Revert the latest set of platform changes.

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // 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
@@ 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 V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
-// ----------------------------------------------------------------------------
-// Operating system detection (V8_OS_x)
-//
-//  ANDROID - Android
-//  BSD4    - Any BSD 4.4 system
-//  CYGWIN  - Cygwin
-//  DARWIN  - Darwin / Mac OS X
-//  FREEBSD - FreeBSD
-//  LINUX   - Linux
-//  NACL    - Native Client
-//  NETBSD  - NetBSD
-//  OPENBSD - OpenBSD
-//  SOLARIS - Solaris
-//  UNIX    - Any UNIX BSD/SYSV system
-//  WIN32   - Win32 (Windows 2000/XP/Vista/7 and Windows Server 2003/2008)
+// Define V8_INFINITY
+#define V8_INFINITY INFINITY
 
-#if defined(ANDROID) || defined(__ANDROID__)
-# define V8_OS_ANDROID 1
-# define V8_OS_LINUX 1
-# define V8_OS_UNIX 1
-#elif defined(__APPLE__) && defined(__MACH__)
-# define V8_OS_DARWIN 1
-# define V8_OS_BSD4 1
-# define V8_OS_UNIX 1
-#elif defined(__CYGWIN__)
-# define V8_OS_CYGWIN 1
-# define V8_OS_UNIX 1
-#elif defined(WIN64) || defined(_WIN64) || defined(__WIN64__)
-# define V8_OS_WIN32 1
-# define V8_OS_WIN64 1
-#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || \
-    (defined(__MWERKS__) && defined(__INTEL__))
-# define V8_OS_WIN32 1
-#elif defined(__sun) || defined(sun)
-# define V8_OS_SOLARIS 1
-# define V8_OS_UNIX 1
-#elif defined(__native_client__)
-# define V8_OS_NACL 1
-# define V8_OS_UNIX 1
-#elif defined(__linux__) || defined(__linux)
-# define V8_OS_LINUX 1
-# define V8_OS_UNIX 1
-#elif defined(__FreeBSD__) || defined(__DragonFly__)
-# define V8_OS_FREEBSD 1
-# define V8_OS_BSD4 1
-# define V8_OS_UNIX 1
-#elif defined(__NetBSD__)
-# define V8_OS_NETBSD 1
-# define V8_OS_BSD4 1
-# define V8_OS_UNIX 1
-#elif defined(__OpenBSD__)
-# define V8_OS_OPENBSD 1
-# define V8_OS_BSD4 1
-# define V8_OS_UNIX 1
-#else
-# error Operating system was not detected as supported by v8
+// GCC specific stuff
+#ifdef __GNUC__
+
+#define __GNUC_VERSION_FOR_INFTY__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
+
+// Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
+// warning flag and certain versions of GCC due to a bug:
+// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
+// For now, we use the more involved template-based version from <limits>, but
+// only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
+// __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro
+#if __GNUC_VERSION_FOR_INFTY__ >= 29600 && __GNUC_VERSION_FOR_INFTY__ < 40100
+#include <limits>
+#undef V8_INFINITY
+#define V8_INFINITY std::numeric_limits<double>::infinity()
+#endif
+#undef __GNUC_VERSION_FOR_INFTY__
+
+#endif  // __GNUC__
+
+#ifdef _MSC_VER
+#undef V8_INFINITY
+#define V8_INFINITY HUGE_VAL
 #endif
 
 
-// ----------------------------------------------------------------------------
-// Compiler detection (V8_CC_x)
-//
-//  CLANG - C++ front-end for the LLVM compiler
-//  GNU   - GNU C++ or compatible
-//  INTEL - Intel C++ for Linux or Windows
-//  MINGW - Minimalistic GNU for Windows Compiler
-//  MIPS  - MIPSpro C++
-//  MSVC  - Microsoft Visual C/C++ or compatible
-//  RVCT  - ARM Realview Compiler Suite
+#include "../include/v8stdint.h"
 
