From c07e547752171cafffdbae0c46f90251d266141b Mon Sep 17 00:00:00 2001
From: Nathan Sidwell <nathan@codesourcery.com>
Date: Sun, 6 Jul 2003 14:48:56 +0000
Subject: tree.h (default_flag_random_seed): Remove.

	* tree.h (default_flag_random_seed): Remove.
	* toplev.h (local_tick): Declare.
	* tree.c (flag_random_seed, default_flag_random_seed): Move to
	toplev.c.
	(append_random_chars): Don't call default_flag_random_seed.
	* toplev.c (flag_random_seed): Define here. Set local_tick.
	(local_tick): Define.
	(randomize): New, moved from tree.c.
	(print_switch_values): Adjust.
	(toplev_main): Call randomize.

From-SVN: r69005
---
 gcc/toplev.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 5 deletions(-)

(limited to 'gcc/toplev.c')

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 3337467..6351b69 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -463,6 +463,14 @@ int mem_report = 0;
    and to print them when we are done.  */
 int flag_detailed_statistics = 0;
 
+/* A random sequence of characters, unless overridden by user. */
+const char *flag_random_seed;
+
+/* A local time stamp derived from the time of compilation. It will be
+   zero if the system cannot provide a time.  It will be -1u, if the
+   user has specified a particular random seed.  */
+unsigned local_tick;
+
 /* -f flags.  */
 
 /* Nonzero means `char' should be signed.  */
@@ -1560,6 +1568,43 @@ FILE *asm_out_file;
 FILE *aux_info_file;
 FILE *rtl_dump_file = NULL;
 
+/* Set up a default flag_random_seed and local_tick, unless the user
+   already specified one.  */
+
+static void
+randomize (void)
+{
+  if (!flag_random_seed)
+    {
+      unsigned HOST_WIDE_INT value;
+      static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
+      
+      /* Get some more or less random data.  */
+#ifdef HAVE_GETTIMEOFDAY
+      {
+ 	struct timeval tv;
+ 	
+ 	gettimeofday (&tv, NULL);
+	local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
+      }
+#else
+      {
+	time_t now = time ();
+
+	if (now != (time_t)-1)
+	  local_tick = (unsigned) now;
+      }
+#endif
+      value = local_tick ^ getpid ();
+      
+      sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
+      flag_random_seed = random_seed;
+    }
+  else
+    local_tick = -1;
+}
+
+
 /* Decode the string P as an integral parameter.
    If the string is indeed an integer return its numeric value else
    issue an Invalid Option error for the option PNAME and return DEFVAL.
@@ -4394,13 +4439,10 @@ print_switch_values (FILE *file, int pos, int max,
   const char **p;
 
   /* Fill in the -frandom-seed option, if the user didn't pass it, so
-     that it can be printed below.  This helps reproducibility.  Of
-     course, the string may never be used, but we can't tell that at
-     this point in the compile.  */
-  default_flag_random_seed ();
+     that it can be printed below.  This helps reproducibility.  */
+  randomize ();
 
   /* Print the options as passed.  */
-
   pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
 			     _("options passed: "), "");
 
@@ -4969,6 +5011,8 @@ toplev_main (unsigned int argc, const char **argv)
      enough to default flags appropriately.  */
   decode_options (argc, argv);
 
+  randomize ();
+
   /* Exit early if we can (e.g. -help).  */
   if (!exit_after_options)
     do_compile ();
-- 
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