gcc/c-opts.c


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/* C/ObjC/C++ command line option handling.
   Copyright (C) 2002, 2003, 2004, 2005, 2006 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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

#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 "c-incpath.h"
#include "debug.h"		/* For debug_hooks.  */
#include "opts.h"
#include "options.h"
#include "mkdeps.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.  */
static 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;

/* If -lang-fortran seen.  */
static bool lang_fortran = false;

/* 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_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;