--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/c-opts.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,1653 @@
+/* C/ObjC/C++ command line option handling.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   Free Software Foundation, Inc.
+   Contributed by Neil Booth.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tree.h"
+#include "c-common.h"
+#include "c-pragma.h"
+#include "flags.h"
+#include "toplev.h"
+#include "langhooks.h"
+#include "tree-inline.h"
+#include "diagnostic.h"
+#include "intl.h"
+#include "cppdefault.h"
+#include "incpath.h"
+#include "debug.h"		/* For debug_hooks.  */
+#include "opts.h"
+#include "options.h"
+#include "mkdeps.h"
+#include "target.h"
+#include "tm_p.h"
+
+#ifndef DOLLARS_IN_IDENTIFIERS
+# define DOLLARS_IN_IDENTIFIERS true
+#endif
+
+#ifndef TARGET_SYSTEM_ROOT
+# define TARGET_SYSTEM_ROOT NULL
+#endif
+
+#ifndef TARGET_OPTF
+#define TARGET_OPTF(ARG)
+#endif
+
+/* CPP's options.  */
+cpp_options *cpp_opts;
+
+/* Input filename.  */
+static const char *this_input_filename;
+
+/* Filename and stream for preprocessed output.  */
+static const char *out_fname;
+static FILE *out_stream;
+
+/* Append dependencies to deps_file.  */
+static bool deps_append;
+
+/* If dependency switches (-MF etc.) have been given.  */
+static bool deps_seen;
+
+/* If -v seen.  */
+static bool verbose;
+
+/* Dependency output file.  */
+static const char *deps_file;
+
+/* The prefix given by -iprefix, if any.  */
+static const char *iprefix;
+
+/* The multilib directory given by -imultilib, if any.  */
+static const char *imultilib;
+
+/* The system root, if any.  Overridden by -isysroot.  */
+static const char *sysroot = TARGET_SYSTEM_ROOT;
+
+/* Zero disables all standard directories for headers.  */
+static bool std_inc = true;
+
+/* Zero disables the C++-specific standard directories for headers.  */
+static bool std_cxx_inc = true;
+
+/* If the quote chain has been split by -I-.  */
+static bool quote_chain_split;
+
+/* If -Wunused-macros.  */
+static bool warn_unused_macros;
+
+/* If -Wvariadic-macros.  */
+static bool warn_variadic_macros = true;
+
+/* Number of deferred options.  */
+static size_t deferred_count;
+
+/* Number of deferred options scanned for -include.  */
+static size_t include_cursor;
+
+static void set_Wimplicit (int);
+static void handle_OPT_d (const char *);
+static void set_std_cxx98 (int);
+static void set_std_cxx0x (int);
+static void set_std_c89 (int, int);
+static void set_std_c99 (int);
+static void check_deps_environment_vars (void);
+static void handle_deferred_opts (void);
+static void sanitize_cpp_opts (void);
+static void add_prefixed_path (const char *, size_t);
+static void push_command_line_include (void);
+static void cb_file_change (cpp_reader *, const struct line_map *);
+static void cb_dir_change (cpp_reader *, const char *);
+static void finish_options (void);
+
+#ifndef STDC_0_IN_SYSTEM_HEADERS
+#define STDC_0_IN_SYSTEM_HEADERS 0
+#endif
+
+/* Holds switches parsed by c_common_handle_option (), but whose
+   handling is deferred to c_common_post_options ().  */
+static void defer_opt (enum opt_code, const char *);
+static struct deferred_opt
+{
+  enum opt_code code;
+  const char *arg;
+} *deferred_opts;
+
+/* Complain that switch CODE expects an argument but none was
+   provided.  OPT was the command-line option.  Return FALSE to get
+   the default message in opts.c, TRUE if we provide a specialized
+   one.  */
+bool
+c_common_missing_argument (const char *opt, size_t code)
+{
+  switch (code)
+    {
+    default:
+      /* Pick up the default message.  */
+      return false;
+
+    case OPT_fconstant_string_class_:
+      error ("no class name specified with %qs", opt);
+      break;
+
+    case OPT_A:
+      error ("assertion missing after %qs", opt);
+      break;
+
+    case OPT_D:
+    case OPT_U:
+      error ("macro name missing after %qs", opt);
+      break;
+
+    case OPT_F:
+    case OPT_I:
+    case OPT_idirafter:
+    case OPT_isysroot:
+    case OPT_isystem:
+    case OPT_iquote:
+      error ("missing path after %qs", opt);
+      break;
+
+    case OPT_MF:
+    case OPT_MD:
+    case OPT_MMD:
+    case OPT_include:
+    case OPT_imacros:
+    case OPT_o:
+      error ("missing filename after %qs", opt);
+      break;
+
+    case OPT_MQ:
+    case OPT_MT:
+      error ("missing makefile target after %qs", opt);
+      break;
+    }
+
+  return true;
+}
+
+/* Defer option CODE with argument ARG.  */
+static void
+defer_opt (enum opt_code code, const char *arg)
+{
+  deferred_opts[deferred_count].code = code;
+  deferred_opts[deferred_count].arg = arg;
+  deferred_count++;
+}
+
+/* Common initialization before parsing options.  */
+unsigned int
+c_common_init_options (unsigned int argc, const char **argv)
+{
+  static const unsigned int lang_flags[] = {CL_C, CL_ObjC, CL_CXX, CL_ObjCXX};
+  unsigned int i, result;
+
+  /* This is conditionalized only because that is the way the front
+     ends used to do it.  Maybe this should be unconditional?  */
+  if (c_dialect_cxx ())
+    {
+      /* By default wrap lines at 80 characters.  Is getenv
+	 ("COLUMNS") preferable?  */
+      diagnostic_line_cutoff (global_dc) = 80;
+      /* By default, emit location information once for every
+	 diagnostic message.  */
