Remove (untested) code for unsupported compilers.

src/base/platform/platform-win32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Platform-specific code for Win32.
 
 // Secure API functions are not available using MinGW with msvcrt.dll
 // on Windows XP. Make sure MINGW_HAS_SECURE_API is not defined to
 // disable definition of secure API functions in standard headers that
 // would conflict with our own implementation.
 #ifdef __MINGW32__
 #include <_mingw.h>
 #ifdef MINGW_HAS_SECURE_API
 #undef MINGW_HAS_SECURE_API
 #endif  // MINGW_HAS_SECURE_API
 #endif  // __MINGW32__
 
-#ifdef _MSC_VER
 #include <limits>
-#endif
 
 #include "src/base/win32-headers.h"
 
 #include "src/base/bits.h"
 #include "src/base/lazy-instance.h"
 #include "src/base/macros.h"
 #include "src/base/platform/platform.h"
 #include "src/base/platform/time.h"
 #include "src/base/utils/random-number-generator.h"
 
-#ifdef _MSC_VER
-
-// Case-insensitive bounded string comparisons. Use stricmp() on Win32. Usually
-// defined in strings.h.
-int strncasecmp(const char* s1, const char* s2, int n) {
-  return _strnicmp(s1, s2, n);
-}
-
-#endif  // _MSC_VER
-
 
 // Extra functions for MinGW. Most of these are the _s functions which are in
 // the Microsoft Visual Studio C++ CRT.
 #ifdef __MINGW32__
 
 
 #ifndef __MINGW64_VERSION_MAJOR
 
 #define _TRUNCATE 0
 #define STRUNCATE 80
@@ skipping 774 matching lines @@
 void OS::Abort() {
   if (g_hard_abort) {
     V8_IMMEDIATE_CRASH();
   }
   // Make the MSVCRT do a silent abort.
   raise(SIGABRT);
 }
 
 
 void OS::DebugBreak() {
-#ifdef _MSC_VER
+#if V8_CC_MSVC
   // To avoid Visual Studio runtime support the following code can be used
   // instead
   // __asm { int 3 }
   __debugbreak();
 #else
   ::DebugBreak();
 #endif
 }
 
 
@@ skipping 322 matching lines @@
 std::vector<OS::SharedLibraryAddress> OS::GetSharedLibraryAddresses() {
   return std::vector<OS::SharedLibraryAddress>();
 }
 
 
 void OS::SignalCodeMovingGC() { }
 #endif  // __MINGW32__
 
 
 double OS::nan_value() {
-#ifdef _MSC_VER
   return std::numeric_limits<double>::quiet_NaN();
-#else  // _MSC_VER
-  return NAN;
-#endif  // _MSC_VER
 }
 
 
 int OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   return 16;  // Windows 64-bit ABI requires the stack to be 16-byte aligned.
 #elif defined(__MINGW32__)
   // With gcc 4.4 the tree vectorization optimizer can generate code
   // that requires 16 byte alignment such as movdqa on x86.
   return 16;
@@ skipping 204 matching lines @@
   DCHECK(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::base