From: Andi Kleen <a...@linux.intel.com>
When available use /dev/urandom to get the random seem. This will lower the
probability
of collisions.
On other systems it will fallback to the old methods.
Passes bootstrap + testsuite on x86_64. Ok?
gcc/:
* 2011-09-26 Andi Kleen <a...@linux.intel.com>
* toplev.c (init_local_tick): Try reading random seed from /dev/urandom
---
gcc/toplev.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/gcc/toplev.c b/gcc/toplev.c
index e1a8b35..6298595 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -262,6 +262,12 @@ init_local_tick (void)
{
if (!flag_random_seed)
{
+ /* Try urandom first. Time of day is too likely to collide. */
+
+ int fd = open("/dev/urandom", O_RDONLY);
+ read(fd, &random_seed, sizeof(random_seed));
+ close(fd);
+
/* Get some more or less random data. */
#ifdef HAVE_GETTIMEOFDAY
{
--
1.7.5.4
