* genmodes.c (calc_wider_mode): Allocate enough room for all the

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

diff --git a/gcc/genmodes.c b/gcc/genmodes.c
index f9d4829..127392c 100644 (file)
--- a/gcc/genmodes.c
+++ b/gcc/genmodes.c
@@ -587,7 +587,9 @@ calc_wider_mode (void)
   for (c = 0; c < MAX_MODE_CLASS; c++)
     max_n_modes = MAX (max_n_modes, n_modes[c]);
 
-  sortbuf = alloca (max_n_modes * sizeof (struct mode_data *));
+  /* Allocate max_n_modes + 1 entries to leave room for the extra null
+     pointer assigned after the qsort call below.  */
+  sortbuf = alloca ((max_n_modes + 1) * sizeof (struct mode_data *));
 
   for (c = 0; c < MAX_MODE_CLASS; c++)
     {