Merged CMakeLists.txt from issue 87 - now it's cleaner, and supports Windows much better

CMakeLists.txt

+###
+### CMake settings
+###
+## Due to Mac OSX we need to keep compatibility with CMake 2.6
+# see http://www.cmake.org/Wiki/CMake_Policies
 cmake_minimum_required(VERSION 2.6)
+# see http://www.cmake.org/cmake/help/cmake-2-8-docs.html#policy:CMP0012
+if(POLICY CMP0012)
+	cmake_policy(SET CMP0012 OLD)
+endif()
+# see http://www.cmake.org/cmake/help/cmake-2-8-docs.html#policy:CMP0015
+if(POLICY CMP0015)
+	cmake_policy(SET CMP0015 OLD)
+endif()
 
-project (YAML_CPP)
+include(CheckCXXCompilerFlag)
 
-set(LIB_TYPE SHARED)
 
-if(IPHONE)
-  set(CMAKE_OSX_SYSROOT iphoneos4.2)
-  set(CMAKE_OSX_ARCHITECTURES "armv6;armv7")
-  set(LIB_TYPE)
-endif(IPHONE)
-
-if(CMAKE_COMPILER_IS_GNUCC)
-  set(CMAKE_CXX_FLAGS "-O2 -Wall -Wextra -pedantic -Wno-long-long ${CMAKE_CXX_FLAGS}")
-endif(CMAKE_COMPILER_IS_GNUCC)
-
-if(MSVC)
-  set(LIB_TYPE) # I can't figure out how CMake handles Windows shared libraries
-  set(CMAKE_CXX_FLAGS "/W3 /wd4127 /wd4355 /D_SCL_SECURE_NO_WARNINGS ${CMAKE_CXX_FLAGS}")
-endif(MSVC)
+###
+### Project settings
+###
+project(YAML_CPP)
 
 set(YAML_CPP_VERSION_MAJOR "0")
 set(YAML_CPP_VERSION_MINOR "2")
@@ -26,43 +28,199 @@ set(YAML_CPP_VERSION "${YAML_CPP_VERSION_MAJOR}.${YAML_CPP_VERSION_MINOR}.${YAML
 
 enable_testing()
 
-option(YAML_CPP_BUILD_TOOLS "Enables or disables testing and parse tools" true)
 