+      diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
+    }
+
+  parse_in = cpp_create_reader (c_dialect_cxx () ? CLK_GNUCXX: CLK_GNUC89,
+				ident_hash, line_table);
+
+  cpp_opts = cpp_get_options (parse_in);
+  cpp_opts->dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
+  cpp_opts->objc = c_dialect_objc ();
+
+  /* Reset to avoid warnings on internal definitions.  We set it just
+     before passing on command-line options to cpplib.  */
+  cpp_opts->warn_dollars = 0;
+
+  flag_exceptions = c_dialect_cxx ();
+  warn_pointer_arith = c_dialect_cxx ();
+  warn_write_strings = c_dialect_cxx();
+
+  /* By default, C99-like requirements for complex multiply and divide.  */
+  flag_complex_method = 2;
+
+  deferred_opts = XNEWVEC (struct deferred_opt, argc);
+
+  result = lang_flags[c_language];
+
+  if (c_language == clk_c)
+    {
+      /* If preprocessing assembly language, accept any of the C-family
+	 front end options since the driver may pass them through.  */
+      for (i = 1; i < argc; i++)
+	if (! strcmp (argv[i], "-lang-asm"))
+	  {
+	    result |= CL_C | CL_ObjC | CL_CXX | CL_ObjCXX;
+	    break;
+	  }
+    }
+
+  return result;
+}
+
+/* Handle switch SCODE with argument ARG.  VALUE is true, unless no-
+   form of an -f or -W option was given.  Returns 0 if the switch was
+   invalid, a negative number to prevent language-independent
+   processing in toplev.c (a hack necessary for the short-term).  */
+int
+c_common_handle_option (size_t scode, const char *arg, int value)
+{
+  const struct cl_option *option = &cl_options[scode];
+  enum opt_code code = (enum opt_code) scode;
+  int result = 1;
+
+  /* Prevent resetting the language standard to a C dialect when the driver
+     has already determined that we're looking at assembler input.  */
+  bool preprocessing_asm_p = (cpp_get_options (parse_in)->lang == CLK_ASM);
+ 
+  switch (code)
+    {
+    default:
+      if (cl_options[code].flags & (CL_C | CL_CXX | CL_ObjC | CL_ObjCXX))
+	{
+	  if ((option->flags & CL_TARGET)
+	      && ! targetcm.handle_c_option (scode, arg, value))
+	    result = 0;
+	  break;
+	}
+      result = 0;
+      break;
+
+    case OPT__output_pch_:
+      pch_file = arg;
+      break;
+
+    case OPT_A:
+      defer_opt (code, arg);
+      break;
+
+    case OPT_C:
+      cpp_opts->discard_comments = 0;
+      break;
+
+    case OPT_CC:
+      cpp_opts->discard_comments = 0;
+      cpp_opts->discard_comments_in_macro_exp = 0;
+      break;
+
+    case OPT_D:
+      defer_opt (code, arg);
+      break;
+
+    case OPT_E:
+      flag_preprocess_only = 1;
+      break;
+
+    case OPT_H:
+      cpp_opts->print_include_names = 1;
+      break;
+
+    case OPT_F:
+      TARGET_OPTF (xstrdup (arg));
+      break;
+
+    case OPT_I:
+      if (strcmp (arg, "-"))
+	add_path (xstrdup (arg), BRACKET, 0, true);
+      else
+	{
+	  if (quote_chain_split)
+	    error ("-I- specified twice");
+	  quote_chain_split = true;
+	  split_quote_chain ();
+	  inform (input_location, "obsolete option -I- used, please use -iquote instead");
+	}
+      break;
+
+    case OPT_M:
+    case OPT_MM:
+      /* When doing dependencies with -M or -MM, suppress normal
+	 preprocessed output, but still do -dM etc. as software
+	 depends on this.  Preprocessed output does occur if -MD, -MMD
+	 or environment var dependency generation is used.  */
+      cpp_opts->deps.style = (code == OPT_M ? DEPS_SYSTEM: DEPS_USER);
+      flag_no_output = 1;
+      cpp_opts->inhibit_warnings = 1;
+      break;
+
+    case OPT_MD:
+    case OPT_MMD:
+      cpp_opts->deps.style = (code == OPT_MD ? DEPS_SYSTEM: DEPS_USER);
+      deps_file = arg;
+      break;
+
+    case OPT_MF:
+      deps_seen = true;
+      deps_file = arg;
+      break;
+
+    case OPT_MG:
+      deps_seen = true;
+      cpp_opts->deps.missing_files = true;
+      break;
+
+    case OPT_MP:
+      deps_seen = true;
+      cpp_opts->deps.phony_targets = true;
+      break;
+
+    case OPT_MQ:
+    case OPT_MT:
+      deps_seen = true;
+      defer_opt (code, arg);
+      break;
+
+    case OPT_P:
+      flag_no_line_commands = 1;
+      break;
+
+    case OPT_fworking_directory:
+      flag_working_directory = value;
+      break;
+
+    case OPT_U:
+      defer_opt (code, arg);
+      break;
+
+    case OPT_Wall:
+      warn_unused = value;
+      set_Wformat (value);
+      set_Wimplicit (value);
+      warn_char_subscripts = value;
+      warn_missing_braces = value;
+      warn_parentheses = value;
+      warn_return_type = value;
+      warn_sequence_point = value;	/* Was C only.  */
+      warn_switch = value;
+      if (warn_strict_aliasing == -1)
+	set_Wstrict_aliasing (value);
+      warn_address = value;
+      if (warn_strict_overflow == -1)
+	warn_strict_overflow = value;
+      warn_array_bounds = value;
+      warn_volatile_register_var = value;
+
+      /* Only warn about unknown pragmas that are not in system
+	 headers.  */
+      warn_unknown_pragmas = value;
+
+      /* We save the value of warn_uninitialized, since if they put
+	 -Wuninitialized on the command line, we need to generate a
+	 warning about not using it without also specifying -O.  */
+      if (warn_uninitialized != 1)
+	warn_uninitialized = (value ? 2 : 0);
+
+      if (!c_dialect_cxx ())
+	{
+	  /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding
