...
	(advance_to_expression_complete_word_point): ... this.
	(advance_to_filename_complete_word_point): New.
	* completer.h (advance_to_filename_complete_word_point): New
	declaration.

gdb/testsuite/ChangeLog:
2019-06-13  Pedro Alves  <palves@redhat.com>

	* gdb.compile/compile.exp: Adjust expected output to option
	processing changes.

1 files changed, 6 insertions, 1 deletions

diff --git a/gdb/completer.h b/gdb/completer.h
index 27371b6..58fe84f 100644
--- a/gdb/completer.h
+++ b/gdb/completer.h
@@ -532,10 +532,15 @@ extern const char *completion_find_completion_word (completion_tracker &tracker,
    completion word point for TEXT, emulating the algorithm readline
    uses to find the word point, using the current language's word
    break characters.  */
-
 const char *advance_to_expression_complete_word_point
   (completion_tracker &tracker, const char *text);
 
+/* Assuming TEXT is an filename, find the completion word point for
+   TEXT, emulating the algorithm readline uses to find the word
+   point.  */
+extern const char *advance_to_filename_complete_word_point
+  (completion_tracker &tracker, const char *text);
+
 extern char **gdb_rl_attempted_completion_function (const char *text,
 						    int start, int end);