gdb: remove language_auto

I think that the language_auto enumerator and the auto_language class
can be removed.  There isn't really an "auto" language, it's only a
construct of the "set language" command to say "pick the appropriate
language automatically".  But "auto" is never the current language.  The
`current_language` points to the current effective language, and the
fact that we're in "auto language" mode is noted by the language_mode
global.

 - Change set_language to handle the "auto" (and "local", which is a
   synonym) early, instead of in the for loop.  I think it makes the two
   cases (auto vs explicit language) more clearly separated anyway.

 - Adjust add_set_language_command to hard-code the "auto" string,
   instead of using the "auto" language definition.

 - Remove auto_language, rename auto_or_unknown_language to
   unknown_language and move the bits of the existing unknown_language
   in there.

 - Remove the set_language at the end of _initialize_language.  I think
   it's not needed, because we call set_language in gdb_init, after all
   _initialize functions are called.  There is some chance that an
   _initialize function that runs after _initialize_language implicitly
   depends on current_language being set, but my testsuite runs haven't
   found anything like that.

 - Use language_unknown instead of language_auto when creating a minimal
   symbol (minimal_symbol_reader::record_full).  I think that this value
   is used to indicate that we don't know the symbol of the minimal
   symbol (yet), so language_unknown makes sense to me.  Update a
   condition accordingly in ada-lang.c.  symbol_find_demangled_name also
   appears to "normalize" this value from "unknown" to "auto", remove
   that part and update the condition to just check for
   language_unknown.

Change-Id: I47bcd6c15f607d9818f2e6e413053c2dc8ec5034
Reviewed-By: Tom Tromey <tom@tromey.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/gdb/symmisc.c b/gdb/symmisc.c
index 3d7fd56..4b68f2b 100644
--- a/gdb/symmisc.c
+++ b/gdb/symmisc.c
@@ -365,8 +365,7 @@ dump_symtab (struct symtab *symtab, struct ui_file *outfile)
      because certain routines used during dump_symtab() use the current
      language to print an image of the symbol.  We'll restore it later.
      But use only real languages, not placeholders.  */
-  if (symtab->language () != language_unknown
-      && symtab->language () != language_auto)
+  if (symtab->language () != language_unknown)
     {
       scoped_restore_current_language save_lang;
       set_language (symtab->language ());