[gcc r12-2373] Fix PR 101453: ICE with optimize and large integer constant

[gcc r12-2373] Fix PR 101453: ICE with optimize and large integer constant

[Andrew Pinski]

https://gcc.gnu.org/g:e06b1c5ac00b1bd0339739d3d9377c90852a83c9

commit r12-2373-ge06b1c5ac00b1bd0339739d3d9377c90852a83c9
Author: Andrew Pinski <apinski@marvell.com>
Date:   Thu Jul 15 18:07:09 2021 -0700

    Fix PR 101453: ICE with optimize and large integer constant
    
    The problem is the buffer is too small to hold "-O" and
    the interger.  This fixes the problem by use the correct size
    instead.
    
    Changes since v1:
    * v2: Use HOST_BITS_PER_LONG and just divide by 3 instead of
    3.32.
    
    OK? Bootstrapped and tested on x86_64-linux with no regressions.
    
    gcc/c-family/ChangeLog:
    
            PR c/101453
            * c-common.c (parse_optimize_options): Use the correct
            size for buffer.

Diff:
---
 gcc/c-family/c-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 681fcc972f4..fe3657b9e74 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -5798,7 +5798,7 @@ parse_optimize_options (tree args, bool attr_p)
 
       if (TREE_CODE (value) == INTEGER_CST)
 	{
-	  char buffer[20];
+	  char buffer[HOST_BITS_PER_LONG / 3 + 4];
 	  sprintf (buffer, "-O%ld", (long) TREE_INT_CST_LOW (value));
 	  vec_safe_push (optimize_args, ggc_strdup (buffer));
 	}