+	     can turn it off only if it's not explicit.  */
+	  if (warn_main == -1)
+	    warn_main = (value ? 2 : 0);
+	}
+      else
+	{
+	  /* C++-specific warnings.  */
+          warn_sign_compare = value;
+	  warn_reorder = value;
+          warn_cxx0x_compat = value;
+	}
+
+      cpp_opts->warn_trigraphs = value;
+      cpp_opts->warn_comments = value;
+      cpp_opts->warn_num_sign_change = value;
+
+      if (warn_pointer_sign == -1)
+	warn_pointer_sign = value;
+      break;
+
+    case OPT_Wbuiltin_macro_redefined:
+      cpp_opts->warn_builtin_macro_redefined = value;
+      break;
+
+    case OPT_Wcomment:
+    case OPT_Wcomments:
+      cpp_opts->warn_comments = value;
+      break;
+
+    case OPT_Wdeprecated:
+      cpp_opts->warn_deprecated = value;
+      break;
+
+    case OPT_Wendif_labels:
+      cpp_opts->warn_endif_labels = value;
+      break;
+
+    case OPT_Werror:
+      cpp_opts->warnings_are_errors = value;
+      global_dc->warning_as_error_requested = value;
+      break;
+
+    case OPT_Werror_implicit_function_declaration: 
+      /* For backward compatibility, this is the same as
+	 -Werror=implicit-function-declaration.  */
+      enable_warning_as_error ("implicit-function-declaration", value, CL_C | CL_ObjC); 
+      break;
+
+    case OPT_Wformat:
+      set_Wformat (value);
+      break;
+
+    case OPT_Wformat_:
+      set_Wformat (atoi (arg));
+      break;
+
+    case OPT_Wimplicit:
+      set_Wimplicit (value);
+      break;
+
+    case OPT_Wimport:
+      /* Silently ignore for now.  */
+      break;
+
+    case OPT_Winvalid_pch:
+      cpp_opts->warn_invalid_pch = value;
+      break;
+
+    case OPT_Wmissing_include_dirs:
+      cpp_opts->warn_missing_include_dirs = value;
+      break;
+
+    case OPT_Wmultichar:
+      cpp_opts->warn_multichar = value;
+      break;
+
+    case OPT_Wnormalized_:
+      if (!value || (arg && strcasecmp (arg, "none") == 0))
+	cpp_opts->warn_normalize = normalized_none;
+      else if (!arg || strcasecmp (arg, "nfkc") == 0)
+	cpp_opts->warn_normalize = normalized_KC;
+      else if (strcasecmp (arg, "id") == 0)
+	cpp_opts->warn_normalize = normalized_identifier_C;
+      else if (strcasecmp (arg, "nfc") == 0)
+	cpp_opts->warn_normalize = normalized_C;
+      else
+	error ("argument %qs to %<-Wnormalized%> not recognized", arg);
+      break;
+
+    case OPT_Wreturn_type:
+      warn_return_type = value;
+      break;
+
+    case OPT_Wstrict_null_sentinel:
+      warn_strict_null_sentinel = value;
+      break;
+
+    case OPT_Wsystem_headers:
+      cpp_opts->warn_system_headers = value;
+      break;
+
+    case OPT_Wtraditional:
+      cpp_opts->warn_traditional = value;
+      break;
+
+    case OPT_Wtrigraphs:
+      cpp_opts->warn_trigraphs = value;
+      break;
+
+    case OPT_Wundef:
+      cpp_opts->warn_undef = value;
+      break;
+
+    case OPT_Wunknown_pragmas:
+      /* Set to greater than 1, so that even unknown pragmas in
+	 system headers will be warned about.  */
+      warn_unknown_pragmas = value * 2;
+      break;
+
+    case OPT_Wunused_macros:
+      warn_unused_macros = value;
+      break;
+
+    case OPT_Wvariadic_macros:
+      warn_variadic_macros = value;
+      break;
+
+    case OPT_Wwrite_strings:
+      warn_write_strings = value;
+      break;
+
+    case OPT_Weffc__:
+      warn_ecpp = value;
+      if (value)
+        warn_nonvdtor = true;
+      break;
+
+    case OPT_ansi:
+      if (!c_dialect_cxx ())
+	set_std_c89 (false, true);
+      else
+	set_std_cxx98 (true);
+      break;
+
+    case OPT_d:
+      handle_OPT_d (arg);
+      break;
+
+    case OPT_fcond_mismatch:
+      if (!c_dialect_cxx ())
+	{
+	  flag_cond_mismatch = value;
+	  break;
+	}
+      /* Fall through.  */
+
+    case OPT_fall_virtual:
+    case OPT_falt_external_templates:
+    case OPT_fenum_int_equiv:
+    case OPT_fexternal_templates:
+    case OPT_fguiding_decls:
+    case OPT_fhonor_std:
+    case OPT_fhuge_objects:
+    case OPT_flabels_ok:
+    case OPT_fname_mangling_version_:
+    case OPT_fnew_abi:
+    case OPT_fnonnull_objects:
+    case OPT_fsquangle:
+    case OPT_fstrict_prototype:
+    case OPT_fthis_is_variable:
+    case OPT_fvtable_thunks:
+    case OPT_fxref:
+    case OPT_fvtable_gc:
+      warning (0, "switch %qs is no longer supported", option->opt_text);
+      break;
+
+    case OPT_faccess_control:
+      flag_access_control = value;
+      break;
+
+    case OPT_fasm:
+      flag_no_asm = !value;
+      break;
+
+    case OPT_fbuiltin:
+      flag_no_builtin = !value;
+      break;
+
+    case OPT_fbuiltin_:
+      if (value)
+	result = 0;
+      else
+	disable_builtin_function (arg);
+      break;
+
+    case OPT_fdirectives_only:
+      cpp_opts->directives_only = value;
+      break;
+
+    case OPT_fdollars_in_identifiers:
+      cpp_opts->dollars_in_ident = value;
+      break;
+
+    case OPT_ffreestanding:
+      value = !value;
+      /* Fall through....  */
+    case OPT_fhosted:
+      flag_hosted = value;
+      flag_no_builtin = !value;
+      break;
+
+    case OPT_fshort_double:
+      flag_short_double = value;
+      break;
+
+    case OPT_fshort_enums:
+      flag_short_enums = value;
+      break;
+
+    case OPT_fshort_wchar:
+      flag_short_wchar = value;
+      break;
+
+    case OPT_fsigned_bitfields:
