fltk/CMakeLists.txt

#
# Main CMakeLists.txt to build the FLTK project using CMake (www.cmake.org)
# Originally written by Michael Surette
#
# Copyright 1998-2024 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file.  If this
# file is missing or damaged, see the license at:
#
#     https://www.fltk.org/COPYING.php
#
# Please see the following page on how to report bugs and issues:
#
#     https://www.fltk.org/bugs.php
#

#######################################################################
# Set CMake minimum version first: must be before `project()`
#######################################################################

# Note: previous (1.3.5) minimum version
# cmake_minimum_required (VERSION 2.6.3)

# Note: minimum CMake version required by GNUInstallDirs
# cmake_minimum_required (VERSION 2.8.4)

# Minimum CMake version required by FLTK 1.3.7 (since 07/2021)
# cmake_minimum_required (VERSION 3.2.3 FATAL_ERROR)

# Minimum CMake version required by FLTK 1.3.9 (since 12/2023)
cmake_minimum_required (VERSION 3.15.0 FATAL_ERROR)

#######################################################################
# define the FLTK project and version
#######################################################################

project (FLTK VERSION 1.3.10)

#######################################################################
# include macro and function definitions for general usage
#######################################################################

include (CMake/fl_debug_var.cmake)
include (CMake/fl_add_library.cmake)

if (0)
  fl_debug_var (FLTK_VERSION_MAJOR)
  fl_debug_var (FLTK_VERSION_MINOR)
  fl_debug_var (FLTK_VERSION_PATCH)
  fl_debug_var (FLTK_VERSION)
  fl_debug_var (CMAKE_VERSION)
endif ()

#######################################################################
# basic setup
#######################################################################
include (CMake/setup.cmake)

#######################################################################
# check for headers, libraries and functions
#######################################################################
include (CMake/resources.cmake)

#######################################################################
# options
#######################################################################
include (CMake/options.cmake)

#######################################################################
# print (debug) several build variables and options
#######################################################################

set (debug_build 0) # set to 1 to show debug info

if (debug_build)
  message ("")
  message (STATUS "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt: set 'debug_build' to 0 to disable the following info:")
  fl_debug_var (WIN32)
  fl_debug_var (MINGW)
  fl_debug_var (CYGWIN)
  fl_debug_var (MSVC)
  fl_debug_var (UNIX)
  fl_debug_var (APPLE)
  fl_debug_var (CMAKE_BUILD_TYPE)
  fl_debug_var (CMAKE_SIZEOF_VOID_P)
  fl_debug_var (OPTION_OPTIM)
  fl_debug_var (CMAKE_C_FLAGS)
  fl_debug_var (CMAKE_CXX_FLAGS)
  fl_debug_var (CMAKE_EXE_LINKER_FLAGS)
  message (STATUS "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt: end of debug_build info.")
endif (debug_build)

unset (debug_build)

#######################################################################
# variables shared by export and install
# export.cmake creates configuration files for direct use in a built but uninstalled FLTK
# install.cmake creates these files for an installed FLTK
# these two would only differ in paths, so common variables are set here
#######################################################################
include (CMake/variables.cmake)

#######################################################################
# final config and export
#######################################################################
include (CMake/export.cmake)

configure_file (
  ${CMAKE_CURRENT_SOURCE_DIR}/abi-version.cmake.in
  ${CMAKE_CURRENT_BINARY_DIR}/FL/abi-version.h
  @ONLY
)

#######################################################################
# options to build test/demo and example programs
#######################################################################

if (FLTK_BUILD_TEST)
  add_subdirectory (test)
endif (FLTK_BUILD_TEST)

if (FLTK_BUILD_EXAMPLES)
  add_subdirectory (examples)
endif (FLTK_BUILD_EXAMPLES)

#######################################################################
# create and install version config file 'FLTKConfigVersion.cmake'
#######################################################################

include(CMakePackageConfigHelpers)

write_basic_package_version_file(FLTKConfigVersion.cmake
  # [VERSION requiredVersion]       # defaults to project version
  COMPATIBILITY SameMinorVersion
)

install(FILES
  ${CMAKE_CURRENT_BINARY_DIR}/FLTKConfigVersion.cmake
  DESTINATION ${FLTK_CONFIG_PATH}
)

#######################################################################
# installation
#######################################################################
include (CMake/install.cmake)

#######################################################################
# Output Configuration Summary
#######################################################################

include (FeatureSummary)

message ("")
set (_descr "${PROJECT_NAME} ${FLTK_VERSION} generated by CMake ${CMAKE_VERSION}")
feature_summary (WHAT ALL DESCRIPTION "Configuration Summary for ${_descr} --\n")

message (STATUS "Static libraries will be built in ${CMAKE_CURRENT_BINARY_DIR}/lib")

if (OPTION_BUILD_SHARED_LIBS)
  message (STATUS "Shared libraries will be built in ${CMAKE_CURRENT_BINARY_DIR}/lib")
else ()
  message (STATUS "Shared libraries will not be built (set OPTION_BUILD_SHARED_LIBS=ON to build)")
endif ()

if (FLTK_BUILD_TEST)
  message (STATUS "Test programs    will be built in ${CMAKE_CURRENT_BINARY_DIR}/bin/test")
endif ()

if (FLTK_BUILD_EXAMPLES)
  message (STATUS "Example programs will be built in ${CMAKE_CURRENT_BINARY_DIR}/bin/examples")
else ()
  message (STATUS "Example programs will not be built (set FLTK_BUILD_EXAMPLES=ON to build)")
endif ()

message (STATUS "")

if (CMAKE_BUILD_TYPE STREQUAL "")
  message (STATUS "Build configuration     : <unspecified>")
else ()
  message (STATUS "Build configuration     : ${CMAKE_BUILD_TYPE}")
endif ()

message (STATUS "")

if (FLTK_USE_BUILTIN_JPEG)
  message (STATUS "Image Libraries         : JPEG = Builtin")
else ()
  message (STATUS "Image Libraries         : JPEG = System")
endif ()

if (FLTK_USE_BUILTIN_PNG)
  message (STATUS "                        : PNG  = Builtin")
else ()
  message (STATUS "                        : PNG  = System")
endif ()

if (FLTK_USE_BUILTIN_ZLIB)
  message (STATUS "                        : ZLIB = Builtin")
else ()
  message (STATUS "                        : ZLIB = System")
endif ()

if (FLTK_HAVE_CAIROEXT)
  message (STATUS "Fl_Cairo_Window support : Yes (extended)")
elseif (FLTK_HAVE_CAIRO)
  message (STATUS "Fl_Cairo_Window support : Yes (standard)")
else ()
  message (STATUS "Fl_Cairo_Window support : No")
endif ()

message ("")
message (STATUS "End of Configuration Summary --\n")