obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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files in the upstream repository.

1 files changed, 2014 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
new file mode 100644
index 000000000..9f9335653
--- /dev/null
+++ b/gcc/opts.c
@@ -0,0 +1,2014 @@
+/* Command line option handling.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+   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 "intl.h"
+#include "coretypes.h"
+#include "tm.h" /* Needed by rtl.h and used for STACK_CHECK_BUILTIN,
+		   STACK_CHECK_STATIC_BUILTIN, DEFAULT_GDB_EXTENSIONS,
+		   DWARF2_DEBUGGING_INFO and DBX_DEBUGGING_INFO.  */
+#include "rtl.h" /* Needed by insn-attr.h.  */
+#include "opts.h"
+#include "options.h"
+#include "flags.h"
+#include "params.h"
+#include "diagnostic.h"
+#include "opts-diagnostic.h"
+#include "insn-attr.h"		/* For INSN_SCHEDULING and DELAY_SLOTS.  */
+#include "target.h"
+
+/* Parse the -femit-struct-debug-detailed option value
+   and set the flag variables. */
+
+#define MATCH( prefix, string ) \
+  ((strncmp (prefix, string, sizeof prefix - 1) == 0) \
+   ? ((string += sizeof prefix - 1), 1) : 0)
+
+void
+set_struct_debug_option (struct gcc_options *opts, location_t loc,
+			 const char *spec)
+{
+  /* various labels for comparison */
+  static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
+  static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
+  static const char none_lbl[] = "none", any_lbl[] = "any";
+  static const char base_lbl[] = "base", sys_lbl[] = "sys";
+
+  enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
+  /* Default is to apply to as much as possible. */
+  enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
+  int ord = 1, gen = 1;
+
+  /* What usage? */
+  if (MATCH (dfn_lbl, spec))
+    usage = DINFO_USAGE_DFN;
+  else if (MATCH (dir_lbl, spec))
+    usage = DINFO_USAGE_DIR_USE;
+  else if (MATCH (ind_lbl, spec))
+    usage = DINFO_USAGE_IND_USE;
+
+  /* Generics or not? */
+  if (MATCH (ord_lbl, spec))
+    gen = 0;
+  else if (MATCH (gen_lbl, spec))
+    ord = 0;
+
+  /* What allowable environment? */
+  if (MATCH (none_lbl, spec))
+    files = DINFO_STRUCT_FILE_NONE;
+  else if (MATCH (any_lbl, spec))
+    files = DINFO_STRUCT_FILE_ANY;
+  else if (MATCH (sys_lbl, spec))
+    files = DINFO_STRUCT_FILE_SYS;
+  else if (MATCH (base_lbl, spec))
+    files = DINFO_STRUCT_FILE_BASE;
+  else
+    error_at (loc,
+	      "argument %qs to %<-femit-struct-debug-detailed%> "
+	      "not recognized",
+	      spec);
+
+  /* Effect the specification. */
+  if (usage == DINFO_USAGE_NUM_ENUMS)
+    {
+      if (ord)
+        {
+          opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
+          opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
+          opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
+        }
+      if (gen)
+        {
+          opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
+          opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
+          opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
+        }
+    }
+  else
+    {
+      if (ord)
+        opts->x_debug_struct_ordinary[usage] = files;
+      if (gen)
+        opts->x_debug_struct_generic[usage] = files;
+    }
+
+  if (*spec == ',')
+    set_struct_debug_option (opts, loc, spec+1);
+  else
+    {
+      /* No more -femit-struct-debug-detailed specifications.
+         Do final checks. */
+      if (*spec != '\0')
+	error_at (loc,
+		  "argument %qs to %<-femit-struct-debug-detailed%> unknown",
+		  spec);
+      if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
+		< opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
+	  || opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
+		< opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
+	error_at (loc,
+		  "%<-femit-struct-debug-detailed=dir:...%> must allow "
+		  "at least as much as "
+		  "%<-femit-struct-debug-detailed=ind:...%>");
+    }
+}
+
+/* Handle -ftree-vectorizer-verbose=VAL for options OPTS.  */
+
+static void
+vect_set_verbosity_level (struct gcc_options *opts, int val)
+{
+   if (val < MAX_VERBOSITY_LEVEL)
+     opts->x_user_vect_verbosity_level = (enum vect_verbosity_levels) val;
+   else
+     opts->x_user_vect_verbosity_level
+      = (enum vect_verbosity_levels) (MAX_VERBOSITY_LEVEL - 1);
+}
+
+
+/* Strip off a legitimate source ending from the input string NAME of
+   length LEN.  Rather than having to know the names used by all of
+   our front ends, we strip off an ending of a period followed by
+   up to five characters.  (Java uses ".class".)  */
+
+void
+strip_off_ending (char *name, int len)
+{
+  int i;
+  for (i = 2; i < 6 && len > i; i++)
+    {
+      if (name[len - i] == '.')
+	{
+	  name[len - i] = '\0';
+	  break;
+	}
+    }
+}
+
+/* Find the base name of a path, stripping off both directories and
+   a single final extension. */
+int
+base_of_path (const char *path, const char **base_out)
+{
+  const char *base = path;
+  const char *dot = 0;
+  const char *p = path;
+  char c = *p;
+  while (c)
+    {
+      if (IS_DIR_SEPARATOR(c))
+        {
+          base = p + 1;
+          dot = 0;
+        }
+      else if (c == '.')
+        dot = p;
+      c = *++p;
+    }
+  if (!dot)
+    dot = p;
+  *base_out = base;
+  return dot - base;
+}
+
+/* What to print when a switch has no documentation.  */
+static const char undocumented_msg[] = N_("This switch lacks documentation");
+
+typedef char *char_p; /* For DEF_VEC_P.  */
+DEF_VEC_P(char_p);
+DEF_VEC_ALLOC_P(char_p,heap);
+
+static void handle_param (struct gcc_options *opts,
+			  struct gcc_options *opts_set, location_t loc,
+			  const char *carg);
+static void set_debug_level (enum debug_info_type type, int extended,
+			     const char *arg, struct gcc_options *opts,
+			     struct gcc_options *opts_set,
+			     location_t loc);
+static void set_fast_math_flags (struct gcc_options *opts, int set);
+static void decode_d_option (const char *arg, struct gcc_options *opts,
+			     location_t loc, diagnostic_context *dc);
+static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
+						 int set);
+static void enable_warning_as_error (const char *arg, int value,
+				     unsigned int lang_mask,
+				     const struct cl_option_handlers *handlers,
+				     struct gcc_options *opts,
+				     struct gcc_options *opts_set,
+				     location_t loc,
+				     diagnostic_context *dc);
+
+/* Handle a back-end option; arguments and return value as for
+   handle_option.  */
+
+bool
+target_handle_option (struct gcc_options *opts,
+		      struct gcc_options *opts_set,
+		      const struct cl_decoded_option *decoded,
+		      unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
+		      location_t loc ATTRIBUTE_UNUSED,
+		      const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
+		      diagnostic_context *dc)
+{
+  gcc_assert (opts == &global_options);
+  gcc_assert (opts_set == &global_options_set);
+  gcc_assert (dc == global_dc);
+  gcc_assert (decoded->canonical_option_num_elements <= 2);
+  gcc_assert (kind == DK_UNSPECIFIED);
+  /* Although the location is not passed down to
+     targetm.handle_option, do not make assertions about its value;
+     options may come from optimize attributes and having the correct
+     location in the handler is not generally important.  */
+  return targetm.handle_option (decoded->opt_index, decoded->arg,
+				decoded->value);
+}
+
+/* Add comma-separated strings to a char_p vector.  */
+
+static void
+add_comma_separated_to_vector (void **pvec, const char *arg)
+{
+  char *tmp;
+  char *r;
+  char *w;
+  char *token_start;
+  VEC(char_p,heap) *vec = (VEC(char_p,heap) *) *pvec;
+
+  /* We never free this string.  */
+  tmp = xstrdup (arg);
+
+  r = tmp;
+  w = tmp;
+  token_start = tmp;
+
+  while (*r != '\0')
+    {
+      if (*r == ',')
+	{
+	  *w++ = '\0';
+	  ++r;
+	  VEC_safe_push (char_p, heap, vec, token_start);
+	  token_start = w;
+	}
+      if (*r == '\\' && r[1] == ',')
+	{
+	  *w++ = ',';
+	  r += 2;
+	}
+      else
+	*w++ = *r++;