+      flag_signed_bitfields = value;
+      break;
+
+    case OPT_fsigned_char:
+      flag_signed_char = value;
+      break;
+
+    case OPT_funsigned_bitfields:
+      flag_signed_bitfields = !value;
+      break;
+
+    case OPT_funsigned_char:
+      flag_signed_char = !value;
+      break;
+
+    case OPT_fcheck_new:
+      flag_check_new = value;
+      break;
+
+    case OPT_fconserve_space:
+      flag_conserve_space = value;
+      break;
+
+    case OPT_fconstant_string_class_:
+      constant_string_class_name = arg;
+      break;
+
+    case OPT_fdefault_inline:
+      flag_default_inline = value;
+      break;
+
+    case OPT_felide_constructors:
+      flag_elide_constructors = value;
+      break;
+
+    case OPT_fenforce_eh_specs:
+      flag_enforce_eh_specs = value;
+      break;
+
+    case OPT_fextended_identifiers:
+      cpp_opts->extended_identifiers = value;
+      break;
+
+    case OPT_ffor_scope:
+      flag_new_for_scope = value;
+      break;
+
+    case OPT_fgnu_keywords:
+      flag_no_gnu_keywords = !value;
+      break;
+
+    case OPT_fgnu_runtime:
+      flag_next_runtime = !value;
+      break;
+
+    case OPT_fhandle_exceptions:
+      warning (0, "-fhandle-exceptions has been renamed -fexceptions (and is now on by default)");
+      flag_exceptions = value;
+      break;
+
+    case OPT_fimplement_inlines:
+      flag_implement_inlines = value;
+      break;
+
+    case OPT_fimplicit_inline_templates:
+      flag_implicit_inline_templates = value;
+      break;
+
+    case OPT_fimplicit_templates:
+      flag_implicit_templates = value;
+      break;
+
+    case OPT_flax_vector_conversions:
+      flag_lax_vector_conversions = value;
+      break;
+
+    case OPT_fms_extensions:
+      flag_ms_extensions = value;
+      break;
+
+    case OPT_fnext_runtime:
+      flag_next_runtime = value;
+      break;
+
+    case OPT_fnil_receivers:
+      flag_nil_receivers = value;
+      break;
+
+    case OPT_fnonansi_builtins:
+      flag_no_nonansi_builtin = !value;
+      break;
+
+    case OPT_foperator_names:
+      cpp_opts->operator_names = value;
+      break;
+
+    case OPT_foptional_diags:
+      flag_optional_diags = value;
+      break;
+
+    case OPT_fpch_deps:
+      cpp_opts->restore_pch_deps = value;
+      break;
+
+    case OPT_fpch_preprocess:
+      flag_pch_preprocess = value;
+      break;
+
+    case OPT_fpermissive:
+      flag_permissive = value;
+      break;
+
+    case OPT_fpreprocessed:
+      cpp_opts->preprocessed = value;
+      break;
+
+    case OPT_freplace_objc_classes:
+      flag_replace_objc_classes = value;
+      break;
+
+    case OPT_frepo:
+      flag_use_repository = value;
+      if (value)
+	flag_implicit_templates = 0;
+      break;
+
+    case OPT_frtti:
+      flag_rtti = value;
+      break;
+
+    case OPT_fshow_column:
+      cpp_opts->show_column = value;
+      break;
+
+    case OPT_fstats:
+      flag_detailed_statistics = value;
+      break;
+
+    case OPT_ftabstop_:
+      /* It is documented that we silently ignore silly values.  */
+      if (value >= 1 && value <= 100)
+	cpp_opts->tabstop = value;
+      break;
+
+    case OPT_fexec_charset_:
+      cpp_opts->narrow_charset = arg;
+      break;
+
+    case OPT_fwide_exec_charset_:
+      cpp_opts->wide_charset = arg;
+      break;
+
+    case OPT_finput_charset_:
+      cpp_opts->input_charset = arg;
+      break;
+
+    case OPT_ftemplate_depth_:
+      max_tinst_depth = value;
+      break;
+
+    case OPT_fuse_cxa_atexit:
+      flag_use_cxa_atexit = value;
+      break;
+
+    case OPT_fuse_cxa_get_exception_ptr:
+      flag_use_cxa_get_exception_ptr = value;
+      break;
+
+    case OPT_fvisibility_inlines_hidden:
+      visibility_options.inlines_hidden = value;
+      break;
+
+    case OPT_fweak:
+      flag_weak = value;
+      break;
+
+    case OPT_fthreadsafe_statics:
+      flag_threadsafe_statics = value;
+      break;
+
+    case OPT_fzero_link:
+      flag_zero_link = value;
+      break;
+
+    case OPT_gen_decls:
+      flag_gen_declaration = 1;
+      break;
+
+    case OPT_femit_struct_debug_baseonly:
+      set_struct_debug_option ("base");
+      break;
+
+    case OPT_femit_struct_debug_reduced:
+      set_struct_debug_option ("dir:ord:sys,dir:gen:any,ind:base");
+      break;
+
+    case OPT_femit_struct_debug_detailed_:
+      set_struct_debug_option (arg);
+      break;
+
+    case OPT_idirafter:
+      add_path (xstrdup (arg), AFTER, 0, true);
+      break;
+
+    case OPT_imacros:
+    case OPT_include:
+      defer_opt (code, arg);
+      break;
+
+    case OPT_imultilib:
+      imultilib = arg;
+      break;
+
+    case OPT_iprefix:
+      iprefix = arg;
+      break;
+
+    case OPT_iquote:
+      add_path (xstrdup (arg), QUOTE, 0, true);
+      break;
+
+    case OPT_isysroot:
+      sysroot = arg;
+      break;
+
+    case OPT_isystem:
+      add_path (xstrdup (arg), SYSTEM, 0, true);
+      break;
+
+    case OPT_iwithprefix:
+      add_prefixed_path (arg, SYSTEM);
+      break;
+
+    case OPT_iwithprefixbefore:
+      add_prefixed_path (arg, BRACKET);
+      break;
+
+    case OPT_lang_asm:
+      cpp_set_lang (parse_in, CLK_ASM);
+      cpp_opts->dollars_in_ident = false;
+      break;
+
+    case OPT_lang_objc:
+      cpp_opts->objc = 1;
