Implement correct OS and CC detection.

src/platform-posix.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_PLATFORM_POSIX_H_
 #define V8_PLATFORM_POSIX_H_
 
-#if !defined(ANDROID)
+#include "platform.h"
+
+#if !V8_OS_ANDROID
 #include <cxxabi.h>
 #endif
 #include <stdio.h>
 
-#include "platform.h"
-
 namespace v8 {
 namespace internal {
 
 // Used by platform implementation files during OS::DumpBacktrace()
 // and OS::StackWalk().
 template<int (*backtrace)(void**, int),
          char** (*backtrace_symbols)(void* const*, int)>
 struct POSIXBacktraceHelper {
   static void DumpBacktrace() {
     void* trace[100];
     int size = backtrace(trace, ARRAY_SIZE(trace));
     char** symbols = backtrace_symbols(trace, size);
     fprintf(stderr, "\n==== C stack trace ===============================\n\n");
     if (size == 0) {
       fprintf(stderr, "(empty)\n");
     } else if (symbols == NULL) {
       fprintf(stderr, "(no symbols)\n");
     } else {
       for (int i = 1; i < size; ++i) {
         fprintf(stderr, "%2d: ", i);
         char mangled[201];
         if (sscanf(symbols[i], "%*[^(]%*[(]%200[^)+]", mangled) == 1) {// NOLINT
           char* demangled = NULL;
-#if !defined(ANDROID)
+#if !V8_OS_ANDROID
           int status;
           size_t length;
           demangled = abi::__cxa_demangle(mangled, NULL, &length, &status);
 #endif
           fprintf(stderr, "%s\n", demangled != NULL ? demangled : mangled);
           free(demangled);
         } else {
           fprintf(stderr, "??\n");
         }
       }
@@ skipping 25 matching lines @@
 
     free(symbols);
 
     return frames_count;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_POSIX_H_