+    }
+  if (*token_start != '\0')
+    VEC_safe_push (char_p, heap, vec, token_start);
+
+  *pvec = vec;
+}
+
+/* Initialize OPTS and OPTS_SET before using them in parsing options.  */
+
+void
+init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
+{
+  size_t num_params = get_num_compiler_params ();
+
+  *opts = global_options_init;
+  memset (opts_set, 0, sizeof (*opts_set));
+
+  opts->x_param_values = XNEWVEC (int, num_params);
+  opts_set->x_param_values = XCNEWVEC (int, num_params);
+  init_param_values (opts->x_param_values);
+
+  /* Use priority coloring if cover classes is not defined for the
+     target.  */
+  if (targetm.ira_cover_classes == NULL)
+    opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
+
+  /* Initialize whether `char' is signed.  */
+  opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
+  /* Set this to a special "uninitialized" value.  The actual default
+     is set after target options have been processed.  */
+  opts->x_flag_short_enums = 2;
+
+  /* Initialize target_flags before targetm.target_option.optimization
+     so the latter can modify it.  */
+  opts->x_target_flags = targetm.default_target_flags;
+
+  /* Some targets have ABI-specified unwind tables.  */
+  opts->x_flag_unwind_tables = targetm.unwind_tables_default;
+
+  /* Some targets have other target-specific initialization.  */
+  targetm.target_option.init_struct (opts);
+}
+
+/* If indicated by the optimization level LEVEL (-Os if SIZE is set,
+   -Ofast if FAST is set), apply the option DEFAULT_OPT to OPTS and
+   OPTS_SET, diagnostic context DC, location LOC, with language mask
+   LANG_MASK and option handlers HANDLERS.  */
+
+static void
+maybe_default_option (struct gcc_options *opts,
+		      struct gcc_options *opts_set,
+		      const struct default_options *default_opt,
+		      int level, bool size, bool fast,
+		      unsigned int lang_mask,
+		      const struct cl_option_handlers *handlers,
+		      location_t loc,
+		      diagnostic_context *dc)
+{
+  const struct cl_option *option = &cl_options[default_opt->opt_index];
+  bool enabled;
+
+  if (size)
+    gcc_assert (level == 2);
+  if (fast)
+    gcc_assert (level == 3);
+
+  switch (default_opt->levels)
+    {
+    case OPT_LEVELS_ALL:
+      enabled = true;
+      break;
+
+    case OPT_LEVELS_0_ONLY:
+      enabled = (level == 0);
+      break;
+
+    case OPT_LEVELS_1_PLUS:
+      enabled = (level >= 1);
+      break;
+
+    case OPT_LEVELS_1_PLUS_SPEED_ONLY:
+      enabled = (level >= 1 && !size);
+      break;
+
+    case OPT_LEVELS_2_PLUS:
+      enabled = (level >= 2);
+      break;
+
+    case OPT_LEVELS_2_PLUS_SPEED_ONLY:
+      enabled = (level >= 2 && !size);
+      break;
+
+    case OPT_LEVELS_3_PLUS:
+      enabled = (level >= 3);
+      break;
+
+    case OPT_LEVELS_3_PLUS_AND_SIZE:
+      enabled = (level >= 3 || size);
+      break;
+
+    case OPT_LEVELS_SIZE:
+      enabled = size;
+      break;
+
+    case OPT_LEVELS_FAST:
+      enabled = fast;
+      break;
+
+    case OPT_LEVELS_NONE:
+    default:
+      gcc_unreachable ();
+    }
+
+  if (enabled)
+    handle_generated_option (opts, opts_set, default_opt->opt_index,
+			     default_opt->arg, default_opt->value,
+			     lang_mask, DK_UNSPECIFIED, loc,
+			     handlers, dc);
+  else if (default_opt->arg == NULL
+	   && !(option->flags & CL_REJECT_NEGATIVE))
+    handle_generated_option (opts, opts_set, default_opt->opt_index,
+			     default_opt->arg, !default_opt->value,
+			     lang_mask, DK_UNSPECIFIED, loc,
+			     handlers, dc);
+}
+
+/* As indicated by the optimization level LEVEL (-Os if SIZE is set,
+   -Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
+   OPTS and OPTS_SET, diagnostic context DC, location LOC, with
+   language mask LANG_MASK and option handlers HANDLERS.  */
+
+static void
+maybe_default_options (struct gcc_options *opts,
+		       struct gcc_options *opts_set,
+		       const struct default_options *default_opts,
+		       int level, bool size, bool fast,
+		       unsigned int lang_mask,
+		       const struct cl_option_handlers *handlers,
+		       location_t loc,
+		       diagnostic_context *dc)
+{
+  size_t i;
+
+  for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
+    maybe_default_option (opts, opts_set, &default_opts[i],
+			  level, size, fast, lang_mask, handlers, loc, dc);
+}
+
+/* Table of options enabled by default at different levels.  */
+
+static const struct default_options default_options_table[] =
+  {
+    /* -O1 optimizations.  */
+    { OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
+#ifdef DELAY_SLOTS
+    { OPT_LEVELS_1_PLUS, OPT_fdelayed_branch, NULL, 1 },
+#endif
+    { OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fif_conversion, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fif_conversion2, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_bit_ccp, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_dse, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_sra, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_copyrename, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
+
+    /* -O2 optimizations.  */
+    { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
+#ifdef INSN_SCHEDULING
+  /* Only run the pre-regalloc scheduling pass if optimizing for speed.  */
+    { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
+#endif
+    { OPT_LEVELS_2_PLUS, OPT_fregmove, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fstrict_overflow, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_freorder_blocks, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_falign_loops, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_falign_jumps, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_falign_labels, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_falign_functions, NULL, 1 },
+
+    /* -O3 optimizations.  */
+    { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
+    /* Inlining of functions reducing size is a good idea with -Os
+       regardless of them being declared inline.  */
+    { OPT_LEVELS_3_PLUS_AND_SIZE, OPT_finline_functions, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_ftree_vectorize, NULL, 1 },
+    { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
+
+    /* -Ofast adds optimizations to -O3.  */
+    { OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
+
+    { OPT_LEVELS_NONE, 0, NULL, 0 }
+  };
+
+/* Default the options in OPTS and OPTS_SET based on the optimization
+   settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT.  */
+void
+default_options_optimization (struct gcc_options *opts,
+			      struct gcc_options *opts_set,
+			      struct cl_decoded_option *decoded_options,
+			      unsigned int decoded_options_count,
+			      location_t loc,
+			      unsigned int lang_mask,
+			      const struct cl_option_handlers *handlers,
+			      diagnostic_context *dc)
+{
+  unsigned int i;
+  int opt2;
+
+  /* Scan to see what optimization level has been specified.  That will
+     determine the default value of many flags.  */
+  for (i = 1; i < decoded_options_count; i++)
+    {
+      struct cl_decoded_option *opt = &decoded_options[i];
+      switch (opt->opt_index)
+	{
+	case OPT_O:
+	  if (*opt->arg == '\0')
+	    {
+	      opts->x_optimize = 1;
+	      opts->x_optimize_size = 0;
+	      opts->x_optimize_fast = 0;
+	    }
+	  else
+	    {
+	      const int optimize_val = integral_argument (opt->arg);
+	      if (optimize_val == -1)
+		error_at (loc,
+			  "argument to %qs should be a non-negative integer",
+			  "-O");
+	      else
+		{
+		  opts->x_optimize = optimize_val;
+		  if ((unsigned int) opts->x_optimize > 255)
+		    opts->x_optimize = 255;
+		  opts->x_optimize_size = 0;
+		  opts->x_optimize_fast = 0;
+		}
+	    }
+	  break;
+
+	case OPT_Os:
+	  opts->x_optimize_size = 1;
+
+	  /* Optimizing for size forces optimize to be 2.  */
+	  opts->x_optimize = 2;
+	  opts->x_optimize_fast = 0;
+	  break;
+
+	case OPT_Ofast:
+	  /* -Ofast only adds flags to -O3.  */
+	  opts->x_optimize_size = 0;
+	  opts->x_optimize = 3;