+      break;
+
+    case OPT_nostdinc:
+      std_inc = false;
+      break;
+
+    case OPT_nostdinc__:
+      std_cxx_inc = false;
+      break;
+
+    case OPT_o:
+      if (!out_fname)
+	out_fname = arg;
+      else
+	error ("output filename specified twice");
+      break;
+
+      /* We need to handle the -pedantic switches here, rather than in
+	 c_common_post_options, so that a subsequent -Wno-endif-labels
+	 is not overridden.  */
+    case OPT_pedantic_errors:
+      cpp_opts->pedantic_errors = 1;
+      /* Fall through.  */
+    case OPT_pedantic:
+      cpp_opts->pedantic = 1;
+      cpp_opts->warn_endif_labels = 1;
+      if (warn_pointer_sign == -1)
+	warn_pointer_sign = 1;
+      if (warn_overlength_strings == -1)
+	warn_overlength_strings = 1;
+      if (warn_main == -1)
+	warn_main = 2;
+      break;
+
+    case OPT_print_objc_runtime_info:
+      print_struct_values = 1;
+      break;
+
+    case OPT_print_pch_checksum:
+      c_common_print_pch_checksum (stdout);
+      exit_after_options = true;
+      break;
+
+    case OPT_remap:
+      cpp_opts->remap = 1;
+      break;
+
+    case OPT_std_c__98:
+    case OPT_std_gnu__98:
+      if (!preprocessing_asm_p)
+	set_std_cxx98 (code == OPT_std_c__98 /* ISO */);
+      break;
+
+    case OPT_std_c__0x:
+    case OPT_std_gnu__0x:
+      if (!preprocessing_asm_p)
+	set_std_cxx0x (code == OPT_std_c__0x /* ISO */);
+      break;
+
+    case OPT_std_c89:
+    case OPT_std_iso9899_1990:
+    case OPT_std_iso9899_199409:
+      if (!preprocessing_asm_p)
+	set_std_c89 (code == OPT_std_iso9899_199409 /* c94 */, true /* ISO */);
+      break;
+
+    case OPT_std_gnu89:
+      if (!preprocessing_asm_p)
+	set_std_c89 (false /* c94 */, false /* ISO */);
+      break;
+
+    case OPT_std_c99:
+    case OPT_std_c9x:
+    case OPT_std_iso9899_1999:
+    case OPT_std_iso9899_199x:
+      if (!preprocessing_asm_p)
+	set_std_c99 (true /* ISO */);
+      break;
+
+    case OPT_std_gnu99:
+    case OPT_std_gnu9x:
+      if (!preprocessing_asm_p)
+	set_std_c99 (false /* ISO */);
+      break;
+
+    case OPT_trigraphs:
+      cpp_opts->trigraphs = 1;
+      break;
+
+    case OPT_traditional_cpp:
+      cpp_opts->traditional = 1;
+      break;
+
+    case OPT_undef:
+      flag_undef = 1;
+      break;
+
+    case OPT_w:
+      cpp_opts->inhibit_warnings = 1;
+      break;
+
+    case OPT_v:
+      verbose = true;
+      break;
+
+    case OPT_Wabi:
+      warn_psabi = value;
+      break;
+    }
+
+  return result;
+}
+
+/* Post-switch processing.  */
+bool
+c_common_post_options (const char **pfilename)
+{
+  struct cpp_callbacks *cb;
+
+  /* Canonicalize the input and output filenames.  */
+  if (in_fnames == NULL)
+    {
+      in_fnames = XNEWVEC (const char *, 1);
+      in_fnames[0] = "";
+    }
+  else if (strcmp (in_fnames[0], "-") == 0)
+    in_fnames[0] = "";
+
+  if (out_fname == NULL || !strcmp (out_fname, "-"))
+    out_fname = "";
+
+  if (cpp_opts->deps.style == DEPS_NONE)
+    check_deps_environment_vars ();
+
+  handle_deferred_opts ();
+
+  sanitize_cpp_opts ();
+
+  register_include_chains (parse_in, sysroot, iprefix, imultilib,
+			   std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
+
+#ifdef C_COMMON_OVERRIDE_OPTIONS
+  /* Some machines may reject certain combinations of C
+     language-specific options.  */
+  C_COMMON_OVERRIDE_OPTIONS;
+#endif
+
+  /* By default we use C99 inline semantics in GNU99 or C99 mode.  C99
+     inline semantics are not supported in GNU89 or C89 mode.  */
+  if (flag_gnu89_inline == -1)
+    flag_gnu89_inline = !flag_isoc99;
+  else if (!flag_gnu89_inline && !flag_isoc99)
+    error ("-fno-gnu89-inline is only supported in GNU99 or C99 mode");
+
+  /* Default to ObjC sjlj exception handling if NeXT runtime.  */
+  if (flag_objc_sjlj_exceptions < 0)
+    flag_objc_sjlj_exceptions = flag_next_runtime;
+  if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
+    flag_exceptions = 1;
+
+  /* -Wextra implies -Wtype-limits, -Wclobbered, 
+     -Wempty-body, -Wsign-compare, 
+     -Wmissing-field-initializers, -Wmissing-parameter-type
+     -Wold-style-declaration, -Woverride-init and -Wignored-qualifiers
+     but not if explicitly overridden.  */
+  if (warn_type_limits == -1)
+    warn_type_limits = extra_warnings;
+  if (warn_clobbered == -1)
+    warn_clobbered = extra_warnings;
+  if (warn_empty_body == -1)
+    warn_empty_body = extra_warnings;
+  if (warn_sign_compare == -1)
+    warn_sign_compare = extra_warnings;
+  if (warn_missing_field_initializers == -1)
+    warn_missing_field_initializers = extra_warnings;
+  if (warn_missing_parameter_type == -1)
+    warn_missing_parameter_type = extra_warnings;
+  if (warn_old_style_declaration == -1)
+    warn_old_style_declaration = extra_warnings;
+  if (warn_override_init == -1)
+    warn_override_init = extra_warnings;
+  if (warn_ignored_qualifiers == -1)
+    warn_ignored_qualifiers = extra_warnings;
+
+  /* -Wpointer-sign is disabled by default, but it is enabled if any
+     of -Wall or -pedantic are given.  */
+  if (warn_pointer_sign == -1)
+    warn_pointer_sign = 0;
+
+  if (warn_strict_aliasing == -1)
+    warn_strict_aliasing = 0;
+  if (warn_strict_overflow == -1)
+    warn_strict_overflow = 0;
+
+  /* -Woverlength-strings is off by default, but is enabled by -pedantic.
