Improve MS compatibility for Clang/C2

This forces the MS Compatibility flag which enables Windows headers to work

CMake is now able to generate a full CMake Clang project.

Crashes are occuring in Clang though, should help a lot though to make progress.

Author: khouzam

Source/cmGlobalGenerator.cxx

@@ -441,7 +441,11 @@ cmGlobalGenerator::EnableLanguage(std::vector<std::string>const& languages,
 
 #ifdef KWSYS_WINDOWS_DEPRECATED_GetVersionEx
 # pragma warning (push)
-# pragma warning (disable:4996)
+# if defined(__clang__)
+#  pragma clang diagnostic ignored "-Wdeprecated-declarations"
+# else // MSVC
+#  pragma warning (disable:4996)
+# endif
 #endif
     GetVersionExW((OSVERSIONINFOW*)&osviex);
 #ifdef KWSYS_WINDOWS_DEPRECATED_GetVersionEx

Source/cmVisualStudio10TargetGenerator.cxx

@@ -1950,6 +1950,10 @@ bool cmVisualStudio10TargetGenerator::ComputeClOptions(
     {
     clOptions.AddFlag("CompileAs", "CompileAsCpp");
     }
+  if(IsClang())
+    {
+    clOptions.AddFlag("MSCompatibility", "true");
+    }
   this->LocalGenerator->AddCompileOptions(flags, this->Target,
                                           linkLanguage, configName.c_str());
 

Source/kwsys/ProcessWin32.c

@@ -365,7 +365,9 @@ kwsysProcess* kwsysProcess_New(void)
 # pragma warning (push)
 # ifdef __INTEL_COMPILER
 #  pragma warning (disable:1478)
-# else
+# elif defined(__clang__)
+#  pragma clang diagnostic ignored "-Wdeprecated-declarations"
+# else // MSVC
 #  pragma warning (disable:4996)
 # endif
 #endif
@@ -2897,8 +2899,8 @@ static int kwsysProcessesAdd(HANDLE hProcess, DWORD dwProcessid,
     newSize = kwsysProcesses.Size? kwsysProcesses.Size*2 : 4;
 
     /* Try allocating the new block of memory.  */
-    if(newArray = (kwsysProcessInstance*)malloc(
-       newSize*sizeof(kwsysProcessInstance)))
+    if((newArray = (kwsysProcessInstance*)malloc(
+       newSize*sizeof(kwsysProcessInstance))))
       {
       /* Copy the old process handles to the new memory.  */
       if(kwsysProcesses.Count > 0)

Source/kwsys/SystemInformation.cxx

@@ -201,13 +201,13 @@ typedef struct rlimit ResourceLimitType;
 # endif
 #endif
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1300) && !defined(_WIN64)
+#if defined(_MSC_VER) && (_MSC_VER >= 1300) && !defined(_WIN64) && !defined(__clang__)
 #define USE_ASM_INSTRUCTIONS 1
 #else
 #define USE_ASM_INSTRUCTIONS 0
 #endif
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1400)
+#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__clang__)
 #include <intrin.h>
 #define USE_CPUID_INTRINSICS 1
 #else
@@ -5171,7 +5171,9 @@ bool SystemInformationImplementation::QueryOSInformation()
 # pragma warning (push)
 # ifdef __INTEL_COMPILER
 #  pragma warning (disable:1478)
-# else
+# elif defined(__clang__)
+#  pragma clang diagnostic ignored "-Wdeprecated-declarations"
+# else // MSVC
 #  pragma warning (disable:4996)
 # endif
 #endif

Source/kwsys/SystemTools.cxx

@@ -4894,7 +4894,9 @@ std::string SystemTools::GetOperatingSystemNameAndVersion()
 # pragma warning (push)
 # ifdef __INTEL_COMPILER
 #  pragma warning (disable:1478)
-# else
+# elif defined(__clang__)
+#  pragma clang diagnostic ignored "-Wdeprecated-declarations"
+# else // MSVC
 #  pragma warning (disable:4996)
 # endif
 #endif