+	  opts->x_optimize_fast = 1;
+	  break;
+
+	default:
+	  /* Ignore other options in this prescan.  */
+	  break;
+	}
+    }
+
+  maybe_default_options (opts, opts_set, default_options_table,
+			 opts->x_optimize, opts->x_optimize_size,
+			 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
+
+  /* -O2 param settings.  */
+  opt2 = (opts->x_optimize >= 2);
+
+  /* Track fields in field-sensitive alias analysis.  */
+  maybe_set_param_value
+    (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
+     opt2 ? 100 : default_param_value (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE),
+     opts->x_param_values, opts_set->x_param_values);
+
+  /* For -O1 only do loop invariant motion for very small loops.  */
+  maybe_set_param_value
+    (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,
+     opt2 ? default_param_value (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP) : 1000,
+     opts->x_param_values, opts_set->x_param_values);
+
+  if (opts->x_optimize_size)
+    /* We want to crossjump as much as possible.  */
+    maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS, 1,
+			   opts->x_param_values, opts_set->x_param_values);
+  else
+    maybe_set_param_value (PARAM_MIN_CROSSJUMP_INSNS,
+			   default_param_value (PARAM_MIN_CROSSJUMP_INSNS),
+			   opts->x_param_values, opts_set->x_param_values);
+
+  /* Allow default optimizations to be specified on a per-machine basis.  */
+  maybe_default_options (opts, opts_set,
+			 targetm.target_option.optimization_table,
+			 opts->x_optimize, opts->x_optimize_size,
+			 opts->x_optimize_fast, lang_mask, handlers, loc, dc);
+}
+
+/* After all options at LOC have been read into OPTS and OPTS_SET,
+   finalize settings of those options and diagnose incompatible
+   combinations.  */
+void
+finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
+		location_t loc)
+{
+  enum unwind_info_type ui_except;
+
+  if (opts->x_dump_base_name && ! IS_ABSOLUTE_PATH (opts->x_dump_base_name))
+    {
+      /* First try to make OPTS->X_DUMP_BASE_NAME relative to the
+	 OPTS->X_DUMP_DIR_NAME directory.  Then try to make
+	 OPTS->X_DUMP_BASE_NAME relative to the OPTS->X_AUX_BASE_NAME
+	 directory, typically the directory to contain the object
+	 file.  */
+      if (opts->x_dump_dir_name)
+	opts->x_dump_base_name = concat (opts->x_dump_dir_name,
+					 opts->x_dump_base_name, NULL);
+      else if (opts->x_aux_base_name
+	       && strcmp (opts->x_aux_base_name, HOST_BIT_BUCKET) != 0)
+	{
+	  const char *aux_base;
+
+	  base_of_path (opts->x_aux_base_name, &aux_base);
+	  if (opts->x_aux_base_name != aux_base)
+	    {
+	      int dir_len = aux_base - opts->x_aux_base_name;
+	      char *new_dump_base_name =
+		XNEWVEC (char, strlen (opts->x_dump_base_name) + dir_len + 1);
+
+	      /* Copy directory component from OPTS->X_AUX_BASE_NAME.  */
+	      memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
+	      /* Append existing OPTS->X_DUMP_BASE_NAME.  */
+	      strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
+	      opts->x_dump_base_name = new_dump_base_name;
+	    }
+	}
+    }
+
+  /* Handle related options for unit-at-a-time, toplevel-reorder, and
+     section-anchors.  */
+  if (!opts->x_flag_unit_at_a_time)
+    {
+      if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
+	error_at (loc, "section anchors must be disabled when unit-at-a-time "
+		  "is disabled");
+      opts->x_flag_section_anchors = 0;
+      if (opts->x_flag_toplevel_reorder == 1)
+	error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
+		  "is disabled");
+      opts->x_flag_toplevel_reorder = 0;
+    }
+
+  /* -Wmissing-noreturn is alias for -Wsuggest-attribute=noreturn.  */
+  if (opts->x_warn_missing_noreturn)
+    opts->x_warn_suggest_attribute_noreturn = true;
+    
+  /* Unless the user has asked for section anchors, we disable toplevel
+     reordering at -O0 to disable transformations that might be surprising
+     to end users and to get -fno-toplevel-reorder tested.  */
+  if (!opts->x_optimize
+      && opts->x_flag_toplevel_reorder == 2
+      && !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
+    {
+      opts->x_flag_toplevel_reorder = 0;
+      opts->x_flag_section_anchors = 0;
+    }
+  if (!opts->x_flag_toplevel_reorder)
+    {
+      if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
+	error_at (loc, "section anchors must be disabled when toplevel reorder"
+		  " is disabled");
+      opts->x_flag_section_anchors = 0;
+    }
+
+  if (!opts->x_flag_opts_finished)
+    {
+      if (opts->x_flag_pie)
+	opts->x_flag_pic = opts->x_flag_pie;
+      if (opts->x_flag_pic && !opts->x_flag_pie)
+	opts->x_flag_shlib = 1;
+      opts->x_flag_opts_finished = true;
+    }
+
+  if (opts->x_optimize == 0)
+    {
+      /* Inlining does not work if not optimizing,
+	 so force it not to be done.  */
+      opts->x_warn_inline = 0;
+      opts->x_flag_no_inline = 1;
+    }
+
+  /* The optimization to partition hot and cold basic blocks into separate
+     sections of the .o and executable files does not work (currently)
+     with exception handling.  This is because there is no support for
+     generating unwind info.  If opts->x_flag_exceptions is turned on
+     we need to turn off the partitioning optimization.  */
+
+  ui_except = targetm.except_unwind_info (opts);
+
+  if (opts->x_flag_exceptions
+      && opts->x_flag_reorder_blocks_and_partition
+      && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
+    {
+      inform (loc,
+	      "-freorder-blocks-and-partition does not work "
+	      "with exceptions on this architecture");
+      opts->x_flag_reorder_blocks_and_partition = 0;
+      opts->x_flag_reorder_blocks = 1;
+    }
+
+  /* If user requested unwind info, then turn off the partitioning
+     optimization.  */
+
+  if (opts->x_flag_unwind_tables
+      && !targetm.unwind_tables_default
+      && opts->x_flag_reorder_blocks_and_partition
+      && (ui_except == UI_SJLJ || ui_except == UI_TARGET))
+    {
+      inform (loc,
+	      "-freorder-blocks-and-partition does not support "
+	      "unwind info on this architecture");
+      opts->x_flag_reorder_blocks_and_partition = 0;
+      opts->x_flag_reorder_blocks = 1;
+    }
+
+  /* If the target requested unwind info, then turn off the partitioning
+     optimization with a different message.  Likewise, if the target does not
+     support named sections.  */
+
+  if (opts->x_flag_reorder_blocks_and_partition
+      && (!targetm.have_named_sections
+	  || (opts->x_flag_unwind_tables
+	      && targetm.unwind_tables_default
+	      && (ui_except == UI_SJLJ || ui_except == UI_TARGET))))
+    {
+      inform (loc,
+	      "-freorder-blocks-and-partition does not work "
+	      "on this architecture");
+      opts->x_flag_reorder_blocks_and_partition = 0;
+      opts->x_flag_reorder_blocks = 1;
+    }
+
+  if (opts->x_flag_reorder_blocks_and_partition
+      && !opts_set->x_flag_reorder_functions)
+    opts->x_flag_reorder_functions = 1;
+
+  /* Pipelining of outer loops is only possible when general pipelining
+     capabilities are requested.  */
+  if (!opts->x_flag_sel_sched_pipelining)
+    opts->x_flag_sel_sched_pipelining_outer_loops = 0;
+
+  if (!targetm.ira_cover_classes
+      && opts->x_flag_ira_algorithm == IRA_ALGORITHM_CB)
+    {
+      inform (loc,
+	      "-fira-algorithm=CB does not work on this architecture");
+      opts->x_flag_ira_algorithm = IRA_ALGORITHM_PRIORITY;
+    }
+
+  if (opts->x_flag_conserve_stack)
+    {
+      maybe_set_param_value (PARAM_LARGE_STACK_FRAME, 100,
+			     opts->x_param_values, opts_set->x_param_values);
+      maybe_set_param_value (PARAM_STACK_FRAME_GROWTH, 40,
+			     opts->x_param_values, opts_set->x_param_values);
+    }
+  if (opts->x_flag_wpa || opts->x_flag_ltrans)
+    {
+      /* These passes are not WHOPR compatible yet.  */
+      opts->x_flag_ipa_pta = 0;
+      opts->x_flag_ipa_struct_reorg = 0;
+    }
+
+  if (opts->x_flag_lto)
+    {
+#ifdef ENABLE_LTO
+      opts->x_flag_generate_lto = 1;
+
+      /* When generating IL, do not operate in whole-program mode.
