[cmake] use CMAKE_MSVC_RUNTIME_LIBRARY

* Increase required CMake version to 3.15 (windows only)
* Use
  https://cmake.org/cmake/help/latest/prop_tgt/MSVC_RUNTIME_LIBRARY.html#prop_tgt:MSVC_RUNTIME_LIBRARY
  to select windows runtime

CMakeCPack.cmake

@@ -61,7 +61,9 @@ set(CPACK_NSIS_MUI_UNICON "${PROJECT_SOURCE_DIR}/resource\\\\FreeRDP_Icon_96px.i
 set(CPACK_COMPONENTS_ALL client server libraries headers symbols tools)
 
 if(MSVC)
-	if(MSVC_RUNTIME STREQUAL "dynamic")
+	string(FIND ${CMAKE_MSVC_RUNTIME_LIBRARY} "DLL" IS_SHARED)
+
+	if(NOT IS_SHARED STREQUAL "-1")
 		set(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_SKIP TRUE)
 		include(InstallRequiredSystemLibraries)
 

CMakeLists.txt

@@ -230,25 +230,7 @@ if(FREEBSD)
 endif()
 
 # Configure MSVC Runtime
-if(MSVC)
-	include(MSVCRuntime)
-	if(NOT DEFINED MSVC_RUNTIME)
-		set(MSVC_RUNTIME "dynamic" CACHE STRING "MSVC runtime type [dynamic|static]")
-	endif()
-	if(MSVC_RUNTIME STREQUAL "static")
-		if(BUILD_SHARED_LIBS)
-			message(FATAL_ERROR "Static CRT is only supported in a fully static build")
-		endif()
-		message(STATUS "Use the MSVC static runtime option carefully!")
-		message(STATUS "OpenSSL uses /MD by default, and is very picky")
-		message(STATUS "Random freeing errors are a common sign of runtime issues")
-	endif()
-	configure_msvc_runtime()
-
-	if(NOT DEFINED CMAKE_SUPPRESS_REGENERATION)
-		set(CMAKE_SUPPRESS_REGENERATION ON)
-	endif()
-endif()
+include(MSVCRuntime)
 
 # Enable 64bit file support on linux and FreeBSD.
 if("${CMAKE_SYSTEM_NAME}" MATCHES "Linux" OR FREEBSD)

ci/cmake-preloads/config-windows.txt

@@ -1,6 +1,5 @@
 message("PRELOADING windows cache")
 set (CMAKE_WINDOWS_VERSION "WIN7" CACHE STRING "windows build version")
-set (MSVC_RUNTIME "static" CACHE STRING "link MSVC runtime static")
 set (BUILD_SHARED_LIBS OFF CACHE BOOL "build static linked executable")
 set (CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded" CACHE STRING "MSVC runtime to use")
 set (OPENSSL_USE_STATIC_LIBS ON CACHE BOOL "link OpenSSL static")

client/SDL/CMakeLists.txt

@@ -44,25 +44,7 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 
 # Configure MSVC Runtime
-if(MSVC)
-	include(MSVCRuntime)
-	if(NOT DEFINED MSVC_RUNTIME)
-		set(MSVC_RUNTIME "dynamic" CACHE STRING "MSVC runtime type [dynamic|static]")
-	endif()
-	if(MSVC_RUNTIME STREQUAL "static")
-		if(BUILD_SHARED_LIBS)
-			message(FATAL_ERROR "Static CRT is only supported in a fully static build")
-		endif()
-		message(STATUS "Use the MSVC static runtime option carefully!")
-		message(STATUS "OpenSSL uses /MD by default, and is very picky")
-		message(STATUS "Random freeing errors are a common sign of runtime issues")
-	endif()
-	configure_msvc_runtime()
-
-	if(NOT DEFINED CMAKE_SUPPRESS_REGENERATION)
-		set(CMAKE_SUPPRESS_REGENERATION ON)
-	endif()
-endif()
+include(MSVCRuntime)
 
 if(WITH_WIN_CONSOLE)
   set(WIN32_GUI_FLAG "")

client/Sample/CMakeLists.txt

@@ -27,6 +27,8 @@ option(CMAKE_VERBOSE_MAKEFILE "verbose CMake makefile" ON)
 option(CMAKE_POSITION_INDEPENDENT_CODE "build with position independent code (-fPIC or -fPIE)" ON)
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../cmake/)
 
+include(MSVCRuntime)
+
 if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release" CACHE STRING "project default" FORCE)
 endif()