-#if defined(_MSC_VER)
-# define V8_CC_MSVC 1
-# if defined(__INTEL_COMPILER)
-#  define V8_CC_INTEL 1
-# endif
-#elif defined(__GNUC__)
-# define V8_CC_GNU 1
-# if defined(__MINGW64__)
-#  define V8_CC_MINGW 1
-#  define V8_CC_MINGW64 1
-# elif defined(__MINGW32__)
-#  define V8_CC_MINGW 1
-#  define V8_CC_MINGW32 1
-# elif defined(__ARMCC__) || defined(__CC_ARM)
-#  define V8_CC_RVCT 1  // ARM Realview Compiler Suite also masquerades as GCC
-# elif defined(__INTEL_COMPILER)
-#  define V8_CC_INTEL 1  // Intel C++ also masquerades as GCC 3.2.0
-# elif defined(__clang__)
-#  define V8_CC_CLANG 1  // Clang also masquerades as GCC 4.2.1
-#  ifndef __has_extension
-#   define __has_extension __has_feature  // Compatibility with older releases
-#  endif
-# endif
-#elif defined(__ARMCC__) || defined(__CC_ARM)
-# define V8_CC_RVCT 1
-#elif defined(__INTEL_COMPILER)
-# define V8_CC_INTEL 1
-#elif defined(__SUNPRO_CC) || defined(__SUNPRO_C)
-# define V8_CC_SUN 1
-#else
-# error Compiler was not detected as supported by v8
-#endif
+namespace v8 {
+namespace internal {
 
-#if V8_CC_GNU
-# define V8_GNUC_PREREQ(major, minor) \
-    (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
-#else
-# define V8_GNUC_PREREQ(major, minor) 0
-#endif  // V8_CC_GNU
-
-
-// ----------------------------------------------------------------------------
-// Compiler features
-
-// C++11 deleted functions
-#if __cplusplus >= 201103L
-# define V8_CXX_DELETED_FUNCTIONS 1
-#elif V8_CC_CLANG
-# define V8_CXX_DELETED_FUNCTIONS __has_feature(cxx_deleted_functions)
-#else
-# define V8_CXX_DELETED_FUNCTIONS (defined(__GXX_EXPERIMENTAL_CXX0X__) && \
-                                   V8_GNUC_PREREQ(4, 4))
-#endif
-
-// C++11 static_assert()
-#if __cplusplus >= 201103L
-# define V8_CXX_STATIC_ASSERT 1
-#elif V8_CC_CLANG
-# define V8_CXX_STATIC_ASSERT (__has_extension(cxx_static_assert) || \
-                               __has_feature(cxx_static_assert))
-#else
-# define V8_CXX_STATIC_ASSERT (defined(__GXX_EXPERIMENTAL_CXX0X__) && \
-                               V8_GNUC_PREREQ(4, 3))
-#endif
-
-
-// ----------------------------------------------------------------------------
-// Host architecture detection.  For more info on what's defined, see:
+// 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__)
-# if V8_OS_NACL
+#if defined(__native_client__)
 // For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8
 // generates ARM machine code, together with a portable ARM simulator
 // compiled for the host architecture in question.
 //
 // Since Native Client is ILP-32 on all architectures we use
 // V8_HOST_ARCH_IA32 on both 32- and 64-bit x86.
-#  define V8_HOST_ARCH_IA32 1
-#  define V8_HOST_ARCH_32_BIT 1
-#  define V8_HOST_CAN_READ_UNALIGNED 1
-# else
-#  define V8_HOST_ARCH_X64 1
-#  define V8_HOST_ARCH_64_BIT 1
-#  define V8_HOST_CAN_READ_UNALIGNED 1
-# endif  // V8_OS_NACL
+#define V8_HOST_ARCH_IA32 1
+#define V8_HOST_ARCH_32_BIT 1
+#define V8_HOST_CAN_READ_UNALIGNED 1
+#else
+#define V8_HOST_ARCH_X64 1
+#define V8_HOST_ARCH_64_BIT 1
+#define V8_HOST_CAN_READ_UNALIGNED 1
+#endif  // __native_client__
 #elif defined(_M_IX86) || defined(__i386__)
-# define V8_HOST_ARCH_IA32 1
-# define V8_HOST_ARCH_32_BIT 1
-# define V8_HOST_CAN_READ_UNALIGNED 1
+#define V8_HOST_ARCH_IA32 1
+#define V8_HOST_ARCH_32_BIT 1
+#define V8_HOST_CAN_READ_UNALIGNED 1
 #elif defined(__ARMEL__)
-# define V8_HOST_ARCH_ARM 1
-# define V8_HOST_ARCH_32_BIT 1
+#define V8_HOST_ARCH_ARM 1
+#define V8_HOST_ARCH_32_BIT 1
 #elif defined(__MIPSEL__)
-# define V8_HOST_ARCH_MIPS 1
-# define V8_HOST_ARCH_32_BIT 1
+#define V8_HOST_ARCH_MIPS 1
+#define V8_HOST_ARCH_32_BIT 1
 #else
-# error Host architecture was not detected as supported by v8
+#error Host architecture was not detected as supported by v8
 #endif
 