+	 Otherwise, symbols will be privatized too early, causing link
+	 errors later.  */
+      opts->x_flag_whole_program = 0;
+#else
+      error_at (loc, "LTO support has not been enabled in this configuration");
+#endif
+    }
+  if ((opts->x_flag_lto_partition_balanced != 0) + (opts->x_flag_lto_partition_1to1 != 0)
+       + (opts->x_flag_lto_partition_none != 0) >= 1)
+    {
+      if ((opts->x_flag_lto_partition_balanced != 0)
+	   + (opts->x_flag_lto_partition_1to1 != 0)
+	   + (opts->x_flag_lto_partition_none != 0) > 1)
+	error_at (loc, "only one -flto-partition value can be specified");
+    }
+
+  /* We initialize opts->x_flag_split_stack to -1 so that targets can set a
+     default value if they choose based on other options.  */
+  if (opts->x_flag_split_stack == -1)
+    opts->x_flag_split_stack = 0;
+  else if (opts->x_flag_split_stack)
+    {
+      if (!targetm.supports_split_stack (true, opts))
+	{
+	  error_at (loc, "%<-fsplit-stack%> is not supported by "
+		    "this compiler configuration");
+	  opts->x_flag_split_stack = 0;
+	}
+    }
+}
+
+#define LEFT_COLUMN	27
+
+/* Output ITEM, of length ITEM_WIDTH, in the left column,
+   followed by word-wrapped HELP in a second column.  */
+static void
+wrap_help (const char *help,
+	   const char *item,
+	   unsigned int item_width,
+	   unsigned int columns)
+{
+  unsigned int col_width = LEFT_COLUMN;
+  unsigned int remaining, room, len;
+
+  remaining = strlen (help);
+
+  do
+    {
+      room = columns - 3 - MAX (col_width, item_width);
+      if (room > columns)
+	room = 0;
+      len = remaining;
+
+      if (room < len)
+	{
+	  unsigned int i;
+
+	  for (i = 0; help[i]; i++)
+	    {
+	      if (i >= room && len != remaining)
+		break;
+	      if (help[i] == ' ')
+		len = i;
+	      else if ((help[i] == '-' || help[i] == '/')
+		       && help[i + 1] != ' '
+		       && i > 0 && ISALPHA (help[i - 1]))
+		len = i + 1;
+	    }
+	}
+
+      printf( "  %-*.*s %.*s\n", col_width, item_width, item, len, help);
+      item_width = 0;
+      while (help[len] == ' ')
+	len++;
+      help += len;
+      remaining -= len;
+    }
+  while (remaining);
+}
+
+/* Print help for a specific front-end, etc.  */
+static void
+print_filtered_help (unsigned int include_flags,
+		     unsigned int exclude_flags,
+		     unsigned int any_flags,
+		     unsigned int columns,
+		     struct gcc_options *opts,
+		     unsigned int lang_mask)
+{
+  unsigned int i;
+  const char *help;
+  bool found = false;
+  bool displayed = false;
+
+  if (include_flags == CL_PARAMS)
+    {
+      for (i = 0; i < LAST_PARAM; i++)
+	{
+	  const char *param = compiler_params[i].option;
+
+	  help = compiler_params[i].help;
+	  if (help == NULL || *help == '\0')
+	    {
+	      if (exclude_flags & CL_UNDOCUMENTED)
+		continue;
+	      help = undocumented_msg;
+	    }
+
+	  /* Get the translation.  */
+	  help = _(help);
+
+	  wrap_help (help, param, strlen (param), columns);
+	}
+      putchar ('\n');
+      return;
+    }
+
+  if (!opts->x_help_printed)
+    opts->x_help_printed = XCNEWVAR (char, cl_options_count);
+
+  if (!opts->x_help_enum_printed)
+    opts->x_help_enum_printed = XCNEWVAR (char, cl_enums_count);
+
+  for (i = 0; i < cl_options_count; i++)
+    {
+      char new_help[128];
+      const struct cl_option *option = cl_options + i;
+      unsigned int len;
+      const char *opt;
+      const char *tab;
+
+      if (include_flags == 0
+	  || ((option->flags & include_flags) != include_flags))
+	{
+	  if ((option->flags & any_flags) == 0)
+	    continue;
+	}
+
+      /* Skip unwanted switches.  */
+      if ((option->flags & exclude_flags) != 0)
+	continue;
+
+      /* The driver currently prints its own help text.  */
+      if ((option->flags & CL_DRIVER) != 0
+	  && (option->flags & (((1U << cl_lang_count) - 1)
+			       | CL_COMMON | CL_TARGET)) == 0)
+	continue;
+
+      found = true;
+      /* Skip switches that have already been printed.  */
+      if (opts->x_help_printed[i])
+	continue;
+
+      opts->x_help_printed[i] = true;
+
+      help = option->help;
+      if (help == NULL)
+	{
+	  if (exclude_flags & CL_UNDOCUMENTED)
+	    continue;
+	  help = undocumented_msg;
+	}
+
+      /* Get the translation.  */
+      help = _(help);
+
+      /* Find the gap between the name of the
+	 option and its descriptive text.  */
+      tab = strchr (help, '\t');
+      if (tab)
+	{
+	  len = tab - help;
+	  opt = help;
+	  help = tab + 1;
+	}
+      else
+	{
+	  opt = option->opt_text;
+	  len = strlen (opt);
+	}
+
+      /* With the -Q option enabled we change the descriptive text associated
+	 with an option to be an indication of its current setting.  */
+      if (!quiet_flag)
+	{
+	  void *flag_var = option_flag_var (i, opts);
+
+	  if (len < (LEFT_COLUMN + 2))
+	    strcpy (new_help, "\t\t");
+	  else
+	    strcpy (new_help, "\t");
+
+	  if (flag_var != NULL
+	      && option->var_type != CLVC_DEFER)
+	    {
+	      if (option->flags & CL_JOINED)
+		{
+		  if (option->var_type == CLVC_STRING)
+		    {
+		      if (* (const char **) flag_var != NULL)
+			snprintf (new_help + strlen (new_help),
+				  sizeof (new_help) - strlen (new_help),
+				  * (const char **) flag_var);
+		    }
+		  else if (option->var_type == CLVC_ENUM)
+		    {
+		      const struct cl_enum *e = &cl_enums[option->var_enum];
+		      int value;
+		      const char *arg = NULL;
+
+		      value = e->get (flag_var);
+		      enum_value_to_arg (e->values, &arg, value, lang_mask);
+		      if (arg == NULL)
+			arg = _("[default]");
+		      snprintf (new_help + strlen (new_help),
+				sizeof (new_help) - strlen (new_help),
+				arg);
+		    }
+		  else
+		    sprintf (new_help + strlen (new_help),
+			     "%#x", * (int *) flag_var);
+		}
+	      else
+		strcat (new_help, option_enabled (i, opts)
+			? _("[enabled]") : _("[disabled]"));
+	    }
+
+	  help = new_help;
+	}
+
+      wrap_help (help, opt, len, columns);
+      displayed = true;
+
+      if (option->var_type == CLVC_ENUM
+	  && opts->x_help_enum_printed[option->var_enum] != 2)
+	opts->x_help_enum_printed[option->var_enum] = 1;
+    }
+
+  if (! found)
+    {
+      unsigned int langs = include_flags & CL_LANG_ALL;
+
+      if (langs == 0)
+	printf (_(" No options with the desired characteristics were found\n"));
+      else
+	{
+	  unsigned int i;
+
+	  /* PR 31349: Tell the user how to see all of the
+	     options supported by a specific front end.  */
+	  for (i = 0; (1U << i) < CL_LANG_ALL; i ++)
+	    if ((1U << i) & langs)
+	      printf (_(" None found.  Use --help=%s to show *all* the options supported by the %s front-end\n"),
+		      lang_names[i], lang_names[i]);
+	}
+
+    }
+  else if (! displayed)
+    printf (_(" All options with the desired characteristics have already been displayed\n"));
+
+  putchar ('\n');
+
+  /* Print details of enumerated option arguments, if those
+     enumerations have help text headings provided.  If no help text
+     is provided, presume that the possible values are listed in the
+     help text for the relevant options.  */
+  for (i = 0; i < cl_enums_count; i++)
+    {
+      unsigned int j, pos;
+
+      if (opts->x_help_enum_printed[i] != 1)
+	continue;
+      if (cl_enums[i].help == NULL)
+	continue;
+      printf ("  %s\n    ", _(cl_enums[i].help));
+      pos = 4;
+      for (j = 0; cl_enums[i].values[j].arg != NULL; j++)
+	{
+	  unsigned int len = strlen (cl_enums[i].values[j].arg);
+
+	  if (pos > 4 && pos + 1 + len <= columns)
+	    {
+	      printf (" %s", cl_enums[i].values[j].arg);
+	      pos += 1 + len;
+	    }
+	  else
+	    {
+	      if (pos > 4)
+		{
+		  printf ("\n    ");
+		  pos = 4;
+		}
+	      printf ("%s", cl_enums[i].values[j].arg);
+	      pos += len;
+	    }
+	}
+      printf ("\n\n");
+      opts->x_help_enum_printed[i] = 2;
+    }
+}
+
+/* Display help for a specified type of option.
