Properly factor Native Client defines to support NaCl OS on ARM and x86

test/Driver/x86_64-nacl-defines.cpp

Index: test/Driver/x86_64-nacl-defines.cpp
diff --git a/test/Driver/x86_64-nacl-defines.cpp b/test/Driver/x86_64-nacl-defines.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..caa9a74d2db64020597e5c274b8f577b00bb9231
--- /dev/null
+++ b/test/Driver/x86_64-nacl-defines.cpp
@@ -0,0 +1,45 @@
+// RUN: %clang -target x86_64-unknown-nacl -ccc-echo %s -emit-llvm-only -c 2>&1 | FileCheck %s -check-prefix=ECHO
+// RUN: %clang -target x86_64-unknown-nacl %s -emit-llvm -S -c -o - | FileCheck %s
+// RUN: %clang -target x86_64-unknown-nacl %s -emit-llvm -S -c -pthread -o - | FileCheck %s -check-prefix=THREADS
+
+// ECHO: {{.*}} -cc1 {{.*}}x86_64-nacl-defines.c
+
+// Check platform defines
+
+// CHECK: __LITTLE_ENDIAN__defined
+#ifdef __LITTLE_ENDIAN__
+void __LITTLE_ENDIAN__defined() {}
+#endif
+
+// CHECK: __native_client__defined
+#ifdef __native_client__
+void __native_client__defined() {}
+#endif
+
+// CHECK: __x86_64__defined
+#ifdef __x86_64__
+void __x86_64__defined() {}
+#endif
+
+// CHECK: unixdefined
+#ifdef unix
+void unixdefined() {}
+#endif
+
+// CHECK: __ELF__defined
+#ifdef __ELF__
+void __ELF__defined() {}
+#endif
+
+// CHECK: _GNU_SOURCEdefined
+#ifdef _GNU_SOURCE
+void _GNU_SOURCEdefined() {}
+#endif
+
+// THREADS: _REENTRANTdefined
+// CHECK: _REENTRANTundefined
+#ifdef _REENTRANT
+void _REENTRANTdefined() {}
+#else
+void _REENTRANTundefined() {}
+#endif