cmake/MSVCRuntime.cmake

@@ -1,48 +1,47 @@
-
-macro(configure_msvc_runtime)
-	if(MSVC)
-		# Default to statically-linked runtime.
-		if("${MSVC_RUNTIME}" STREQUAL "")
-			set(MSVC_RUNTIME "dynamic")
-		endif()
-
-		# Set compiler options.
-		set(variables
-			CMAKE_C_FLAGS
-			CMAKE_C_FLAGS_DEBUG
-			CMAKE_C_FLAGS_MINSIZEREL
-			CMAKE_C_FLAGS_RELEASE
-			CMAKE_C_FLAGS_RELWITHDEBINFO
-			CMAKE_CXX_FLAGS
-			CMAKE_CXX_FLAGS_DEBUG
-			CMAKE_CXX_FLAGS_MINSIZEREL
-			CMAKE_CXX_FLAGS_RELEASE
-			CMAKE_CXX_FLAGS_RELWITHDEBINFO)
-
-		if(${MSVC_RUNTIME} STREQUAL "static")
-			message(STATUS "MSVC: using statically-linked runtime (/MT and /MTd).")
-			foreach(variable ${variables})
-				if(${variable} MATCHES "/MD")
-					string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
-				endif()
-			endforeach()
-		else()
-			message(STATUS "MSVC: using dynamically-linked runtime (/MD and /MDd).")
-			foreach(variable ${variables})
-				if(${variable} MATCHES "/MT")
-					string(REGEX REPLACE "/MT" "/MD" ${variable} "${${variable}}")
-				endif()
-			endforeach()
-		endif()
-
-		foreach(variable ${variables})
-			if(${variable} MATCHES "/Ob0")
-				string(REGEX REPLACE "/Ob0" "/Ob2" ${variable} "${${variable}}")
-			endif()
-		endforeach()
-
-		foreach(variable ${variables})
-			set(${variable} "${${variable}}" CACHE STRING "MSVC_${variable}" FORCE)
-		endforeach()
+if (WIN32)
+	if (CMAKE_VERSION VERSION_LESS 3.15.0)
+		message(FATAL_ERROR "windows builds require CMake >= 3.15")
 	endif()
-endmacro(configure_msvc_runtime)
+	if(NOT DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
+		if (MSVC_RUNTIME STREQUAL "dynamic")
+			set(MSVC_DEFAULT_RUNTIME "MultiThreadedDLL")
+		elseif(MSVC_RUNTIME STREQUAL "static")
+			set(MSVC_DEFAULT_RUNTIME "MultiThreaded")
+		else()
+			message(WARNING "invalid MSVC_RUNTIME (deprecated) value '${MSVC_RUNTIME}', ignoring")
+		endif()
+
+		if(MSVC_DEFAULT_RUNTIME)
+			message("Using CMAKE_MSVC_RUNTIME_LIBRARY=${MSVC_DEFAULT_RUNTIME} (derived from MSVC_RUNTIME (deprecated) value '${MSVC_RUNTIME}')" )
+		else()
+			set(MSVC_DEFAULT_RUNTIME "MultiThreaded")
+
+			if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+				string(APPEND MSVC_DEFAULT_RUNTIME "Debug")
+			endif()
+
+			if (BUILD_SHARED_LIBS)
+				string(APPEND MSVC_DEFAULT_RUNTIME "DLL")
+			endif()
+			message("Using CMAKE_MSVC_RUNTIME_LIBRARY=${MSVC_DEFAULT_RUNTIME}" )
+		endif()
+
+		set(CMAKE_MSVC_RUNTIME_LIBRARY ${MSVC_DEFAULT_RUNTIME} CACHE STRING "MSVC runtime")
+	endif()
+
+	message("build is using MSVC runtime ${CMAKE_MSVC_RUNTIME_LIBRARY}")
+
+	string(FIND ${CMAKE_MSVC_RUNTIME_LIBRARY} "DLL" IS_SHARED)
+	if(IS_SHARED STREQUAL "-1")
+		if(BUILD_SHARED_LIBS)
+			message(FATAL_ERROR "Static CRT is only supported in a fully static build")
+		endif()
+		message(STATUS "Use the MSVC static runtime option carefully!")
+		message(STATUS "OpenSSL uses /MD by default, and is very picky")
+		message(STATUS "Random freeing errors are a common sign of runtime issues")
+	endif()
+
+	if(NOT DEFINED CMAKE_SUPPRESS_REGENERATION)
+		set(CMAKE_SUPPRESS_REGENERATION ON)
+	endif()
+endif()

packaging/windows/preload.cmake

@@ -1,7 +1,6 @@
 message("PRELOADING windows cache")
 set (CMAKE_WINDOWS_VERSION "WIN7" CACHE STRING "windows build version")
 set (BUILD_SHARED_LIBS OFF CACHE BOOL "build static linked executable")
-set (MSVC_RUNTIME "static" CACHE STRING "link MSVC runtime static")
 set (CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded" CACHE STRING "MSVC runtime to use")
 set (OPENSSL_USE_STATIC_LIBS ON CACHE BOOL "link OpenSSL static")
 set (CHANNEL_URBDRC OFF CACHE BOOL "we do not build libusb support")

server/proxy/modules/bitmap-filter/CMakeLists.txt

@@ -32,6 +32,8 @@ endif()
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+include(MSVCRuntime)
+
 add_library(${PROJECT_NAME} MODULE
 	bitmap-filter.cpp
 )

server/proxy/modules/capture/CMakeLists.txt

@@ -33,6 +33,8 @@ if (supported)
     set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
 endif()
 
+include(MSVCRuntime)
+
 add_library(${PROJECT_NAME} MODULE
 	cap_main.c
 	cap_config.c

server/proxy/modules/demo/CMakeLists.txt

@@ -32,6 +32,8 @@ endif()
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+include(MSVCRuntime)
+
 add_library(${PROJECT_NAME} MODULE
 	demo.cpp
 )

server/proxy/modules/dyn-channel-dump/CMakeLists.txt

@@ -31,6 +31,8 @@ endif()
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+include(MSVCRuntime)
+
 add_library(${PROJECT_NAME} MODULE
 	dyn-channel-dump.cpp
 )

winpr/CMakeLists.txt

@@ -49,6 +49,8 @@ if (NOT FREERDP_UNIFIED_BUILD)
 			set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden")
 		endif()
 	endif()
+
+	include(MSVCRuntime)
 endif()
 
 set(DEFAULT_DEBUG_OPTION OFF)