+     It is never enabled in C++, as the minimum limit is not normative
+     in that standard.  */
+  if (warn_overlength_strings == -1 || c_dialect_cxx ())
+    warn_overlength_strings = 0;
+
+  /* Wmain is enabled by default in C++ but not in C.  */
+  /* Wmain is disabled by default for -ffreestanding (!flag_hosted),
+     even if -Wall was given (warn_main will be 2 if set by -Wall, 1
+     if set by -Wmain).  */
+  if (warn_main == -1)
+    warn_main = (c_dialect_cxx () && flag_hosted) ? 1 : 0;
+  else if (warn_main == 2)
+    warn_main = flag_hosted ? 1 : 0;
+
+  /* In C, -Wconversion enables -Wsign-conversion (unless disabled
+     through -Wno-sign-conversion). While in C++,
+     -Wsign-conversion needs to be requested explicitly.  */
+  if (warn_sign_conversion == -1)
+    warn_sign_conversion =  (c_dialect_cxx ()) ? 0 : warn_conversion;
+
+  /* -Wpacked-bitfield-compat is on by default for the C languages.  The
+     warning is issued in stor-layout.c which is not part of the front-end so
+     we need to selectively turn it on here.  */
+  if (warn_packed_bitfield_compat == -1)
+    warn_packed_bitfield_compat = 1;
+
+  /* Special format checking options don't work without -Wformat; warn if
+     they are used.  */
+  if (!warn_format)
+    {
+      warning (OPT_Wformat_y2k,
+	       "-Wformat-y2k ignored without -Wformat");
+      warning (OPT_Wformat_extra_args,
+	       "-Wformat-extra-args ignored without -Wformat");
+      warning (OPT_Wformat_zero_length,
+	       "-Wformat-zero-length ignored without -Wformat");
+      warning (OPT_Wformat_nonliteral,
+	       "-Wformat-nonliteral ignored without -Wformat");
+      warning (OPT_Wformat_contains_nul,
+	       "-Wformat-contains-nul ignored without -Wformat");
+      warning (OPT_Wformat_security,
+	       "-Wformat-security ignored without -Wformat");
+    }
+
+  /* -Wimplicit-function-declaration is enabled by default for C99.  */
+  if (warn_implicit_function_declaration == -1) 
+    warn_implicit_function_declaration = flag_isoc99;
+
+  /* If we're allowing C++0x constructs, don't warn about C++0x
+     compatibility problems.  */
+  if (cxx_dialect == cxx0x)
+    warn_cxx0x_compat = 0;
+
+  if (flag_preprocess_only)
+    {
+      /* Open the output now.  We must do so even if flag_no_output is
+	 on, because there may be other output than from the actual
+	 preprocessing (e.g. from -dM).  */
+      if (out_fname[0] == '\0')
+	out_stream = stdout;
+      else
+	out_stream = fopen (out_fname, "w");
+
+      if (out_stream == NULL)
+	{
+	  fatal_error ("opening output file %s: %m", out_fname);
+	  return false;
+	}
+
+      if (num_in_fnames > 1)
+	error ("too many filenames given.  Type %s --help for usage",
+	       progname);
+
+      init_pp_output (out_stream);
+    }
+  else
+    {
+      init_c_lex ();
+
+      /* Yuk.  WTF is this?  I do know ObjC relies on it somewhere.  */
+      input_location = UNKNOWN_LOCATION;
+    }
+
+  cb = cpp_get_callbacks (parse_in);
+  cb->file_change = cb_file_change;
+  cb->dir_change = cb_dir_change;
+  cpp_post_options (parse_in);
+
+  input_location = UNKNOWN_LOCATION;
+
+  /* If an error has occurred in cpplib, note it so we fail
+     immediately.  */
+  errorcount += cpp_errors (parse_in);
+
+  *pfilename = this_input_filename
+    = cpp_read_main_file (parse_in, in_fnames[0]);
+  /* Don't do any compilation or preprocessing if there is no input file.  */
+  if (this_input_filename == NULL)
+    {
+      errorcount++;
+      return false;
+    }
+
+  if (flag_working_directory
+      && flag_preprocess_only && !flag_no_line_commands)
+    pp_dir_change (parse_in, get_src_pwd ());
+
+  return flag_preprocess_only;
+}
+
+/* Front end initialization common to C, ObjC and C++.  */
+bool
+c_common_init (void)
+{
+  /* Set up preprocessor arithmetic.  Must be done after call to
+     c_common_nodes_and_builtins for type nodes to be good.  */
+  cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
+  cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
+  cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
+  cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
+  cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
+  cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
+
+  /* This can't happen until after wchar_precision and bytes_big_endian
+     are known.  */
+  cpp_init_iconv (parse_in);
+
+  if (version_flag)
+    c_common_print_pch_checksum (stderr);
+
+  /* Has to wait until now so that cpplib has its hash table.  */
+  init_pragma ();
+
+  if (flag_preprocess_only)
+    {
+      finish_options ();
+      preprocess_file (parse_in);
+      return false;
+    }
+
+  return true;
+}
+
+/* Initialize the integrated preprocessor after debug output has been
+   initialized; loop over each input file.  */
+void
+c_common_parse_file (int set_yydebug)
+{
+  unsigned int i;
+
+  if (set_yydebug)
+    switch (c_language)
+      {
+      case clk_c:
+	warning(0, "The C parser does not support -dy, option ignored");
+	break;
+      case clk_objc:
+	warning(0,
+		"The Objective-C parser does not support -dy, option ignored");
+	break;
+      case clk_cxx:
+	warning(0, "The C++ parser does not support -dy, option ignored");
+	break;
+      case clk_objcxx:
+	warning(0,
+	    "The Objective-C++ parser does not support -dy, option ignored");
+	break;
+      default:
+	gcc_unreachable ();
+    }
+
+  i = 0;
+  for (;;)
+    {
+      /* Start the main input file, if the debug writer wants it. */
+      if (debug_hooks->start_end_main_source_file)
+	(*debug_hooks->start_source_file) (0, this_input_filename);
+      finish_options ();
+      pch_init ();
+      push_file_scope ();
+      c_parse_file ();
+      finish_file ();
+      pop_file_scope ();
+      /* And end the main input file, if the debug writer wants it  */
+      if (debug_hooks->start_end_main_source_file)
+	(*debug_hooks->end_source_file) (0);
+      if (++i >= num_in_fnames)
+	break;
+      cpp_undef_all (parse_in);
+      cpp_clear_file_cache (parse_in);
+      this_input_filename
+	= cpp_read_main_file (parse_in, in_fnames[i]);
+      /* If an input file is missing, abandon further compilation.
