2012-02-22 Hristian Kirtchev <kirtchev@adacore.com>

[pf3gnuchains/gcc-fork.git] / gcc / toplev.c

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 3688c09..c145af4 100644 (file)
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -141,15 +141,10 @@ static const char *flag_random_seed;
    user has specified a particular random seed.  */
 unsigned local_tick;
 
-/* -f flags.  */
-
-/* Generate code for GNU or NeXT Objective-C runtime environment.  */
+/* Random number for this compilation */
+HOST_WIDE_INT random_seed;
 
-#ifdef NEXT_OBJC_RUNTIME
-int flag_next_runtime = 1;
-#else
-int flag_next_runtime = 0;
-#endif
+/* -f flags.  */
 
 /* Nonzero means make permerror produce warnings instead of errors.  */
 
@@ -251,7 +246,7 @@ announce_function (tree decl)
     }
 }
 
-/* Initialize local_tick with the time of day, or -1 if
+/* Initialize local_tick with a random number or -1 if
    flag_random_seed is set.  */
 
 static void
@@ -259,7 +254,17 @@ init_local_tick (void)
 {
   if (!flag_random_seed)
     {
-      /* Get some more or less random data.  */
+      /* Try urandom first. Time of day is too likely to collide. 
+        In case of any error we just use the local tick. */
+
+      int fd = open ("/dev/urandom", O_RDONLY);
+      if (fd >= 0)
+        {
+          read (fd, &random_seed, sizeof (random_seed));
+          close (fd);
+        }
+
+      /* Now get the tick anyways  */
 #ifdef HAVE_GETTIMEOFDAY
       {
        struct timeval tv;
@@ -286,24 +291,28 @@ init_local_tick (void)
 static void
 init_random_seed (void)
 {
-  unsigned HOST_WIDE_INT value;
-  static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
-
-  value = local_tick ^ getpid ();
+  if (flag_random_seed)
+    {
+      char *endp;
 
-  sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
-  flag_random_seed = random_seed;
+      /* When the driver passed in a hex number don't crc it again */
+      random_seed = strtoul (flag_random_seed, &endp, 0);
+      if (!(endp > flag_random_seed && *endp == 0))
+        random_seed = crc32_string (0, flag_random_seed);
+    }
+  else if (!random_seed)
+    random_seed = local_tick ^ getpid ();  /* Old racey fallback method */
 }
 
-/* Obtain the random_seed string.  Unless NOINIT, initialize it if
+/* Obtain the random_seed.  Unless NOINIT, initialize it if
    it's not provided in the command line.  */
 
-const char *
+HOST_WIDE_INT
 get_random_seed (bool noinit)
 {
   if (!flag_random_seed && !noinit)
     init_random_seed ();
-  return flag_random_seed;
+  return random_seed;
 }
 
 /* Modify the random_seed string to VAL.  Return its previous
@@ -582,6 +591,7 @@ compile_file (void)
 
       output_shared_constant_pool ();
       output_object_blocks ();
+  finish_tm_clone_pairs ();
 
       /* Write out any pending weak symbol declarations.  */
       weak_finish ();
@@ -634,13 +644,13 @@ compile_file (void)
         {
 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
          ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
-                                         "__gnu_slim_lto",
+                                         "__gnu_lto_slim",
                                          (unsigned HOST_WIDE_INT) 1, 8);
 #elif defined ASM_OUTPUT_ALIGNED_COMMON
-         ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_slim_lto",
+         ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
                                     (unsigned HOST_WIDE_INT) 1, 8);
 #else
-         ASM_OUTPUT_COMMON (asm_out_file, "__gnu_slim_lto",
+         ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
                             (unsigned HOST_WIDE_INT) 1,
                             (unsigned HOST_WIDE_INT) 1);
 #endif
@@ -1154,6 +1164,9 @@ general_init (const char *argv0)
      can give warnings and errors.  */
   diagnostic_initialize (global_dc, N_OPTS);
   diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
+  /* By default print macro expansion contexts in the diagnostic
+     finalizer -- for tokens resulting from macro macro expansion.  */
+  diagnostic_finalizer (global_dc) = virt_loc_aware_diagnostic_finalizer;
   /* Set a default printer.  Language specific initializations will
      override it later.  */
   pp_format_decoder (global_dc->printer) = &default_tree_printer;
@@ -1196,6 +1209,7 @@ general_init (const char *argv0)
   line_table = ggc_alloc_line_maps ();
   linemap_init (line_table);
   line_table->reallocator = realloc_for_line_map;
+  line_table->round_alloc_size = ggc_round_alloc_size;
   init_ttree ();
 
   /* Initialize register usage now so switches may override.  */
@@ -1311,6 +1325,21 @@ process_options (void)
           "and -ftree-loop-linear)");
 #endif
 
+  if (flag_mudflap && flag_lto)
+    sorry ("mudflap cannot be used together with link-time optimization");
+
+  /* One region RA really helps to decrease the code size.  */
+  if (flag_ira_region == IRA_REGION_AUTODETECT)
+    flag_ira_region
+      = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
+
+  if (flag_strict_volatile_bitfields > 0 && !abi_version_at_least (2))
+    {
+      warning (0, "-fstrict-volatile-bitfields disabled; "
+              "it is incompatible with ABI versions < 2");
+      flag_strict_volatile_bitfields = 0;
+    }
+
   /* Unrolling all loops implies that standard loop unrolling must also
      be done.  */
   if (flag_unroll_all_loops)
@@ -1807,6 +1836,7 @@ target_reinit (void)
 void
 dump_memory_report (bool final)
 {
+  dump_line_table_statistics ();
   ggc_print_statistics ();
   stringpool_statistics ();
   dump_tree_statistics ();