mirror of https://github.com/fltk/fltk
New CMake README files. May need some updates or to be moved elsewhere later.
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Albrecht Schlosser
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Using CMake to build FLTK.
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PREREQUISITES
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The prerequisites for building FLTK with CMake are staightforward:
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CMake 2.6 or later and a recent FLTK 1.3 snapshot. Installation of
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CMake is covered on its web site.
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This howto will cover building FLTK with the default options using cmake
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under Linux with both the default Unix Makefiles and a MinGW cross compiling
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toolchain. Other platforms are just as easy to use.
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OPTIONS
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All options have sensible defaults so you won't usually need to touch these.
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There are only two CMake options that you may want to specify.
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CMAKE_BUILD_TYPE
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This specifies what kind of build this is i.e. Release, Debug...
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Platform specific compile/link flags/options are automatically selected
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by CMake depending on this value.
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CMAKE_INSTALL_PREFIX
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Where everything will go on install. Defaults are /usr/local for unix
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and C:\Program Files\FLTK for Windows.
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These are the FLTK specific options. Platform specific options are ignored
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on other platforms.
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OPTION_OPTIM
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Extra optimization flags.
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OPTION_ARCHFLAGS
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Extra architecture flags.
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The OPTION_PREFIX_* flags are for fine-tuning where everything goes
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on the install.
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OPTION_PREFIX_BIN
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OPTION_PREFIX_LIB
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OPTION_PREFIX_INCLUDE
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OPTION_PREFIX_DATA
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OPTION_PREFIX_DOC
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OPTION_PREFIX_CONFIG
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OPTION_PREFIX_MAN
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OPTION_APPLE_X11 - default OFF
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In case you want to use X11 on OSX. Not currently supported.
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OPTION_USE_POLL - default OFF
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Don't use this one either.
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OPTION_BUILD_SHARED_LIBS - default OFF
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Normally FLTK is built as static libraries which makes more portable
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binaries. If you want to use shared libraries, this will build them too.
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OPTION_BUILD_EXAMPLES - default ON
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Builds the many fine example programs.
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OPTION_CAIRO - default OFF
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Enables libcairo support
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OPTION_CAIROEXT - default OFF
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Enables extended libcairo support
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OPTION_USE_GL - default ON
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Enables OpenGL support
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OPTION_USE_THREADS - default ON
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Enables multithreaded support
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OPTION_LARGE_FILE - default ON
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Enables large file (>2G) support
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FLTK has built in jpeg zlib and png libraries. These let you use
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system libraries instead, unless CMake can't find them.
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OPTION_USE_SYSTEM_LIBJPEG - default ON
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OPTION_USE_SYSTEM_ZLIB - default ON
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OPTION_USE_SYSTEM_LIBPNG - default ON
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X11 extended libraries.
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OPTION_USE_XINERAMA - default ON
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OPTION_USE_XFT - default ON
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OPTION_USE_XDBE - default ON
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BUILDING UNDER LINUX WITH UNIX MAKEFILES
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After untaring the FLTK source, go to the root of the FLTK tree and type
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the following.
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mkdir build
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cd build
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cmake ..
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make
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sudo make install
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This will build and install a default configuration FLTK.
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CROSSCOMPILING
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Once you have a crosscompiler going, to use CMAke to build FLTK you need
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two more things. You need a toolchain file which tells CMake where your
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build tools are. The CMake website is a good source of information on
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this file. Here's mine for MinGW under Linux.
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----
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# the name of the target operating system
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set(CMAKE_SYSTEM_NAME Windows)
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# which tools to use
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set(CMAKE_C_COMPILER /usr/bin/i486-mingw32-gcc)
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set(CMAKE_CXX_COMPILER /usr/bin/i486-mingw32-g++)
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# here is where the target environment located
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set(CMAKE_FIND_ROOT_PATH /usr/i486-mingw32)
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# adjust the default behaviour of the FIND_XXX() commands:
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# search programs in the host environment
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set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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# search headers and libraries in the target environment,
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set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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set(CMAKE_INSTALL_PREFIX ${CMAKE_FIND_ROOT_PATH}/usr CACHE FILEPATH
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"install path prefix")
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----
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Not too tough. The other thing you need is a native installation of FLTK
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on your build platform. This is to supply the fluid executable which will
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compile the *.fl into C++ source and header files.