+	 cpplib has issued a diagnostic.  */
+      if (!this_input_filename)
+	break;
+    }
+}
+
+/* Common finish hook for the C, ObjC and C++ front ends.  */
+void
+c_common_finish (void)
+{
+  FILE *deps_stream = NULL;
+
+  if (cpp_opts->deps.style != DEPS_NONE)
+    {
+      /* If -M or -MM was seen without -MF, default output to the
+	 output stream.  */
+      if (!deps_file)
+	deps_stream = out_stream;
+      else
+	{
+	  deps_stream = fopen (deps_file, deps_append ? "a": "w");
+	  if (!deps_stream)
+	    fatal_error ("opening dependency file %s: %m", deps_file);
+	}
+    }
+
+  /* For performance, avoid tearing down cpplib's internal structures
+     with cpp_destroy ().  */
+  errorcount += cpp_finish (parse_in, deps_stream);
+
+  if (deps_stream && deps_stream != out_stream
+      && (ferror (deps_stream) || fclose (deps_stream)))
+    fatal_error ("closing dependency file %s: %m", deps_file);
+
+  if (out_stream && (ferror (out_stream) || fclose (out_stream)))
+    fatal_error ("when writing output to %s: %m", out_fname);
+}
+
+/* Either of two environment variables can specify output of
+   dependencies.  Their value is either "OUTPUT_FILE" or "OUTPUT_FILE
+   DEPS_TARGET", where OUTPUT_FILE is the file to write deps info to
+   and DEPS_TARGET is the target to mention in the deps.  They also
+   result in dependency information being appended to the output file
+   rather than overwriting it, and like Sun's compiler
+   SUNPRO_DEPENDENCIES suppresses the dependency on the main file.  */
+static void
+check_deps_environment_vars (void)
+{
+  char *spec;
+
+  GET_ENVIRONMENT (spec, "DEPENDENCIES_OUTPUT");
+  if (spec)
+    cpp_opts->deps.style = DEPS_USER;
+  else
+    {
+      GET_ENVIRONMENT (spec, "SUNPRO_DEPENDENCIES");
+      if (spec)
+	{
+	  cpp_opts->deps.style = DEPS_SYSTEM;
+	  cpp_opts->deps.ignore_main_file = true;
+	}
+    }
+
+  if (spec)
+    {
+      /* Find the space before the DEPS_TARGET, if there is one.  */
+      char *s = strchr (spec, ' ');
+      if (s)
+	{
+	  /* Let the caller perform MAKE quoting.  */
+	  defer_opt (OPT_MT, s + 1);
+	  *s = '\0';
+	}
+
+      /* Command line -MF overrides environment variables and default.  */
+      if (!deps_file)
+	deps_file = spec;
+
+      deps_append = 1;
+      deps_seen = true;
+    }
+}
+
+/* Handle deferred command line switches.  */
+static void
+handle_deferred_opts (void)
+{
+  size_t i;
+  struct deps *deps;
+
+  /* Avoid allocating the deps buffer if we don't need it.
+     (This flag may be true without there having been -MT or -MQ
+     options, but we'll still need the deps buffer.)  */
+  if (!deps_seen)
+    return;
+
+  deps = cpp_get_deps (parse_in);
+
+  for (i = 0; i < deferred_count; i++)
+    {
+      struct deferred_opt *opt = &deferred_opts[i];
+
+      if (opt->code == OPT_MT || opt->code == OPT_MQ)
+	deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
+    }
+}
+
+/* These settings are appropriate for GCC, but not necessarily so for
+   cpplib as a library.  */
+static void
+sanitize_cpp_opts (void)
+{
+  /* If we don't know what style of dependencies to output, complain
+     if any other dependency switches have been given.  */
+  if (deps_seen && cpp_opts->deps.style == DEPS_NONE)
+    error ("to generate dependencies you must specify either -M or -MM");
+
+  /* -dM and dependencies suppress normal output; do it here so that
+     the last -d[MDN] switch overrides earlier ones.  */
+  if (flag_dump_macros == 'M')
+    flag_no_output = 1;
+
+  /* By default, -fdirectives-only implies -dD.  This allows subsequent phases
+     to perform proper macro expansion.  */
+  if (cpp_opts->directives_only && !cpp_opts->preprocessed && !flag_dump_macros)
+    flag_dump_macros = 'D';
+
+  /* Disable -dD, -dN and -dI if normal output is suppressed.  Allow
+     -dM since at least glibc relies on -M -dM to work.  */
+  /* Also, flag_no_output implies flag_no_line_commands, always.  */
+  if (flag_no_output)
+    {
+      if (flag_dump_macros != 'M')
+	flag_dump_macros = 0;
+      flag_dump_includes = 0;
+      flag_no_line_commands = 1;
+    }
+  else if (cpp_opts->deps.missing_files)
+    error ("-MG may only be used with -M or -MM");
+
+  cpp_opts->unsigned_char = !flag_signed_char;
+  cpp_opts->stdc_0_in_system_headers = STDC_0_IN_SYSTEM_HEADERS;
+
+  /* We want -Wno-long-long to override -pedantic -std=non-c99
+     and/or -Wtraditional, whatever the ordering.  */
+  cpp_opts->warn_long_long
+    = warn_long_long && ((pedantic
+			  && (c_dialect_cxx ()
+			      ? cxx_dialect == cxx98
+			      : !flag_isoc99))
+                         || warn_traditional);
+
+  /* Similarly with -Wno-variadic-macros.  No check for c99 here, since
+     this also turns off warnings about GCCs extension.  */
+  cpp_opts->warn_variadic_macros
+    = warn_variadic_macros && (pedantic || warn_traditional);
+
+  /* If we're generating preprocessor output, emit current directory
+     if explicitly requested or if debugging information is enabled.
+     ??? Maybe we should only do it for debugging formats that
+     actually output the current directory?  */
+  if (flag_working_directory == -1)
+    flag_working_directory = (debug_info_level != DINFO_LEVEL_NONE);
+
+  if (cpp_opts->directives_only)
+    {
+      if (warn_unused_macros)
+	error ("-fdirectives-only is incompatible with -Wunused_macros");
+      if (cpp_opts->traditional)
+	error ("-fdirectives-only is incompatible with -traditional");
+    }
+}
+
+/* Add include path with a prefix at the front of its name.  */
+static void
+add_prefixed_path (const char *suffix, size_t chain)
+{
+  char *path;
+  const char *prefix;
+  size_t prefix_len, suffix_len;
+
+  suffix_len = strlen (suffix);
+  prefix     = iprefix ? iprefix : cpp_GCC_INCLUDE_DIR;
+  prefix_len = iprefix ? strlen (iprefix) : cpp_GCC_INCLUDE_DIR_len;
+
+  path = (char *) xmalloc (prefix_len + suffix_len + 1);
+  memcpy (path, prefix, prefix_len);
+  memcpy (path + prefix_len, suffix, suffix_len);
+  path[prefix_len + suffix_len] = '\0';
+
+  add_path (path, chain, 0, false);
+}
+
+/* Handle -D, -U, -A, -imacros, and the first -include.  */
+static void
+finish_options (void)
+{
+  if (!cpp_opts->preprocessed)
+    {
+      size_t i;
+
+      cb_file_change (parse_in,
+		      linemap_add (line_table, LC_RENAME, 0,
+				   _("<built-in>"), 0));
+
+      cpp_init_builtins (parse_in, flag_hosted);
+      c_cpp_builtins (parse_in);
+
+      /* We're about to send user input to cpplib, so make it warn for
+	 things that we previously (when we sent it internal definitions)
+	 told it to not warn.
