[PATCH] gcc/c-family/c-cppbuiltin.c: Use 20 instead of 18 for the maximized 64-bits integer decimal string length

[Chen Gang]

The maximize 64-bits integer decimal string length excluding NUL is 20 (
'-9223372036854775808'), so need use 20 instead of 18 for HOST_WIDE_INT.

2014-11-16  Chen Gang  <gang.chen.5...@gmail.com>

        * c-family/c-cppbuiltin.c (builtin_define_with_int_value):  Use
        20 instead of 18 for the maximize 64-bits integer decimal
        string length
---
 gcc/c-family/c-cppbuiltin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/c-family/c-cppbuiltin.c b/gcc/c-family/c-cppbuiltin.c
index 26fabc2..8e8cec4 100644
--- a/gcc/c-family/c-cppbuiltin.c
+++ b/gcc/c-family/c-cppbuiltin.c
@@ -1345,7 +1345,7 @@ builtin_define_with_int_value (const char *macro, 
HOST_WIDE_INT value)
 {
   char *buf;
   size_t mlen = strlen (macro);
-  size_t vlen = 18;
+  size_t vlen = 20; /* maximize value length: -9223372036854775808 */
   size_t extra = 2; /* space for = and NUL.  */
 
   buf = (char *) alloca (mlen + vlen + extra);
-- 
1.9.3