+   The options must have ALL of the INCLUDE_FLAGS set
+   ANY of the flags in the ANY_FLAGS set
+   and NONE of the EXCLUDE_FLAGS set.  The current option state is in
+   OPTS; LANG_MASK is used for interpreting enumerated option state.  */
+static void
+print_specific_help (unsigned int include_flags,
+		     unsigned int exclude_flags,
+		     unsigned int any_flags,
+		     struct gcc_options *opts,
+		     unsigned int lang_mask)
+{
+  unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
+  const char * description = NULL;
+  const char * descrip_extra = "";
+  size_t i;
+  unsigned int flag;
+
+  /* Sanity check: Make sure that we do not have more
+     languages than we have bits available to enumerate them.  */
+  gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS);
+
+  /* If we have not done so already, obtain
+     the desired maximum width of the output.  */
+  if (opts->x_help_columns == 0)
+    {
+      const char *p;
+
+      p = getenv ("COLUMNS");
+      if (p != NULL)
+	{
+	  int value = atoi (p);
+
+	  if (value > 0)
+	    opts->x_help_columns = value;
+	}
+
+      if (opts->x_help_columns == 0)
+	/* Use a reasonable default.  */
+	opts->x_help_columns = 80;
+    }
+
+  /* Decide upon the title for the options that we are going to display.  */
+  for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++)
+    {
+      switch (flag & include_flags)
+	{
+	case 0:
+	case CL_DRIVER:
+	  break;
+
+	case CL_TARGET:
+	  description = _("The following options are target specific");
+	  break;
+	case CL_WARNING:
+	  description = _("The following options control compiler warning messages");
+	  break;
+	case CL_OPTIMIZATION:
+	  description = _("The following options control optimizations");
+	  break;
+	case CL_COMMON:
+	  description = _("The following options are language-independent");
+	  break;
+	case CL_PARAMS:
+	  description = _("The --param option recognizes the following as parameters");
+	  break;
+	default:
+	  if (i >= cl_lang_count)
+	    break;
+	  if (exclude_flags & all_langs_mask)
+	    description = _("The following options are specific to just the language ");
+	  else
+	    description = _("The following options are supported by the language ");
+	  descrip_extra = lang_names [i];
+	  break;
+	}
+    }
+
+  if (description == NULL)
+    {
+      if (any_flags == 0)
+	{
+	  if (include_flags & CL_UNDOCUMENTED)
+	    description = _("The following options are not documented");
+	  else if (include_flags & CL_SEPARATE)
+	    description = _("The following options take separate arguments");
+	  else if (include_flags & CL_JOINED)
+	    description = _("The following options take joined arguments");
+	  else
+	    {
+	      internal_error ("unrecognized include_flags 0x%x passed to print_specific_help",
+			      include_flags);
+	      return;
+	    }
+	}
+      else
+	{
+	  if (any_flags & all_langs_mask)
+	    description = _("The following options are language-related");
+	  else
+	    description = _("The following options are language-independent");
+	}
+    }
+
+  printf ("%s%s:\n", description, descrip_extra);
+  print_filtered_help (include_flags, exclude_flags, any_flags,
+		       opts->x_help_columns, opts, lang_mask);
+}
+
+/* Handle target- and language-independent options.  Return zero to
+   generate an "unknown option" message.  Only options that need
+   extra handling need to be listed here; if you simply want
+   DECODED->value assigned to a variable, it happens automatically.  */
+
+bool
+common_handle_option (struct gcc_options *opts,
+		      struct gcc_options *opts_set,
+		      const struct cl_decoded_option *decoded,
+		      unsigned int lang_mask, int kind ATTRIBUTE_UNUSED,
+		      location_t loc,
+		      const struct cl_option_handlers *handlers,
+		      diagnostic_context *dc)
+{
+  size_t scode = decoded->opt_index;
+  const char *arg = decoded->arg;
+  int value = decoded->value;
+  enum opt_code code = (enum opt_code) scode;
+
+  gcc_assert (decoded->canonical_option_num_elements <= 2);
+
+  switch (code)
+    {
+    case OPT__param:
+      handle_param (opts, opts_set, loc, arg);
+      break;
+
+    case OPT__help:
+      {
+	unsigned int all_langs_mask = (1U << cl_lang_count) - 1;
+	unsigned int undoc_mask;
+	unsigned int i;
+
+	undoc_mask = ((opts->x_verbose_flag | opts->x_extra_warnings)
+		      ? 0
+		      : CL_UNDOCUMENTED);
+	/* First display any single language specific options.  */
+	for (i = 0; i < cl_lang_count; i++)
+	  print_specific_help
+	    (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0, opts,
+	     lang_mask);
+	/* Next display any multi language specific options.  */
+	print_specific_help (0, undoc_mask, all_langs_mask, opts, lang_mask);
+	/* Then display any remaining, non-language options.  */
+	for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1)
+	  if (i != CL_DRIVER)
+	    print_specific_help (i, undoc_mask, 0, opts, lang_mask);
+	opts->x_exit_after_options = true;
+	break;
+      }
+
+    case OPT__target_help:
+      print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0, opts, lang_mask);
+      opts->x_exit_after_options = true;
+
+      /* Allow the target a chance to give the user some additional information.  */
+      if (targetm.help)
+	targetm.help ();
+      break;
+
+    case OPT__help_:
+      {
+	const char * a = arg;
+	unsigned int include_flags = 0;
+	/* Note - by default we include undocumented options when listing
+	   specific classes.  If you only want to see documented options
+	   then add ",^undocumented" to the --help= option.  E.g.:
+
+	   --help=target,^undocumented  */
+	unsigned int exclude_flags = 0;
+
+	/* Walk along the argument string, parsing each word in turn.