+
+	 C99 permits implementation-defined characters in identifiers.
+	 The documented meaning of -std= is to turn off extensions that
+	 conflict with the specified standard, and since a strictly
+	 conforming program cannot contain a '$', we do not condition
+	 their acceptance on the -std= setting.  */
+      cpp_opts->warn_dollars = (cpp_opts->pedantic && !cpp_opts->c99);
+
+      cb_file_change (parse_in,
+		      linemap_add (line_table, LC_RENAME, 0,
+				   _("<command-line>"), 0));
+
+      for (i = 0; i < deferred_count; i++)
+	{
+	  struct deferred_opt *opt = &deferred_opts[i];
+
+	  if (opt->code == OPT_D)
+	    cpp_define (parse_in, opt->arg);
+	  else if (opt->code == OPT_U)
+	    cpp_undef (parse_in, opt->arg);
+	  else if (opt->code == OPT_A)
+	    {
+	      if (opt->arg[0] == '-')
+		cpp_unassert (parse_in, opt->arg + 1);
+	      else
+		cpp_assert (parse_in, opt->arg);
+	    }
+	}
+
+      /* Handle -imacros after -D and -U.  */
+      for (i = 0; i < deferred_count; i++)
+	{
+	  struct deferred_opt *opt = &deferred_opts[i];
+
+	  if (opt->code == OPT_imacros
+	      && cpp_push_include (parse_in, opt->arg))
+	    {
+	      /* Disable push_command_line_include callback for now.  */
+	      include_cursor = deferred_count + 1;
+	      cpp_scan_nooutput (parse_in);
+	    }
+	}
+    }
+  else if (cpp_opts->directives_only)
+    cpp_init_special_builtins (parse_in);
+
+  include_cursor = 0;
+  push_command_line_include ();
+}
+
+/* Give CPP the next file given by -include, if any.  */
+static void
+push_command_line_include (void)
+{
+  while (include_cursor < deferred_count)
+    {
+      struct deferred_opt *opt = &deferred_opts[include_cursor++];
+
+      if (!cpp_opts->preprocessed && opt->code == OPT_include
+	  && cpp_push_include (parse_in, opt->arg))
+	return;
+    }
+
+  if (include_cursor == deferred_count)
+    {
+      include_cursor++;
+      /* -Wunused-macros should only warn about macros defined hereafter.  */
+      cpp_opts->warn_unused_macros = warn_unused_macros;
+      /* Restore the line map from <command line>.  */
+      if (!cpp_opts->preprocessed)
+	cpp_change_file (parse_in, LC_RENAME, this_input_filename);
+
+      /* Set this here so the client can change the option if it wishes,
+	 and after stacking the main file so we don't trace the main file.  */
+      line_table->trace_includes = cpp_opts->print_include_names;
+    }
+}
+
+/* File change callback.  Has to handle -include files.  */
+static void
+cb_file_change (cpp_reader * ARG_UNUSED (pfile),
+		const struct line_map *new_map)
+{
+  if (flag_preprocess_only)
+    pp_file_change (new_map);
+  else
+    fe_file_change (new_map);
+
+  if (new_map == 0 || (new_map->reason == LC_LEAVE && MAIN_FILE_P (new_map)))
+    push_command_line_include ();
+}
+
+void
+cb_dir_change (cpp_reader * ARG_UNUSED (pfile), const char *dir)
+{
+  if (!set_src_pwd (dir))
+    warning (0, "too late for # directive to set debug directory");
+}
+
+/* Set the C 89 standard (with 1994 amendments if C94, without GNU
+   extensions if ISO).  There is no concept of gnu94.  */
+static void
+set_std_c89 (int c94, int iso)
+{
+  cpp_set_lang (parse_in, c94 ? CLK_STDC94: iso ? CLK_STDC89: CLK_GNUC89);
+  flag_iso = iso;
+  flag_no_asm = iso;
+  flag_no_gnu_keywords = iso;
+  flag_no_nonansi_builtin = iso;
+  flag_isoc94 = c94;
+  flag_isoc99 = 0;
+}
+
+/* Set the C 99 standard (without GNU extensions if ISO).  */
+static void
+set_std_c99 (int iso)
+{
+  cpp_set_lang (parse_in, iso ? CLK_STDC99: CLK_GNUC99);
+  flag_no_asm = iso;
+  flag_no_nonansi_builtin = iso;
+  flag_iso = iso;
+  flag_isoc99 = 1;
+  flag_isoc94 = 1;
+}
+
+/* Set the C++ 98 standard (without GNU extensions if ISO).  */
+static void
+set_std_cxx98 (int iso)
+{
+  cpp_set_lang (parse_in, iso ? CLK_CXX98: CLK_GNUCXX);
+  flag_no_gnu_keywords = iso;
+  flag_no_nonansi_builtin = iso;
+  flag_iso = iso;
+  cxx_dialect = cxx98;
+}
+
+/* Set the C++ 0x working draft "standard" (without GNU extensions if ISO).  */
+static void
+set_std_cxx0x (int iso)
+{
+  cpp_set_lang (parse_in, iso ? CLK_CXX0X: CLK_GNUCXX0X);
+  flag_no_gnu_keywords = iso;
+  flag_no_nonansi_builtin = iso;
+  flag_iso = iso;
+  cxx_dialect = cxx0x;
+}
+
+/* Handle setting implicit to ON.  */
+static void
+set_Wimplicit (int on)
+{
+  warn_implicit = on;
+  warn_implicit_int = on;
+  warn_implicit_function_declaration = on;
+}
+
+/* Args to -d specify what to dump.  Silently ignore
+   unrecognized options; they may be aimed at toplev.c.  */
+static void
+handle_OPT_d (const char *arg)
+{
+  char c;
+
+  while ((c = *arg++) != '\0')
+    switch (c)
+      {
+      case 'M':			/* Dump macros only.  */
+      case 'N':			/* Dump names.  */
+      case 'D':			/* Dump definitions.  */
+      case 'U':			/* Dump used macros.  */
+	flag_dump_macros = c;
+	break;
+
+      case 'I':
+	flag_dump_includes = 1;
+	break;
+      }
+}