VS: in Clang/C2 toolset, setup correct compiler settings

Modules/Platform/Windows-MSVC.cmake

@@ -194,8 +194,14 @@ else()
   if(_MSVC_C_ARCHITECTURE_FAMILY STREQUAL "ARM" OR _MSVC_CXX_ARCHITECTURE_FAMILY STREQUAL "ARM")
     set(CMAKE_C_STANDARD_LIBRARIES_INIT "kernel32.lib user32.lib")
   elseif(MSVC_VERSION GREATER 1310)
-    set(_RTC1 "/RTC1")
-    set(_FLAGS_CXX " /GR /EHsc")
+    if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "v[0-9]+_clang_.*")
+      # Clang/C2 in MSVC14 Update 1 seems to not support -fsantinize (yet?)
+      # set(_RTC1 "-fsantinize=memory,safe-stack")
+      set(_FLAGS_CXX " -frtti -fexceptions")
+    else()
+      set(_RTC1 "/RTC1")
+      set(_FLAGS_CXX " /GR /EHsc")
+    endif()
     set(CMAKE_C_STANDARD_LIBRARIES_INIT "kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib")
   else()
     set(_RTC1 "/GZ")
@@ -296,11 +302,21 @@ macro(__windows_compiler_msvc lang)
   set(CMAKE_${lang}_LINK_EXECUTABLE
     "${_CMAKE_VS_LINK_EXE}<CMAKE_LINKER> ${CMAKE_CL_NOLOGO} <OBJECTS> ${CMAKE_START_TEMP_FILE} /out:<TARGET> /implib:<TARGET_IMPLIB> /pdb:<TARGET_PDB> /version:<TARGET_VERSION_MAJOR>.<TARGET_VERSION_MINOR>${_PLATFORM_LINK_FLAGS} <CMAKE_${lang}_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>${CMAKE_END_TEMP_FILE}")
 
-  set(CMAKE_${lang}_FLAGS_INIT "${_PLATFORM_DEFINES}${_PLATFORM_DEFINES_${lang}} /D_WINDOWS /W3${_FLAGS_${lang}}")
-  set(CMAKE_${lang}_FLAGS_DEBUG_INIT "/D_DEBUG /MDd /Zi /Ob0 /Od ${_RTC1}")
-  set(CMAKE_${lang}_FLAGS_RELEASE_INIT "/MD /O2 /Ob2 /D NDEBUG")
-  set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "/MD /Zi /O2 /Ob1 /D NDEBUG")
-  set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "/MD /O1 /Ob1 /D NDEBUG")
+  if(CMAKE_VS_PLATFORM_TOOLSET MATCHES "v[0-9]+_clang_.*")
+    # note: MSVC 14 2015 Update 1 sets -fno-ms-compatibility by default, but this does not allow to compile many projects
+    # that include MS's own headers. CMake itself is affected project too.
+    set(CMAKE_${lang}_FLAGS_INIT "${_PLATFORM_DEFINES}${_PLATFORM_DEFINES_${lang}} -fms-extensions -fms-compatibility -D_WINDOWS -Wall${_FLAGS_${lang}}")
+    set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-D_DEBUG /MDd -gline-tables-only -fno-inline -O0 ${_RTC1}")
+    set(CMAKE_${lang}_FLAGS_RELEASE_INIT "/MD -O2 -D NDEBUG")
+    set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "/MD -gline-tables-only -O2 -fno-inline -D NDEBUG")
+    set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "/MD -Os -D NDEBUG")
+  else()
+    set(CMAKE_${lang}_FLAGS_INIT "${_PLATFORM_DEFINES}${_PLATFORM_DEFINES_${lang}} /D_WINDOWS /W3${_FLAGS_${lang}}")
+    set(CMAKE_${lang}_FLAGS_DEBUG_INIT "/D_DEBUG /MDd /Zi /Ob0 /Od ${_RTC1}")
+    set(CMAKE_${lang}_FLAGS_RELEASE_INIT "/MD /O2 /Ob2 /D NDEBUG")
+    set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "/MD /Zi /O2 /Ob1 /D NDEBUG")
+    set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "/MD /O1 /Ob1 /D NDEBUG")
+  endif()
   set(CMAKE_${lang}_LINKER_SUPPORTS_PDB ON)
   set(CMAKE_NINJA_DEPTYPE_${lang} msvc)
 

Source/cmVS14CLFlagTable.h

@@ -28,6 +28,8 @@ static cmVS7FlagTable cmVS14CLFlagTable[] =
    "Custom", "Custom", 0},
   {"Optimization", "Od",
    "Disabled", "Disabled", 0},
+  {"Optimization", "Os",
+   "Minimize Size", "MinSize", 0},
   {"Optimization", "O1",
    "Minimize Size", "MinSpace", 0},
   {"Optimization", "O2",

Source/cmVisualStudio10TargetGenerator.cxx

@@ -2078,7 +2078,18 @@ void cmVisualStudio10TargetGenerator::WriteClOptions(
 
   if(this->MSTools)
     {
-    this->WriteString("<ObjectFileName>$(IntDir)</ObjectFileName>\n", 3);
+    cmsys::RegularExpression clangToolset("v[0-9]+_clang_.*");
+    const char* toolset = this->GlobalGenerator->GetPlatformToolset();
+    if (toolset && clangToolset.find(toolset))
+      {
+      this->WriteString("<ObjectFileName>"
+                        "$(IntDir)%(filename).obj"
+                        "</ObjectFileName>\n", 3);
+      }
+    else
+      {
+      this->WriteString("<ObjectFileName>$(IntDir)</ObjectFileName>\n", 3);
+      }
 
     // If not in debug mode, write the DebugInformationFormat field
     // without value so PDBs don't get generated uselessly.