 #if defined(__ARM_ARCH_7A__) || \
     defined(__ARM_ARCH_7R__) || \
     defined(__ARM_ARCH_7__)
 # define CAN_USE_ARMV7_INSTRUCTIONS 1
 # ifndef CAN_USE_VFP3_INSTRUCTIONS
-#  define CAN_USE_VFP3_INSTRUCTIONS 1
+#  define CAN_USE_VFP3_INSTRUCTIONS
 # endif
 #endif
 
 
-// ----------------------------------------------------------------------------
 // Target architecture detection. This may be set externally. If not, detect
 // in the same way as the host architecture, that is, target the native
 // environment as presented by the compiler.
-
 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && \
     !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_MIPS
-# if defined(_M_X64) || defined(__x86_64__)
-#  define V8_TARGET_ARCH_X64 1
-# elif defined(_M_IX86) || defined(__i386__)
-#  define V8_TARGET_ARCH_IA32 1
-# elif defined(__ARMEL__)
-#  define V8_TARGET_ARCH_ARM 1
-# elif defined(__MIPSEL__)
-#  define V8_TARGET_ARCH_MIPS 1
-# else
-#  error Target architecture was not detected as supported by v8
-# endif
+#if defined(_M_X64) || defined(__x86_64__)
+#define V8_TARGET_ARCH_X64 1
+#elif defined(_M_IX86) || defined(__i386__)
+#define V8_TARGET_ARCH_IA32 1
+#elif defined(__ARMEL__)
+#define V8_TARGET_ARCH_ARM 1
+#elif defined(__MIPSEL__)
+#define V8_TARGET_ARCH_MIPS 1
+#else
+#error Target architecture was not detected as supported by v8
+#endif
 #endif
 
 // Check for supported combinations of host and target architectures.
 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
-# error Target architecture ia32 is only supported on ia32 host
-#elif V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64
-# error Target architecture x64 is only supported on x64 host
-#elif V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM)
-# error Target architecture arm is only supported on arm and ia32 host
-#elif V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS)
-# error Target architecture mips is only supported on mips and ia32 host
+#error Target architecture ia32 is only supported on ia32 host
+#endif
+#if V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64
+#error Target architecture x64 is only supported on x64 host
+#endif
+#if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
+#error Target architecture arm is only supported on arm and ia32 host
+#endif
+#if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS))
+#error Target architecture mips is only supported on mips and ia32 host
 #endif
 
 // Determine whether we are running in a simulated environment.
 // Setting USE_SIMULATOR explicitly from the build script will force
 // the use of a simulated environment.
 #if !defined(USE_SIMULATOR)
-# if V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM
-#  define USE_SIMULATOR 1
-# elif V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS
-#  define USE_SIMULATOR 1
-# endif
+#if (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM)
+#define USE_SIMULATOR 1
+#endif
+#if (V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS)
+#define USE_SIMULATOR 1
+#endif
 #endif
 
 // Determine architecture endiannes (we only support little-endian).
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64 || \
-    V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
-# define V8_TARGET_LITTLE_ENDIAN 1
+#if V8_TARGET_ARCH_IA32
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif V8_TARGET_ARCH_X64
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif V8_TARGET_ARCH_ARM
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif V8_TARGET_ARCH_MIPS
+#define V8_TARGET_LITTLE_ENDIAN 1
 #else
-# error Unknown target architecture endiannes
+#error Unknown target architecture endiannes
 #endif
 
