deprecate microsoft visual studio 2013

CMake/vtkCompilerChecks.cmake

@@ -17,9 +17,14 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND
 endif ()
 
 # Minimum compiler version check: Microsoft C/C++ >= 18.0 (aka VS 2013 aka VS 12.0)
-if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND
-    CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
-  message(FATAL_ERROR "Microsoft Visual Studio 2013 or later is required.")
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
+    message(FATAL_ERROR "Microsoft Visual Studio 2015 or later is required.")
+  else()
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0)
+      message(DEPRECATION "Microsoft Visual Studio 2013 is deprecated in VTK 8.2.0.")
+    endif()
+  endif()
 endif ()
 
 # Minimum compiler version check: Intel C++ (ICC) >= 14

README.md

@@ -63,7 +63,7 @@ Requirements
 In general VTK tries to be as portable as possible; the specific configurations below are known to work and tested.
 
 VTK supports the following C++11 compilers:
-1. Microsoft Visual Studio 2013 or newer
+1. Microsoft Visual Studio 2015 or newer
 2. gcc 4.8.3 or newer
 3. Clang 3.3 or newer
 4. Apple Clang 5.0 (from Xcode 5.0) or newer