PNaClTargetInfo: add __ELF__, _REENTRANT and _GNU_SOURCE defines and update the test.

test/Driver/le32-unknown-nacl.cpp

Index: test/Driver/le32-unknown-nacl.cpp
===================================================================
--- test/Driver/le32-unknown-nacl.cpp	(revision 138489)
+++ test/Driver/le32-unknown-nacl.cpp	(working copy)
@@ -26,6 +26,25 @@
 }
 #endif
 
+#ifdef unix
+void unixdefined() {
+  // CHECK: unixdefined
+}
+#endif
+
+#ifdef __ELF__
+void __ELF__defined() {
+  // CHECK: __ELF__defined
+}
+#endif
+
+#ifdef _GNU_SOURCE
+void _GNU_SOURCEdefined() {
+  // CHECK: _GNU_SOURCEdefined

[jvoung - send to chromium..., 2011/08/26 00:06:05]

Does this set Opts.CPlusPlus? I guess so.

To test _REENTRANT, can you run clang with the "-pthread" option?

+}
+#endif
+
+
 // Check types
 
 // CHECK: signext i8 @check_char()
@@ -89,3 +108,5 @@
   // CHECK: SwitchILi16
   Switch<sizeof(va_list)>();
 }
+
+#include <stdio.h>