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Make MSVC static linkage optional

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -279,7 +279,7 @@

 if (MSVC)

 	if (STATIC)

-		message(WARNING "Static builds are not available for MSVC")

+		message(STATUS "MSVC static builds only embed the C runtime library: SDL2 and FreeType are still dynamically linked")

 	endif()

 	# Find dependencies

@@ -296,14 +296,16 @@

 		set(FREETYPE_LIBRARIES "${CMAKE_CURRENT_SOURCE_DIR}/msvc/freetype/win32/freetype.lib")

 	endif()

-	# Static-link the CRT, so we don't need to lug around 10 different DLLs

-	foreach(FLAG_VAR

-			CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE

-			CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)

-		if(${FLAG_VAR} MATCHES "/MD")

-			string(REGEX REPLACE "/MD" "/MT" ${FLAG_VAR} "${${FLAG_VAR}}")

-		endif()

-	endforeach()

+	if(STATIC)

+		# Static-link the CRT, so we don't need to lug around 10 different DLLs

+		foreach(FLAG_VAR

+				CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE

+				CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)

+			if(${FLAG_VAR} MATCHES "/MD")

+				string(REGEX REPLACE "/MD" "/MT" ${FLAG_VAR} "${${FLAG_VAR}}")

+			endif()

+		endforeach()

+	endif()

 	# Work around MSVC2003's lack of stdint.h

 	include(CheckIncludeFiles)