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, 28 insertions, 6 deletions

diff --git a/gdb/completer.c b/gdb/completer.c
index 5dd9a99..0f4e7f9 100644
--- a/gdb/completer.c
+++ b/gdb/completer.c
@@ -352,16 +352,18 @@ gdb_rl_find_completion_word (struct gdb_rl_completion_word_info *info,
   return line_buffer + point;
 }
 
-/* See completer.h.  */
+/* Find the completion word point for TEXT, emulating the algorithm
+   readline uses to find the word point, using WORD_BREAK_CHARACTERS
+   as word break characters.  */
 
-const char *
-advance_to_expression_complete_word_point (completion_tracker &tracker,
-					   const char *text)
+static const char *
+advance_to_completion_word (completion_tracker &tracker,
+			    const char *word_break_characters,
+			    const char *text)
 {
   gdb_rl_completion_word_info info;
 
-  info.word_break_characters
-    = current_language->la_word_break_characters ();
+  info.word_break_characters = word_break_characters;
   info.quote_characters = gdb_completer_quote_characters;
   info.basic_quote_characters = rl_basic_quote_characters;
 
@@ -382,6 +384,26 @@ advance_to_expression_complete_word_point (completion_tracker &tracker,
 
 /* See completer.h.  */
 
+const char *
+advance_to_expression_complete_word_point (completion_tracker &tracker,
+					   const char *text)
+{
+  const char *brk_chars = current_language->la_word_break_characters ();
+  return advance_to_completion_word (tracker, brk_chars, text);
+}
+
+/* See completer.h.  */
+
+const char *
+advance_to_filename_complete_word_point (completion_tracker &tracker,
+					 const char *text)
+{
+  const char *brk_chars = gdb_completer_file_name_break_characters;
+  return advance_to_completion_word (tracker, brk_chars, text);
+}
+
+/* See completer.h.  */
+
 bool
 completion_tracker::completes_to_completion_word (const char *word)
 {