Add stack protector support to clang. This generates the 'ssp' and 'sspreq'

function attributes. There are predefined macros that are defined when stack
protectors are used: __SSP__=1 with -fstack-protector and __SSP_ALL__=2 with
-fstack-protector-all.

llvm-svn: 74405

clang/lib/Frontend/InitPreprocessor.cpp

@@ -423,7 +423,12 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
   sprintf(MacroBuf, "__DECIMAL_DIG__=%d",
           PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36));
   DefineBuiltinMacro(Buf, MacroBuf);
-  
+
+  if (LangOpts.StackProtector == 1)
+    DefineBuiltinMacro(Buf, "__SSP__=1");
+  else if (LangOpts.StackProtector == 2)
+    DefineBuiltinMacro(Buf, "__SSP_ALL__=2");
+
   // Get other target #defines.
   TI.getTargetDefines(LangOpts, Buf);
 }