A64: Synchronize with r16489.

include/v8config.h

Index: include/v8config.h
diff --git a/include/v8config.h b/include/v8config.h
index e72560f5ae2040ad4127ee9580b0bdbf96576198..0993a9f3e4fd9b7e13e8ca8eda8f83bb987a5bcd 100644
--- a/include/v8config.h
+++ b/include/v8config.h
@@ -28,6 +28,52 @@
 #ifndef V8CONFIG_H_
 #define V8CONFIG_H_
 
+// Platform headers for feature detection below.
+#if defined(__ANDROID__)
+# include <sys/cdefs.h>
+#elif defined(__APPLE__)
+# include <TargetConditionals.h>
+#elif defined(__linux__)
+# include <features.h>
+#endif
+
+
+// This macro allows to test for the version of the GNU C library (or
+// a compatible C library that masquerades as glibc). It evaluates to
+// 0 if libc is not GNU libc or compatible.
+// Use like:
+//  #if V8_GLIBC_PREREQ(2, 3)
+//   ...
+//  #endif
+#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
+# define V8_GLIBC_PREREQ(major, minor)                                    \
+    ((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor)))
+#else
+# define V8_GLIBC_PREREQ(major, minor) 0
+#endif
+
+
+// This macro allows to test for the version of the GNU C++ compiler.
+// Note that this also applies to compilers that masquerade as GCC,
+// for example clang and the Intel C++ compiler for Linux.
+// Use like:
+//  #if V8_GNUC_PREREQ(4, 3, 1)
+//   ...
+//  #endif
+#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
+# define V8_GNUC_PREREQ(major, minor, patchlevel)                         \
+    ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >=   \
+     ((major) * 10000 + (minor) * 100 + (patchlevel)))
+#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define V8_GNUC_PREREQ(major, minor, patchlevel)       \
+    ((__GNUC__ * 10000 + __GNUC_MINOR__) >=             \
+     ((major) * 10000 + (minor) * 100 + (patchlevel)))
+#else
+# define V8_GNUC_PREREQ(major, minor, patchlevel) 0
+#endif
+
+
+
 // -----------------------------------------------------------------------------
 // Operating system detection
 //
@@ -87,12 +133,40 @@
 
 
 // -----------------------------------------------------------------------------
+// C library detection
+//
+//  V8_LIBC_BIONIC  - Bionic libc
+//  V8_LIBC_BSD     - BSD libc derivate
+//  V8_LIBC_GLIBC   - GNU C library
+//  V8_LIBC_UCLIBC  - uClibc
+//
+// Note that testing for libc must be done using #if not #ifdef. For example,
+// to test for the GNU C library, use:
+//  #if V8_LIBC_GLIBC
+//   ...
+//  #endif
+
+#if defined(__BIONIC__)
+# define V8_LIBC_BIONIC 1
+# define V8_LIBC_BSD 1
+#elif defined(__UCLIBC__)
+# define V8_LIBC_UCLIBC 1
+#elif defined(__GLIBC__) || defined(__GNU_LIBRARY__)
+# define V8_LIBC_GLIBC 1
+#else
+# define V8_LIBC_BSD V8_OS_BSD
+#endif
+
+
+// -----------------------------------------------------------------------------
 // Compiler detection
 //
 //  V8_CC_CLANG   - Clang
 //  V8_CC_GNU     - GNU C++
 //  V8_CC_INTEL   - Intel C++
 //  V8_CC_MINGW   - Minimalist GNU for Windows
+//  V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32)
+//  V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64)
 //  V8_CC_MSVC    - Microsoft Visual C/C++
 //
 // C++11 feature detection
@@ -132,9 +206,6 @@
 
 #if defined(__clang__)
 
-// Don't treat clang as GCC.
-# define V8_GNUC_PREREQ(major, minor, patchlevel) 0
-
 # define V8_CC_CLANG 1
 
 // Clang defines __alignof__ as alias for __alignof
@@ -159,14 +230,12 @@
 
 #elif defined(__GNUC__)
 
-# define V8_GNUC_PREREQ(major, minor, patchlevel)                         \
-    ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >=   \
-     ((major) * 10000 + (minor) * 100 + (patchlevel)))
-
 # define V8_CC_GNU 1
 // Intel C++ also masquerades as GCC 3.2.0
 # define V8_CC_INTEL (defined(__INTEL_COMPILER))
-# define V8_CC_MINGW (defined(__MINGW32__))
+# define V8_CC_MINGW32 (defined(__MINGW32__))
+# define V8_CC_MINGW64 (defined(__MINGW64__))
+# define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64)
 
 # define V8_HAS___ALIGNOF__ (V8_GNUC_PREREQ(4, 3, 0))
 
@@ -203,8 +272,6 @@
 
 #elif defined(_MSC_VER)
 
-# define V8_GNUC_PREREQ(major, minor, patchlevel) 0
-
 # define V8_CC_MSVC 1
 
 # define V8_HAS___ALIGNOF 1