+###
+### Project options
+###
+## Project stuff
+option(YAML_CPP_BUILD_TOOLS "Enable testing and parse tools" ON)
+
+## Build options
+# --> General
+# see http://www.cmake.org/cmake/help/cmake2.6docs.html#variable:BUILD_SHARED_LIBS
+#     http://www.cmake.org/cmake/help/cmake2.6docs.html#command:add_library
+option(BUILD_SHARED_LIBS "Build Shared Libraries" OFF)
+
+# --> Apple
+option(APPLE_UNIVERSAL_BIN "Apple: Build universal binary" OFF)
+
+# --> Microsoft Visual C++
+# see http://msdn.microsoft.com/en-us/library/aa278396(v=VS.60).aspx
+#     http://msdn.microsoft.com/en-us/library/2kzt1wy3(v=VS.71).aspx
+option(MSVC_SHARED_RT "MSVC: Build with shared runtime libs (/MD)" ON)
+option(MSVC_STHREADED_RT "MSVC: Build with single-threaded static runtime libs (/ML until VS .NET 2003)" OFF)
+
+
+###
+### Sources, headers, directories and libs
+###
+file(GLOB sources "src/[a-zA-Z]*.cpp")
+file(GLOB public_headers "include/yaml-cpp/[a-zA-Z]*.h")
+file(GLOB private_headers "src/[a-zA-Z]*.h")
+
+if(VERBOSE)
+	message(STATUS "sources: ${sources}")
+	message(STATUS "public_headers: ${public_headers}")
+	message(STATUS "private_headers: ${private_headers}")
+endif()
+
+include_directories(${YAML_CPP_SOURCE_DIR}/include)
+
+
+###
+### General compilation settings
+###
+if(BUILD_SHARED_LIBS)
+	set(LABEL_SUFFIX "shared")
+else()
+	set(LABEL_SUFFIX "static")
+endif()
+
+if(APPLE)
+	if(APPLE_UNIVERSAL_BIN)
+		set(CMAKE_OSX_ARCHITECTURES ppc;i386)
+	endif()
+endif()
+
+if(IPHONE)
+	set(CMAKE_OSX_SYSROOT "iphoneos4.2")
+	set(CMAKE_OSX_ARCHITECTURES "armv6;armv7")
+endif()
+
+if(WIN32)
+	if(BUILD_SHARED_LIBS)
+		add_definitions(-D${PROJECT_NAME}_DLL)	# use or build Windows DLL
+	endif()
+	if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+		set(CMAKE_INSTALL_PREFIX "C:/")
+	endif()
+endif()
+
+# GCC specialities
+if(CMAKE_COMPILER_IS_GNUCXX)
+	### General stuff
+	if(WIN32)
+		set(CMAKE_SHARED_LIBRARY_PREFIX "")	# DLLs do not have a "lib" prefix
+		set(CMAKE_IMPORT_LIBRARY_PREFIX "")	# same for DLL import libs
+		set(CMAKE_LINK_DEF_FILE_FLAG "")	# CMake workaround (2.8.3)
+	endif()
+
+	### Project stuff
+	set(GCC_EXTRA_OPTIONS "")
+	#
+	set(FLAG_TESTED "-Wextra")
+	check_cxx_compiler_flag(${FLAG_TESTED} FLAG_WEXTRA)
+	if(FLAG_WEXTRA)
+		set(GCC_EXTRA_OPTIONS "${GCC_EXTRA_OPTIONS} ${FLAG_TESTED}")
+	endif()
+	#
+	set(CMAKE_CXX_FLAGS "-O2 -Wall ${GCC_EXTRA_OPTIONS} -pedantic -Wno-long-long ${CMAKE_CXX_FLAGS}")
+endif()
+
+# Microsoft VisualC++ specialities
+if(MSVC)
+	### General stuff
+	# a) Change MSVC runtime library settings (/MD[d], /MT[d], /ML[d] (single-threaded until VS 2003))
+	#    plus set lib suffix for later use and project label accordingly
+	# see http://msdn.microsoft.com/en-us/library/aa278396(v=VS.60).aspx
+	#     http://msdn.microsoft.com/en-us/library/2kzt1wy3(v=VS.71).aspx
+	set(LIB_RT_SUFFIX "md")	# CMake defaults to /MD for MSVC
+	set(LIB_RT_OPTION "/MD")
+	#
+	if(NOT MSVC_SHARED_RT)	# User wants to have static runtime libraries (/MT, /ML)
+		if(MSVC_STHREADED_RT)	# User wants to have old single-threaded static runtime libraries
+			set(LIB_RT_SUFFIX "ml")
+			set(LIB_RT_OPTION "/ML")
+			if(NOT ${MSVC_VERSION} LESS 1400)
+				message(FATAL_ERROR "Single-threaded static runtime libraries (/ML) only available until VS .NET 2003 (7.1).")
+			endif()
+		else()
+			set(LIB_RT_SUFFIX "mt")
+			set(LIB_RT_OPTION "/MT")
+		endif()
+
+		# correct linker options
+		foreach(flag_var  CMAKE_C_FLAGS  CMAKE_CXX_FLAGS)
+			foreach(config_name  ""  DEBUG  RELEASE  MINSIZEREL  RELWITHDEBINFO)
+				set(var_name "${flag_var}")
+				if(NOT "${config_name}" STREQUAL "")
+					set(var_name "${var_name}_${config_name}")
+				endif()
+				string(REPLACE "/MD" "${LIB_RT_OPTION}" ${var_name} "${${var_name}}")
+			endforeach()
+		endforeach()
+	endif()
+	#
+	set(LABEL_SUFFIX "${LABEL_SUFFIX} ${LIB_RT_OPTION}")
+
+	# b) Change prefix for static libraries
+	set(CMAKE_STATIC_LIBRARY_PREFIX "lib")	# to distinguish static libraries from DLL import libs
+
+	# c) Correct suffixes for static libraries
+	if(NOT BUILD_SHARED_LIBS)
+		### General stuff
+		set(LIB_TARGET_SUFFIX "${LIB_SUFFIX}${LIB_RT_SUFFIX}")
+	endif()
+
+	### Project stuff
+	# /W3 = set warning level; see http://msdn.microsoft.com/en-us/library/thxezb7y.aspx
+	# /wd4127 = disable warning C4127 "conditional expression is constant"; see http://msdn.microsoft.com/en-us/library/6t66728h.aspx
+	# /wd4355 = disable warning C4355 "'this' : used in base member initializer list"; http://msdn.microsoft.com/en-us/library/3c594ae3.aspx
+	set(CMAKE_CXX_FLAGS "/W3 /wd4127 /wd4355 /D_SCL_SECURE_NO_WARNINGS ${CMAKE_CXX_FLAGS}")
+endif()
+
+
+###
+### General install settings
+###
 if(WIN32)
 	set(_library_dir bin)	# .dll are in PATH, like executables
-else(WIN32)
+else()
 	set(_library_dir lib)
-endif(WIN32)
+endif()
 
