Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/stubs/platform_macros.h

 // Protocol Buffers - Google's data interchange format
 // Copyright 2012 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+// http://code.google.com/p/protobuf/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
@@ skipping 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef GOOGLE_PROTOBUF_PLATFORM_MACROS_H_
 #define GOOGLE_PROTOBUF_PLATFORM_MACROS_H_
 
-#define GOOGLE_PROTOBUF_PLATFORM_ERROR \
-#error "Host platform was not detected as supported by protobuf"
+#include <google/protobuf/stubs/common.h>
 
 // Processor architecture detection.  For more info on what's defined, see:
 //   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
 //   http://www.agner.org/optimize/calling_conventions.pdf
 //   or with gcc, run: "echo | gcc -E -dM -"
 #if defined(_M_X64) || defined(__x86_64__)
 #define GOOGLE_PROTOBUF_ARCH_X64 1
 #define GOOGLE_PROTOBUF_ARCH_64_BIT 1
 #elif defined(_M_IX86) || defined(__i386__)
 #define GOOGLE_PROTOBUF_ARCH_IA32 1
@@ skipping 10 matching lines @@
 #elif defined(__MIPSEL__)
 #if defined(__LP64__)
 #define GOOGLE_PROTOBUF_ARCH_MIPS64 1
 #define GOOGLE_PROTOBUF_ARCH_64_BIT 1
 #else
 #define GOOGLE_PROTOBUF_ARCH_MIPS 1
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
 #endif
 #elif defined(__pnacl__)
 #define GOOGLE_PROTOBUF_ARCH_32_BIT 1
-#elif defined(sparc)
-#define GOOGLE_PROTOBUF_ARCH_SPARC 1
-#ifdef SOLARIS_64BIT_ENABLED
-#define GOOGLE_PROTOBUF_ARCH_64_BIT 1
+#elif defined(__ppc__)
+#define GOOGLE_PROTOBUF_ARCH_PPC 1
+#define GOOGLE_PROTOBUF_ARCH_32_BIT 1
 #else
-#define GOOGLE_PROTOBUF_ARCH_32_BIT 1
-#endif
-#elif defined(_POWER)
-#define GOOGLE_PROTOBUF_ARCH_POWER 1
-#define GOOGLE_PROTOBUF_ARCH_64_BIT 1
-#elif defined(__GNUC__)
-# if (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4))
-// We fallback to the generic Clang/GCC >= 4.7 implementation in atomicops.h
-# elif defined(__clang__)
-#  if !__has_extension(c_atomic)
-GOOGLE_PROTOBUF_PLATFORM_ERROR
-#  endif
-// We fallback to the generic Clang/GCC >= 4.7 implementation in atomicops.h
-# endif
-# if __LP64__
-#  define GOOGLE_PROTOBUF_ARCH_64_BIT 1
-# else
-#  define GOOGLE_PROTOBUF_ARCH_32_BIT 1
-# endif
-#else
-GOOGLE_PROTOBUF_PLATFORM_ERROR
+#error Host architecture was not detected as supported by protobuf
 #endif
 
 #if defined(__APPLE__)
 #define GOOGLE_PROTOBUF_OS_APPLE
-#include <TargetConditionals.h>
-#if TARGET_OS_IPHONE
-#define GOOGLE_PROTOBUF_OS_IPHONE
-#endif
 #elif defined(__native_client__)
 #define GOOGLE_PROTOBUF_OS_NACL
-#elif defined(sun)
-#define GOOGLE_PROTOBUF_OS_SOLARIS
-#elif defined(_AIX)
-#define GOOGLE_PROTOBUF_OS_AIX
-#elif defined(__ANDROID__)
-#define GOOGLE_PROTOBUF_OS_ANDROID
-#endif
-
-#undef GOOGLE_PROTOBUF_PLATFORM_ERROR
-
-#if defined(GOOGLE_PROTOBUF_OS_ANDROID) || defined(GOOGLE_PROTOBUF_OS_IPHONE)
-// Android ndk does not support the __thread keyword very well yet. Here
-// we use pthread_key_create()/pthread_getspecific()/... methods for
-// TLS support on android.
-// iOS also does not support the __thread keyword.
-#define GOOGLE_PROTOBUF_NO_THREADLOCAL
 #endif
 
 #endif  // GOOGLE_PROTOBUF_PLATFORM_MACROS_H_