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

test/Driver/le32-unknown-nacl.cpp

 // RUN: %clang -ccc-host-triple le32-unknown-nacl -ccc-echo %s -emit-llvm -c 2>&1 | FileCheck %s -check-prefix=ECHO
 // RUN: %clang -ccc-host-triple le32-unknown-nacl %s -emit-llvm -S -c -o - | FileCheck %s
 
 // ECHO: clang{{.*}} -cc1 {{.*}}le32-unknown-nacl.c
 
 // Check platform defines
 #include <stddef.h>
 
 extern "C" {
 
 #ifdef __native_client__
 void __native_client__defined() {
   // CHECK: __native_client__defined
 }
 #endif
 
 #ifdef __le32__
 void __le32__defined() {
   // CHECK: __le32__defined
 }
 #endif
 
 #ifdef __pnacl__
 void __pnacl__defined() {
   // CHECK: __pnacl__defined
 }
 #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()
 char check_char() { return 0; }
 
 // CHECK: signext i16 @check_short()
 short check_short() { return 0; }
 
 // CHECK: i32 @check_int()
 int check_int() { return 0; }
@@ skipping 43 matching lines @@
 void check_pointer_size() {
   // CHECK: SwitchILi4
   Switch<sizeof(void*)>();
 
   // CHECK: SwitchILi8
   Switch<sizeof(long long)>();
 
   // CHECK: SwitchILi16
   Switch<sizeof(va_list)>();
 }
+
+#include <stdio.h>