 set(INCLUDE_INSTALL_DIR include/yaml-cpp)
-set(LIB_INSTALL_DIR ${_library_dir}${LIB_SUFFIX})
+set(LIB_INSTALL_DIR "${_library_dir}${LIB_SUFFIX}")
 
-#
 set(_INSTALL_DESTINATIONS
 	RUNTIME DESTINATION bin
 	LIBRARY DESTINATION ${LIB_INSTALL_DIR}
-	ARCHIVE DESTINATION lib${LIB_SUFFIX}
+	ARCHIVE DESTINATION "lib${LIB_SUFFIX}"
 )
-#
-file(GLOB public_headers include/yaml-cpp/[a-z]*.h)
-file(GLOB private_headers src/[a-z]*.h)
-file(GLOB sources src/[a-z]*.cpp)
 
-include_directories(${YAML_CPP_SOURCE_DIR}/include)
+
+###
+### Library
+###
 add_library(yaml-cpp
-	${LIB_TYPE}
+	${sources}
 	${public_headers}
 	${private_headers}
-	${sources}
 )
+
 set_target_properties(yaml-cpp PROPERTIES
 	VERSION "${YAML_CPP_VERSION}"
 	SOVERSION "${YAML_CPP_VERSION_MAJOR}.${YAML_CPP_VERSION_MINOR}"
+	PROJECT_LABEL "yaml-cpp ${LABEL_SUFFIX}"
 )
 
 if(IPHONE)
-set_target_properties(yaml-cpp PROPERTIES XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET "3.0")
-endif(IPHONE)
+	set_target_properties(yaml-cpp PROPERTIES
+		XCODE_ATTRIBUTE_IPHONEOS_DEPLOYMENT_TARGET "3.0"
+	)
+endif()
+
+if(MSVC)
+	if(NOT BUILD_SHARED_LIBS)
+		# correct library names
+		set_target_properties(yaml-cpp PROPERTIES
+			DEBUG_POSTFIX "${LIB_TARGET_SUFFIX}d"
+			RELEASE_POSTFIX "${LIB_TARGET_SUFFIX}"
+			MINSIZEREL_POSTFIX "${LIB_TARGET_SUFFIX}"
+			RELWITHDEBINFO_POSTFIX "${LIB_TARGET_SUFFIX}"
+		)
+	endif()
+endif()
 
 install(TARGETS yaml-cpp ${_INSTALL_DESTINATIONS})
 install(
@@ -74,9 +232,13 @@ if(UNIX)
 	set(PC_FILE ${CMAKE_BINARY_DIR}/yaml-cpp.pc)
 	configure_file("yaml-cpp.pc.cmake" ${PC_FILE} @ONLY)
 	install(FILES ${PC_FILE} DESTINATION ${LIB_INSTALL_DIR}/pkgconfig)
-endif(UNIX)
+endif()
+
 
+###
+### Extras
+###
 if(YAML_CPP_BUILD_TOOLS)
-	add_subdirectory (test)
-	add_subdirectory (util)
-endif(YAML_CPP_BUILD_TOOLS)
+	add_subdirectory(test)
+	add_subdirectory(util)
+endif()