+	   The format is:
+	   arg = [^]{word}[,{arg}]
+	   word = {optimizers|target|warnings|undocumented|
+		   params|common|<language>}  */
+	while (* a != 0)
+	  {
+	    static const struct
+	    {
+	      const char * string;
+	      unsigned int flag;
+	    }
+	    specifics[] =
+	    {
+	      { "optimizers", CL_OPTIMIZATION },
+	      { "target", CL_TARGET },
+	      { "warnings", CL_WARNING },
+	      { "undocumented", CL_UNDOCUMENTED },
+	      { "params", CL_PARAMS },
+	      { "joined", CL_JOINED },
+	      { "separate", CL_SEPARATE },
+	      { "common", CL_COMMON },
+	      { NULL, 0 }
+	    };
+	    unsigned int * pflags;
+	    const char * comma;
+	    unsigned int lang_flag, specific_flag;
+	    unsigned int len;
+	    unsigned int i;
+
+	    if (* a == '^')
+	      {
+		++ a;
+		pflags = & exclude_flags;
+	      }
+	    else
+	      pflags = & include_flags;
+
+	    comma = strchr (a, ',');
+	    if (comma == NULL)
+	      len = strlen (a);
+	    else
+	      len = comma - a;
+	    if (len == 0)
+	      {
+		a = comma + 1;
+		continue;
+	      }
+
+	    /* Check to see if the string matches an option class name.  */
+	    for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++)
+	      if (strncasecmp (a, specifics[i].string, len) == 0)
+		{
+		  specific_flag = specifics[i].flag;
+		  break;
+		}
+
+	    /* Check to see if the string matches a language name.
+	       Note - we rely upon the alpha-sorted nature of the entries in
+	       the lang_names array, specifically that shorter names appear
+	       before their longer variants.  (i.e. C before C++).  That way
+	       when we are attempting to match --help=c for example we will
+	       match with C first and not C++.  */
+	    for (i = 0, lang_flag = 0; i < cl_lang_count; i++)
+	      if (strncasecmp (a, lang_names[i], len) == 0)
+		{
+		  lang_flag = 1U << i;
+		  break;
+		}
+
+	    if (specific_flag != 0)
+	      {
+		if (lang_flag == 0)
+		  * pflags |= specific_flag;
+		else
+		  {
+		    /* The option's argument matches both the start of a
+		       language name and the start of an option class name.
+		       We have a special case for when the user has
+		       specified "--help=c", but otherwise we have to issue
+		       a warning.  */
+		    if (strncasecmp (a, "c", len) == 0)
+		      * pflags |= lang_flag;
+		    else
+		      warning_at (loc, 0,
+				  "--help argument %q.*s is ambiguous, "
+				  "please be more specific",
+				  len, a);
+		  }
+	      }
+	    else if (lang_flag != 0)
+	      * pflags |= lang_flag;
+	    else
+	      warning_at (loc, 0,
+			  "unrecognized argument to --help= option: %q.*s",
+			  len, a);
+
+	    if (comma == NULL)
+	      break;
+	    a = comma + 1;
+	  }
+
+	if (include_flags)
+	  print_specific_help (include_flags, exclude_flags, 0, opts,
+			       lang_mask);
+	opts->x_exit_after_options = true;
+	break;
+      }
+
+    case OPT__version:
+      opts->x_exit_after_options = true;
+      break;
+
+    case OPT_O:
+    case OPT_Os:
+    case OPT_Ofast:
+      /* Currently handled in a prescan.  */
+      break;
+
+    case OPT_Werror_:
+      enable_warning_as_error (arg, value, lang_mask, handlers,
+			       opts, opts_set, loc, dc);
+      break;
+
+    case OPT_Wlarger_than_:
+      opts->x_larger_than_size = value;
+      opts->x_warn_larger_than = value != -1;
+      break;
+
+    case OPT_Wfatal_errors:
+      dc->fatal_errors = value;
+      break;
+
+    case OPT_Wframe_larger_than_:
+      opts->x_frame_larger_than_size = value;
+      opts->x_warn_frame_larger_than = value != -1;
+      break;
+
+    case OPT_Wstrict_aliasing:
+      set_Wstrict_aliasing (opts, value);
+      break;
+
+    case OPT_Wstrict_overflow:
+      opts->x_warn_strict_overflow = (value
+				      ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL
+				      : 0);
+      break;
+
+    case OPT_Wsystem_headers:
+      dc->dc_warn_system_headers = value;
+      break;
+
+    case OPT_aux_info:
+      opts->x_flag_gen_aux_info = 1;
+      break;
+
+    case OPT_auxbase_strip:
+      {
+	char *tmp = xstrdup (arg);
+	strip_off_ending (tmp, strlen (tmp));
+	if (tmp[0])
+	  opts->x_aux_base_name = tmp;
+      }
+      break;
+
+    case OPT_d:
+      decode_d_option (arg, opts, loc, dc);
+      break;
+
+    case OPT_fcall_used_:
+    case OPT_fcall_saved_:
+      /* Deferred.  */
+      break;
+
+    case OPT_fdbg_cnt_:
+    case OPT_fdbg_cnt_list:
+      /* Deferred.  */
+      break;
+
+    case OPT_fdebug_prefix_map_:
+      /* Deferred.  */
+      break;
+
+    case OPT_fdiagnostics_show_location_:
+      diagnostic_prefixing_rule (dc) = (diagnostic_prefixing_rule_t) value;
+      break;
+
+    case OPT_fdiagnostics_show_option:
+      dc->show_option_requested = value;
+      break;
+
+    case OPT_fdump_:
+      /* Deferred.  */
+      break;
+
+    case OPT_ffast_math:
+      set_fast_math_flags (opts, value);
+      break;
+
+    case OPT_funsafe_math_optimizations:
+      set_unsafe_math_optimizations_flags (opts, value);
+      break;
+
+    case OPT_ffixed_:
+      /* Deferred.  */
+      break;
+
+    case OPT_finline_limit_:
+      set_param_value ("max-inline-insns-single", value / 2,
+		       opts->x_param_values, opts_set->x_param_values);
+      set_param_value ("max-inline-insns-auto", value / 2,
+		       opts->x_param_values, opts_set->x_param_values);
+      break;
+
+    case OPT_finstrument_functions_exclude_function_list_:
+      add_comma_separated_to_vector
+	(&opts->x_flag_instrument_functions_exclude_functions, arg);
+      break;
+
+    case OPT_finstrument_functions_exclude_file_list_:
+      add_comma_separated_to_vector
+	(&opts->x_flag_instrument_functions_exclude_files, arg);
+      break;
+
+    case OPT_fmessage_length_:
+      pp_set_line_maximum_length (dc->printer, value);
+      break;
+
+    case OPT_fpack_struct_:
+      if (value <= 0 || (value & (value - 1)) || value > 16)
+	error_at (loc,
+		  "structure alignment must be a small power of two, not %d",
+		  value);
+      else
+	opts->x_initial_max_fld_align = value;
+      break;
+
+    case OPT_fplugin_:
+    case OPT_fplugin_arg_:
+      /* Deferred.  */
+      break;
+
+    case OPT_fprofile_use_:
+      opts->x_profile_data_prefix = xstrdup (arg);
+      opts->x_flag_profile_use = true;
+      value = true;
