cmake: add support for Visual Studio 2019

Author: ra1nb0w

Diff for: CMakeLists.txt

@@ -157,8 +157,8 @@ elseif(APPLE)
   message(STATUS "RPATH support: ${CMAKE_MACOSX_RPATH}")
 
 elseif (WIN32)
-  if(NOT VS2015 AND NOT VS2017)
-    message(FATAL_ERROR "You must use Microsoft Visual Studio 2015 or 2017 as compiler")
+  if(NOT VS2015 AND NOT VS2017 AND NOT VS2019)
+    message(FATAL_ERROR "You must use Microsoft Visual Studio 2015, 2017 or 2019 as compiler")
   endif()
 
   # compile with full multicore

Diff for: cmake/modules/FindCompiler.cmake

@@ -5,7 +5,9 @@ elseif(NOT DEFINED C_GCC AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
   set(C_GCC 1)
 elseif(NOT DEFINED C_MSVC AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
   set(C_MSVC 1)
-  if(MSVC_VERSION GREATER 1910 AND MSVC_VERSION LESS 1919)
+  if(MSVC_VERSION GREATER_EQUAL 1920 AND MSVC_VERSION LESS_EQUAL 1929)
+    set(VS2019 ON)
+  elseif(MSVC_VERSION GREATER_EQUAL 1910 AND MSVC_VERSION LESS_EQUAL 1919)
     set(VS2017 ON)
   elseif(MSVC_VERSION GREATER 1899 AND MSVC_VERSION LESS 1910)
     set(VS2015 ON)