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So, again from the FLTK tree root.
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mkdir mingw
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cd mingw
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cmake -DCMAKE_TOOLCHAIN_FILE=~/projects/toolchain/Toolchain-mingw32.cmake ..
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make
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sudo make install
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This will create a default configuration FLTK suitable for mingw/msys and
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install it in the /usr/i486-mingw32/usr tree.
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@ -0,0 +1,105 @@
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INTRODUCTION TO CMAKE
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CMake was designed to let you create build files for a project once and
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then compile the project on multiple platforms.
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Using it on any platform consists of the same steps. Create the
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CMakeLists.txt build file(s). Run one of the CMake executables, picking
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your source directory, build directory, and build target. The "cmake"
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executable is a one-step process with everything specified on the command
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line. The others let you select options interactively, then configure
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and generate your platform-specific target. You then run the resulting
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Makefile / project file / solution file as you normally would.
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CMake can be run in up to three ways, depending on your platform. "cmake"
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is the basic command line tool. "ccmake" is the curses based interactive
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tool. "cmake-gui" is the gui-based interactive tool. Each of these will
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take command line options in the form of -DOPTION=VALUE. ccmake and
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cmake-gui will also let you change options interactively.
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CMake not only supports, but works best with out-of-tree builds. This means
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that your build directory is not the same as your source directory or with a
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complex project, not the same as your source root directory. Note that the
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build directory is where, in this case, FLTK will be built, not its final
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installation point. If you want to build for multiple targets, such as
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VC++ and MinGW on Windows, or do some cross-compiling you must use out-of-tree
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builds exclusively. In-tree builds will gum up the works by putting a
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CMakeCache.txt file in the source root.
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More information on CMake can be found on its web site http://www.cmake.org.
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USING CMAKE WITH FLTK
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This howto assumes that you have FLTK libraries which were built using
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CMake, installed. Building them with CMake generates some CMake helper
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files which are installed in standard locations, making FLTK easy to find
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and use.
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Here is a basic CMakeLists.txt file using FLTK.
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------
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cmake_minimum_required(VERSION 2.6)
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project(hello)
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find_package(FLTK REQUIRED NO_MODULE)
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include(${FLTK_USE_FILE})
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add_executable(hello WIN32 hello.cxx)
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target_link_libraries(hello fltk)
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------
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The find_package command tells CMake to find the package FLTK, REQUIRED
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means that it is an error if it's not found. NO_MODULE tells it to search
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only for the FLTKConfig file, not using the FindFLTK.cmake supplied with
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CMake, which doesn't work with this version of FLTK.
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Once the package is found we include the ${FLTK_USE_FILE} which adds the
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FLTK include directories and library link information to its knowledge
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base. After that your programs will be able to find FLTK headers and
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when you link the fltk library, it automatically links the libraries
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fltk depends on.
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The WIN32 in the add_executable tells your Windows compiler that this is
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a gui app. It is ignored on other platforms.
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LIBRARY NAMES
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When you use the target_link_libraries command, CMake uses it's own
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internal names for libraries. The fltk library names are:
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fltk fltk_forms fltk_images fltk_gl
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and for the shared libraries (if built):
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fltk_SHARED fltk_forms_SHARED fltk_images_SHARED fltk_gl_SHARED
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The built-in libraries (if built):
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fltk_jpeg fltk_png fltk_z
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USING FLUID FILES
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CMake has a command named fltk_wrap_ui which helps deal with fluid *.fl
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files. An example of its use is in test/CMakeLists.txt. Here is a short
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summary on its use.
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Set a variable to list your C++ files, say CPPFILES.
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Set another variable to list your *.fl files, say FLFILES.
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Say your executable will be called exec.
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Then this is what you do...
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fltk_wrap_ui(exec ${FLFILES})
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add_executable(exec WIN32 ${CPPFILES} ${exec_FLTK_UI_SRCS})
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fltk_wrap_ui calls fluid and generates the required C++ files from the *.fl
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files. It sets the variable, in this case exec_FLTK_UI_SRCS, to the
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list of generated files for inclusion in the add_executable command.
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The variable FLTK_FLUID_EXECUTABLE which is needed by fltk_wrap_ui is set
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when find_package(FLTK REQUIRED NO_MODULE) succeeds.
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