From 0aa36101f47857301dbfb1dd3e5e05aedb5cdd31 Mon Sep 17 00:00:00 2001
From: brianhall77 <brian.hall@gmail.com>
Date: Thu, 4 Jan 2018 16:03:03 -0800
Subject: [PATCH] Portable range check for *cursor_ value. (#4582)

Avoids the following compile error when char is unsigned:

error: comparison of unsigned expression >= 0 is always true [-Werror,-Wtautological-unsigned-zero-compare]
---
 src/idl_parser.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/idl_parser.cpp b/src/idl_parser.cpp
index dc8f58132..e89a39151 100644
--- a/src/idl_parser.cpp
+++ b/src/idl_parser.cpp
@@ -280,7 +280,7 @@ CheckedError Parser::Next() {
         int unicode_high_surrogate = -1;
 
         while (*cursor_ != c) {
-          if (*cursor_ < ' ' && *cursor_ >= 0)
+          if (*cursor_ < ' ' && static_cast<signed char>(*cursor_) >= 0)
             return Error("illegal character in string constant");
           if (*cursor_ == '\\') {
             cursor_++;