+      /* No break here - do -fprofile-use processing. */
+    case OPT_fprofile_use:
+      if (!opts_set->x_flag_branch_probabilities)
+	opts->x_flag_branch_probabilities = value;
+      if (!opts_set->x_flag_profile_values)
+	opts->x_flag_profile_values = value;
+      if (!opts_set->x_flag_unroll_loops)
+	opts->x_flag_unroll_loops = value;
+      if (!opts_set->x_flag_peel_loops)
+	opts->x_flag_peel_loops = value;
+      if (!opts_set->x_flag_tracer)
+	opts->x_flag_tracer = value;
+      if (!opts_set->x_flag_value_profile_transformations)
+	opts->x_flag_value_profile_transformations = value;
+      if (!opts_set->x_flag_inline_functions)
+	opts->x_flag_inline_functions = value;
+      if (!opts_set->x_flag_ipa_cp)
+	opts->x_flag_ipa_cp = value;
+      if (!opts_set->x_flag_ipa_cp_clone
+	  && value && opts->x_flag_ipa_cp)
+	opts->x_flag_ipa_cp_clone = value;
+      if (!opts_set->x_flag_predictive_commoning)
+	opts->x_flag_predictive_commoning = value;
+      if (!opts_set->x_flag_unswitch_loops)
+	opts->x_flag_unswitch_loops = value;
+      if (!opts_set->x_flag_gcse_after_reload)
+	opts->x_flag_gcse_after_reload = value;
+      break;
+
+    case OPT_fprofile_generate_:
+      opts->x_profile_data_prefix = xstrdup (arg);
+      value = true;
+      /* No break here - do -fprofile-generate processing. */
+    case OPT_fprofile_generate:
+      if (!opts_set->x_profile_arc_flag)
+	opts->x_profile_arc_flag = value;
+      if (!opts_set->x_flag_profile_values)
+	opts->x_flag_profile_values = value;
+      if (!opts_set->x_flag_value_profile_transformations)
+	opts->x_flag_value_profile_transformations = value;
+      if (!opts_set->x_flag_inline_functions)
+	opts->x_flag_inline_functions = value;
+      /* FIXME: Instrumentation we insert makes ipa-reference bitmaps
+	 quadratic.  Disable the pass until better memory representation
+	 is done.  */
+      if (!opts_set->x_flag_ipa_reference && in_lto_p)
+        opts->x_flag_ipa_reference = false;
+      break;
+
+    case OPT_fshow_column:
+      dc->show_column = value;
+      break;
+
+    case OPT_frandom_seed:
+      /* The real switch is -fno-random-seed.  */
+      if (value)
+	return false;
+      /* Deferred.  */
+      break;
+
+    case OPT_frandom_seed_:
+      /* Deferred.  */
+      break;
+
+    case OPT_fsched_verbose_:
+#ifdef INSN_SCHEDULING
+      /* Handled with Var in common.opt.  */
+      break;
+#else
+      return false;
+#endif
+
+    case OPT_fsched_stalled_insns_:
+      opts->x_flag_sched_stalled_insns = value;
+      if (opts->x_flag_sched_stalled_insns == 0)
+	opts->x_flag_sched_stalled_insns = -1;
+      break;
+
+    case OPT_fsched_stalled_insns_dep_:
+      opts->x_flag_sched_stalled_insns_dep = value;
+      break;
+
+    case OPT_fstack_check_:
+      if (!strcmp (arg, "no"))
+	opts->x_flag_stack_check = NO_STACK_CHECK;
+      else if (!strcmp (arg, "generic"))
+	/* This is the old stack checking method.  */
+	opts->x_flag_stack_check = STACK_CHECK_BUILTIN
+			   ? FULL_BUILTIN_STACK_CHECK
+			   : GENERIC_STACK_CHECK;
+      else if (!strcmp (arg, "specific"))
+	/* This is the new stack checking method.  */
+	opts->x_flag_stack_check = STACK_CHECK_BUILTIN
+			   ? FULL_BUILTIN_STACK_CHECK
+			   : STACK_CHECK_STATIC_BUILTIN
+			     ? STATIC_BUILTIN_STACK_CHECK
+			     : GENERIC_STACK_CHECK;
+      else
+	warning_at (loc, 0, "unknown stack check parameter \"%s\"", arg);
+      break;
+
+    case OPT_fstack_limit:
+      /* The real switch is -fno-stack-limit.  */
+      if (value)
+	return false;
+      /* Deferred.  */
+      break;
+
+    case OPT_fstack_limit_register_:
+    case OPT_fstack_limit_symbol_:
+      /* Deferred.  */
+      break;
+
+    case OPT_ftree_vectorizer_verbose_:
+      vect_set_verbosity_level (opts, value);
+      break;
+
+    case OPT_g:
+      set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg, opts, opts_set,
+		       loc);
+      break;
+
+    case OPT_gcoff:
+      set_debug_level (SDB_DEBUG, false, arg, opts, opts_set, loc);
+      break;
+
+    case OPT_gdwarf_:
+      if (value < 2 || value > 4)
+	error_at (loc, "dwarf version %d is not supported", value);
+      else
+	dwarf_version = value;
+      set_debug_level (DWARF2_DEBUG, false, "", opts, opts_set, loc);
+      break;
+
+    case OPT_ggdb:
+      set_debug_level (NO_DEBUG, 2, arg, opts, opts_set, loc);
+      break;
+
+    case OPT_gstabs:
+    case OPT_gstabs_:
+      set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg, opts, opts_set,
+		       loc);
+      break;
+
+    case OPT_gvms:
+      set_debug_level (VMS_DEBUG, false, arg, opts, opts_set, loc);
+      break;
+
+    case OPT_gxcoff:
+    case OPT_gxcoff_:
+      set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg, opts, opts_set,
+		       loc);
+      break;
+
+    case OPT_pedantic_errors:
+      opts->x_pedantic = 1;
+      dc->pedantic_errors = 1;
+      break;
+
+    case OPT_flto:
+      opts->x_flag_lto = value ? "" : NULL;
+      break;
+
+    case OPT_w:
+      dc->dc_inhibit_warnings = true;
+      break;
+
+    case OPT_fmax_errors_:
+      dc->max_errors = value;
+      break;
+
+    case OPT_fuse_linker_plugin:
+      /* No-op. Used by the driver and passed to us because it starts with f.*/
+      break;
+
+    default:
+      /* If the flag was handled in a standard way, assume the lack of
+	 processing here is intentional.  */
+      gcc_assert (option_flag_var (scode, opts));
+      break;
+    }
+
+  return true;
+}
+
+/* Handle --param NAME=VALUE.  */
+static void
+handle_param (struct gcc_options *opts, struct gcc_options *opts_set,
+	      location_t loc, const char *carg)
+{
+  char *equal, *arg;
+  int value;
+
+  arg = xstrdup (carg);
+  equal = strchr (arg, '=');
+  if (!equal)
+    error_at (loc, "%s: --param arguments should be of the form NAME=VALUE",
+	      arg);
+  else
+    {
+      value = integral_argument (equal + 1);
+      if (value == -1)
+	error_at (loc, "invalid --param value %qs", equal + 1);
+      else
+	{
+	  *equal = '\0';
+	  set_param_value (arg, value,
+			   opts->x_param_values, opts_set->x_param_values);
+	}
+    }
+
+  free (arg);
+}
+
+/* Used to set the level of strict aliasing warnings in OPTS,
+   when no level is specified (i.e., when -Wstrict-aliasing, and not
+   -Wstrict-aliasing=level was given).
