[CMAKE] Disable policy CMP0091 and set /MT flag explicitly for Visual Studio generator

CMakeLists.txt

@@ -7,6 +7,13 @@ endif()
 
 include(CMakeDependentOption)
 
+# CMAKE_CROSSCOMPILING and MSVC_IDE are not set until project() is called, so let's test this instead
+if ((DEFINED CMAKE_TOOLCHAIN_FILE) AND (CMAKE_GENERATOR MATCHES "Visual Studio.*"))
+# Do not use MSVC_RUNTIME_LIBRARY target property. We use our own flags instead
+message(WARNING "Setting policy CMP0091 to OLD behaviour")
+cmake_policy(SET CMP0091 OLD)
+endif()
+
 project(REACTOS)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
@@ -120,6 +127,12 @@ else()
     # Print build type
     message("-- Build Type: ${CMAKE_BUILD_TYPE}")
 
+    # Always add /MT in VS CMAKE_GENERATOR
+    if (MSVC_IDE)
+        add_compile_options("/MT")
+    endif()
+
+
     # adjust the default behaviour of the FIND_XXX() commands:
     # search headers and libraries in the target environment, search
     # programs in the host environment

toolchain-msvc.cmake

@@ -64,7 +64,6 @@ else()
     set(CMAKE_ASM_MASM_FLAGS_INIT "/Cp")
 endif()
 
-
 set(CMAKE_C_STANDARD_LIBRARIES "" CACHE INTERNAL "")
 
 set(CMAKE_USER_MAKE_RULES_OVERRIDE "${CMAKE_CURRENT_LIST_DIR}/overrides-msvc.cmake")