-
-// ----------------------------------------------------------------------------
-// Define our own macros for writing 64-bit constants.  This is less fragile
-// than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it
-// works on compilers that don't have it (like MSVC).
-#if V8_HOST_ARCH_64_BIT
-# if V8_CC_MSVC
-#  define V8_UINT64_C(x)  (x ## UI64)
-#  define V8_INT64_C(x)   (x ## I64)
-#  define V8_INTPTR_C(x)  (x ## I64)
-#  define V8_PTR_PREFIX "ll"
-# elif V8_CC_MINGW
-#  define V8_UINT64_C(x)  (x ## ULL)
-#  define V8_INT64_C(x)   (x ## LL)
-#  define V8_INTPTR_C(x)  (x ## LL)
-#  define V8_PTR_PREFIX "I64"
-# else
-#  define V8_UINT64_C(x)  (x ## UL)
-#  define V8_INT64_C(x)   (x ## L)
-#  define V8_INTPTR_C(x)  (x ## L)
-#  define V8_PTR_PREFIX "l"
-# endif
-#else  // V8_HOST_ARCH_64_BIT
-# define V8_INTPTR_C(x)  (x)
-# define V8_PTR_PREFIX ""
-#endif  // V8_HOST_ARCH_64_BIT
-
-// The following macro works on both 32 and 64-bit platforms.
-// Usage: instead of writing 0x1234567890123456
-//      write V8_2PART_UINT64_C(0x12345678,90123456);
-#define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u))
-
-#if V8_OS_DARWIN
-// Fix for Mac OS X defining uintptr_t as "unsigned long":
-# define V8PRIxPTR "lx"
-#else
-# define V8PRIxPTR V8_PTR_PREFIX "x"
-#endif  // V8_OS_DARWIN
-#define V8PRIdPTR V8_PTR_PREFIX "d"
-#define V8PRIuPTR V8_PTR_PREFIX "u"
-
-
-// ----------------------------------------------------------------------------
-// Define V8_INFINITY
-#if V8_GNUC_PREREQ(2, 96) && !V8_GNUC_PREREQ(4, 1)
-// Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
-// warning flag and certain versions of GCC due to a bug:
-// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
-// For now, we use the more involved template-based version from <limits>, but
-// only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
-# include <limits>
-# define V8_INFINITY std::numeric_limits<double>::infinity()
-#elif V8_CC_MSVC
-# define V8_INFINITY HUGE_VAL
-#else
-# define V8_INFINITY INFINITY
-#endif
-
-
-#include "../include/v8stdint.h"
-
-namespace v8 {
-namespace internal {
-
 // Support for alternative bool type. This is only enabled if the code is
 // compiled with USE_MYBOOL defined. This catches some nasty type bugs.
 // For instance, 'bool b = "false";' results in b == true! This is a hidden
 // source of bugs.
 // However, redefining the bool type does have some negative impact on some
 // platforms. It gives rise to compiler warnings (i.e. with
 // MSVC) in the API header files when mixing code that uses the standard
 // bool with code that uses the redefined version.
 // This does not actually belong in the platform code, but needs to be
 // defined here because the platform code uses bool, and platform.h is
 // include very early in the main include file.
 
 #ifdef USE_MYBOOL
 typedef unsigned int __my_bool__;
 #define bool __my_bool__  // use 'indirection' to avoid name clashes
 #endif
 
 typedef uint8_t byte;
 typedef byte* Address;
 
+// Define our own macros for writing 64-bit constants.  This is less fragile
+// than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it
+// works on compilers that don't have it (like MSVC).
+#if V8_HOST_ARCH_64_BIT
+#if defined(_MSC_VER)
+#define V8_UINT64_C(x)  (x ## UI64)
+#define V8_INT64_C(x)   (x ## I64)
+#define V8_INTPTR_C(x)  (x ## I64)
+#define V8_PTR_PREFIX "ll"
+#elif defined(__MINGW64__)
+#define V8_UINT64_C(x)  (x ## ULL)
+#define V8_INT64_C(x)   (x ## LL)
+#define V8_INTPTR_C(x)  (x ## LL)
+#define V8_PTR_PREFIX "I64"
+#else
+#define V8_UINT64_C(x)  (x ## UL)
+#define V8_INT64_C(x)   (x ## L)
+#define V8_INTPTR_C(x)  (x ## L)
+#define V8_PTR_PREFIX "l"
+#endif
+#else  // V8_HOST_ARCH_64_BIT
+#define V8_INTPTR_C(x)  (x)
+#define V8_PTR_PREFIX ""
+#endif  // V8_HOST_ARCH_64_BIT
+
+// The following macro works on both 32 and 64-bit platforms.
+// Usage: instead of writing 0x1234567890123456
+//      write V8_2PART_UINT64_C(0x12345678,90123456);
+#define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u))
+
+#define V8PRIxPTR V8_PTR_PREFIX "x"
+#define V8PRIdPTR V8_PTR_PREFIX "d"
+#define V8PRIuPTR V8_PTR_PREFIX "u"
+
+// Fix for Mac OS X defining uintptr_t as "unsigned long":
+#if defined(__APPLE__) && defined(__MACH__)
+#undef V8PRIxPTR
+#define V8PRIxPTR "lx"
+#endif
+
+#if (defined(__APPLE__) && defined(__MACH__)) || \
+    defined(__FreeBSD__) || defined(__OpenBSD__)
+#define USING_BSD_ABI
+#endif
+
 // -----------------------------------------------------------------------------
 // Constants
 