+   ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
+   and 0 otherwise.  After calling this function, wstrict_aliasing will be
+   set to the default value of -Wstrict_aliasing=level, currently 3.  */
+void
+set_Wstrict_aliasing (struct gcc_options *opts, int onoff)
+{
+  gcc_assert (onoff == 0 || onoff == 1);
+  if (onoff != 0)
+    opts->x_warn_strict_aliasing = 3;
+  else
+    opts->x_warn_strict_aliasing = 0;
+}
+
+/* The following routines are useful in setting all the flags that
+   -ffast-math and -fno-fast-math imply.  */
+static void
+set_fast_math_flags (struct gcc_options *opts, int set)
+{
+  if (!opts->frontend_set_flag_unsafe_math_optimizations)
+    {
+      opts->x_flag_unsafe_math_optimizations = set;
+      set_unsafe_math_optimizations_flags (opts, set);
+    }
+  if (!opts->frontend_set_flag_finite_math_only)
+    opts->x_flag_finite_math_only = set;
+  if (!opts->frontend_set_flag_errno_math)
+    opts->x_flag_errno_math = !set;
+  if (set)
+    {
+      if (!opts->frontend_set_flag_signaling_nans)
+	opts->x_flag_signaling_nans = 0;
+      if (!opts->frontend_set_flag_rounding_math)
+	opts->x_flag_rounding_math = 0;
+      if (!opts->frontend_set_flag_cx_limited_range)
+	opts->x_flag_cx_limited_range = 1;
+    }
+}
+
+/* When -funsafe-math-optimizations is set the following
+   flags are set as well.  */
+static void
+set_unsafe_math_optimizations_flags (struct gcc_options *opts, int set)
+{
+  if (!opts->frontend_set_flag_trapping_math)
+    opts->x_flag_trapping_math = !set;
+  if (!opts->frontend_set_flag_signed_zeros)
+    opts->x_flag_signed_zeros = !set;
+  if (!opts->frontend_set_flag_associative_math)
+    opts->x_flag_associative_math = set;
+  if (!opts->frontend_set_flag_reciprocal_math)
+    opts->x_flag_reciprocal_math = set;
+}
+
+/* Return true iff flags in OPTS are set as if -ffast-math.  */
+bool
+fast_math_flags_set_p (const struct gcc_options *opts)
+{
+  return (!opts->x_flag_trapping_math
+	  && opts->x_flag_unsafe_math_optimizations
+	  && opts->x_flag_finite_math_only
+	  && !opts->x_flag_signed_zeros
+	  && !opts->x_flag_errno_math);
+}
+
+/* Return true iff flags are set as if -ffast-math but using the flags stored
+   in the struct cl_optimization structure.  */
+bool
+fast_math_flags_struct_set_p (struct cl_optimization *opt)
+{
+  return (!opt->x_flag_trapping_math
+	  && opt->x_flag_unsafe_math_optimizations
+	  && opt->x_flag_finite_math_only
+	  && !opt->x_flag_signed_zeros
+	  && !opt->x_flag_errno_math);
+}
+
+/* Handle a debug output -g switch for options OPTS
+   (OPTS_SET->x_write_symbols storing whether a debug type was passed
+   explicitly), location LOC.  EXTENDED is true or false to support
+   extended output (2 is special and means "-ggdb" was given).  */
+static void
+set_debug_level (enum debug_info_type type, int extended, const char *arg,
+		 struct gcc_options *opts, struct gcc_options *opts_set,
+		 location_t loc)
+{
+  opts->x_use_gnu_debug_info_extensions = extended;
+
+  if (type == NO_DEBUG)
+    {
+      if (opts->x_write_symbols == NO_DEBUG)
+	{
+	  opts->x_write_symbols = PREFERRED_DEBUGGING_TYPE;
+
+	  if (extended == 2)
+	    {
+#ifdef DWARF2_DEBUGGING_INFO
+	      opts->x_write_symbols = DWARF2_DEBUG;
+#elif defined DBX_DEBUGGING_INFO
+	      opts->x_write_symbols = DBX_DEBUG;
+#endif
+	    }
+
+	  if (opts->x_write_symbols == NO_DEBUG)
+	    warning_at (loc, 0, "target system does not support debug output");
+	}
+    }
+  else
+    {
+      /* Does it conflict with an already selected type?  */
+      if (opts_set->x_write_symbols != NO_DEBUG
+	  && opts->x_write_symbols != NO_DEBUG
+	  && type != opts->x_write_symbols)
+	error_at (loc, "debug format \"%s\" conflicts with prior selection",
+		  debug_type_names[type]);
+      opts->x_write_symbols = type;
+      opts_set->x_write_symbols = type;
+    }
+
+  /* A debug flag without a level defaults to level 2.  */
+  if (*arg == '\0')
+    {
+      if (!opts->x_debug_info_level)
+	opts->x_debug_info_level = DINFO_LEVEL_NORMAL;
+    }
+  else
+    {
+      int argval = integral_argument (arg);
+      if (argval == -1)
+	error_at (loc, "unrecognised debug output level \"%s\"", arg);
+      else if (argval > 3)
+	error_at (loc, "debug output level %s is too high", arg);
+      else
+	opts->x_debug_info_level = (enum debug_info_levels) argval;
+    }
+}
+
+/* Arrange to dump core on error for diagnostic context DC.  (The
+   regular error message is still printed first, except in the case of
+   abort ().)  */
+
+static void
+setup_core_dumping (diagnostic_context *dc)
+{
+#ifdef SIGABRT
+  signal (SIGABRT, SIG_DFL);
+#endif
+#if defined(HAVE_SETRLIMIT)
+  {
+    struct rlimit rlim;
+    if (getrlimit (RLIMIT_CORE, &rlim) != 0)
+      fatal_error ("getting core file size maximum limit: %m");
+    rlim.rlim_cur = rlim.rlim_max;
+    if (setrlimit (RLIMIT_CORE, &rlim) != 0)
+      fatal_error ("setting core file size limit to maximum: %m");
+  }
+#endif
+  diagnostic_abort_on_error (dc);
+}
+
+/* Parse a -d<ARG> command line switch for OPTS, location LOC,
+   diagnostic context DC.  */
+
+static void
+decode_d_option (const char *arg, struct gcc_options *opts,
+		 location_t loc, diagnostic_context *dc)
+{
+  int c;
+
+  while (*arg)
+    switch (c = *arg++)
+      {
+      case 'A':
+	opts->x_flag_debug_asm = 1;
+	break;
+      case 'p':
+	opts->x_flag_print_asm_name = 1;
+	break;
+      case 'P':
+	opts->x_flag_dump_rtl_in_asm = 1;
+	opts->x_flag_print_asm_name = 1;
+	break;
+      case 'v':
+	opts->x_graph_dump_format = vcg;
+	break;
+      case 'x':
+	opts->x_rtl_dump_and_exit = 1;
+	break;
+      case 'D':	/* These are handled by the preprocessor.  */
+      case 'I':
+      case 'M':
+      case 'N':
+      case 'U':
+	break;
+      case 'H':
+	setup_core_dumping (dc);
+	break;
+      case 'a':
+	opts->x_flag_dump_all_passed = true;
+	break;
+
+      default:
+	  warning_at (loc, 0, "unrecognized gcc debugging option: %c", c);
+	break;
+      }
+}
+
+/* Enable (or disable if VALUE is 0) a warning option ARG (language
+   mask LANG_MASK, option handlers HANDLERS) as an error for option
+   structures OPTS and OPTS_SET, diagnostic context DC (possibly
+   NULL), location LOC.  This is used by -Werror=.  */
+
+static void
+enable_warning_as_error (const char *arg, int value, unsigned int lang_mask,
+			 const struct cl_option_handlers *handlers,
+			 struct gcc_options *opts,
+			 struct gcc_options *opts_set,
+			 location_t loc, diagnostic_context *dc)
+{
+  char *new_option;
+  int option_index;
+
+  new_option = XNEWVEC (char, strlen (arg) + 2);
+  new_option[0] = 'W';
+  strcpy (new_option + 1, arg);
+  option_index = find_opt (new_option, lang_mask);
+  if (option_index == OPT_SPECIAL_unknown)
+    {
+      error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
+    }
+  else
+    {
+      const diagnostic_t kind = value ? DK_ERROR : DK_WARNING;
+
+      control_warning_option (option_index, (int) kind, value,
+			      loc, lang_mask,
+			      handlers, opts, opts_set, dc);
+    }
+  free (new_option);
+}
+
+/* Return malloced memory for the name of the option OPTION_INDEX
+   which enabled a diagnostic (context CONTEXT), originally of type
+   ORIG_DIAG_KIND but possibly converted to DIAG_KIND by options such
+   as -Werror.  */
+
+char *
+option_name (diagnostic_context *context, int option_index,
+	     diagnostic_t orig_diag_kind, diagnostic_t diag_kind)
+{
+  if (option_index)
+    {
+      /* A warning classified as an error.  */
+      if ((orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN)
+	  && diag_kind == DK_ERROR)
+	return concat (cl_options[OPT_Werror_].opt_text,
+		       /* Skip over "-W".  */
+		       cl_options[option_index].opt_text + 2,
+		       NULL);
+      /* A warning with option.  */
+      else
+	return xstrdup (cl_options[option_index].opt_text);
+    }
+  /* A warning without option classified as an error.  */
+  else if (orig_diag_kind == DK_WARNING || orig_diag_kind == DK_PEDWARN
+	   || diag_kind == DK_WARNING)
+    {
+      if (context->warning_as_error_requested)
+	return xstrdup (cl_options[OPT_Werror].opt_text);
+      else
+	return xstrdup (_("enabled by default"));
+    }
+  else
+    return NULL;
+}