As far as I know, there aren't any warning differences between -std=gnu99 and

-std=c99 modes, etc.

llvm-svn: 80133

clang/docs/UsersManual.html

@@ -596,7 +596,6 @@ variants "__asm__" and "__typeof__" are recognized in all modes.</li>
 <li>The Apple "blocks" extension is recognized by default in gnu* modes
 on some platforms; it can be enabled in any mode with the "-fblocks"
 option.</li>
-<li>Some warnings are different.</li>
 </ul>
 
 <p>Differences between *89 and *99 modes:</p>