 const int KB = 1024;
 const int MB = KB * KB;
 const int GB = KB * KB * KB;
 const int kMaxInt = 0x7FFFFFFF;
 const int kMinInt = -kMaxInt - 1;
 
 const uint32_t kMaxUInt32 = 0xFFFFFFFFu;
@@ skipping 82 matching lines @@
 
 
 // FUNCTION_CAST<F>(addr) casts an address into a function
 // of type F. Used to invoke generated code from within C.
 template <typename F>
 F FUNCTION_CAST(Address addr) {
   return reinterpret_cast<F>(reinterpret_cast<intptr_t>(addr));
 }
 
 
-#if V8_CXX_DELETED_FUNCTIONS
-# define DISALLOW_BY_DELETE = delete
+#if __cplusplus >= 201103L
+#define DISALLOW_BY_DELETE = delete
 #else
-# define DISALLOW_BY_DELETE
+#define DISALLOW_BY_DELETE
 #endif
 
 
 // A macro to disallow the evil copy constructor and operator= functions
 // This should be used in the private: declarations for a class
 #define DISALLOW_COPY_AND_ASSIGN(TypeName)           \
   TypeName(const TypeName&) DISALLOW_BY_DELETE;      \
   void operator=(const TypeName&) DISALLOW_BY_DELETE
 
 
 // A macro to disallow all the implicit constructors, namely the
 // default constructor, copy constructor and operator= functions.
 //
 // This should be used in the private: declarations for a class
 // that wants to prevent anyone from instantiating it. This is
 // especially useful for classes containing only static methods.
 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
   TypeName() DISALLOW_BY_DELETE;                 \
   DISALLOW_COPY_AND_ASSIGN(TypeName)
 
 
 // Define used for helping GCC to make better inlining. Don't bother for debug
 // builds. On GCC 3.4.5 using __attribute__((always_inline)) causes compilation
 // errors in debug build.
-#if V8_GNUC_PREREQ(4, 0) && !defined(DEBUG)
-# define INLINE(header) inline header  __attribute__((always_inline))
-# define NO_INLINE(header) header __attribute__((noinline))
-#elif V8_CC_GNU && !defined(DEBUG)
-# define INLINE(header) inline __attribute__((always_inline)) header
-# define NO_INLINE(header) __attribute__((noinline)) header
-#elif V8_CC_MSVC && !defined(DEBUG)
-# define INLINE(header) __forceinline header
-# define NO_INLINE(header) header
+#if defined(__GNUC__) && !defined(DEBUG)
+#if (__GNUC__ >= 4)
+#define INLINE(header) inline header  __attribute__((always_inline))
+#define NO_INLINE(header) header __attribute__((noinline))
 #else
-# define INLINE(header) inline header
-# define NO_INLINE(header) header
+#define INLINE(header) inline __attribute__((always_inline)) header
+#define NO_INLINE(header) __attribute__((noinline)) header
+#endif
+#elif defined(_MSC_VER) && !defined(DEBUG)
+#define INLINE(header) __forceinline header
+#define NO_INLINE(header) header
+#else
+#define INLINE(header) inline header
+#define NO_INLINE(header) header
 #endif
 
 
-#if V8_GNUC_PREREQ(4, 0)
+#if defined(__GNUC__) && __GNUC__ >= 4
 #define MUST_USE_RESULT __attribute__ ((warn_unused_result))
 #else
 #define MUST_USE_RESULT
 #endif
 
 
 // Define DISABLE_ASAN macros.
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
 #define DISABLE_ASAN __attribute__((no_address_safety_analysis))
@@ skipping 54 matching lines @@
 // the backend, so both modes are represented by the kStrictMode value.
 enum StrictModeFlag {
   kNonStrictMode,
   kStrictMode
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_