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fltk/CMakeLists.txt
Albrecht Schlosser 0f1492bba6 Update 'cmake_minimum_required' version to 3.12.0 
Linking against OBJECT libraries as done in fluid since May 2023
and in shared library builds using MSVC even much earlier
requires at least CMake 3.12.

This commit adds the requirement explicitly to abort the build early.
2023-08-26 18:07:54 +02:00

319 lines
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CMake
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#
# Main CMakeLists.txt to build the FLTK project using CMake (www.cmake.org)
# Originally written by Michael Surette
#
# Copyright 1998-2023 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()`
#######################################################################
# Minimum CMake version required by FLTK 1.4
# Note 1: Linking against OBJECT libraries (fluid, test) requires
# at least CMake 3.12.0
# Note 2: Used in fluid since 05/2023,
# used for Windows (MSVC) shared lib builds much earlier
cmake_minimum_required (VERSION 3.12.0 FATAL_ERROR) # 05/2023
#######################################################################
# Use "legacy mode" of FindOpenGL (avoid CMake developer warning).
# Note: we're using FindOpenGL with `OPENGL_LIBRARIES` and not (yet)
# the `OpenGL::GL` target. This may be changed in the future.
# See https://cmake.org/cmake/help/latest/policy/CMP0072.html
# Update Feb 28, 2021: To avoid a warning about "OLD" policies we set
# OpenGL_GL_PREFERENCE directly to "LEGACY" (other option: "GLVND").
# if (POLICY CMP0072)
# cmake_policy (SET CMP0072 OLD)
# endif ()
set (OpenGL_GL_PREFERENCE LEGACY)
#######################################################################
# define the FLTK project and version
#######################################################################
project (FLTK VERSION 1.4.0)
#######################################################################
# include macro and function definitions for general usage
#######################################################################
include (CMake/fl_debug_var.cmake)
include (CMake/fl_debug_pkg.cmake)
include (CMake/fl_add_library.cmake)
include (CMake/compatibility.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)
#######################################################################
# Build a dummy ("empty") Cairo library for backwards compatibility.
# This should be removed some time after 1.4.0 was released, maybe
# in FLTK 1.4.1, 1.4.2, 1.5.0, or whatever the next minor release is.
#######################################################################
if (FLTK_HAVE_CAIRO)
add_subdirectory (cairo)
endif ()
#######################################################################
# build the standard FLTK libraries
#######################################################################
add_subdirectory(src)
#######################################################################
# build fluid
#######################################################################
if (FLTK_BUILD_FLUID)
add_subdirectory (fluid)
endif (FLTK_BUILD_FLUID)
#######################################################################
# build fltk-options
#######################################################################
if (FLTK_BUILD_FLTK_OPTIONS)
add_subdirectory (fltk-options)
endif (FLTK_BUILD_FLTK_OPTIONS)
#######################################################################
# 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}/fl_config.cmake.in
${CMAKE_CURRENT_BINARY_DIR}/FL/fl_config.h
@ONLY
)
#######################################################################
# options to build test/demo and example programs
#######################################################################
if (FLTK_BUILD_TEST)
add_subdirectory (test)
endif (FLTK_BUILD_TEST)
if (FLTK_BUILD_EXAMPLES)
add_subdirectory (examples)
endif (FLTK_BUILD_EXAMPLES)
#######################################################################
# installation
#######################################################################
include (CMake/install.cmake)
#######################################################################
# Generate Library Export Headers *** EXPERIMENTAL *** WIP ***
#######################################################################
# Enable (1) or disable (0) generation of experimental headers (WIP)
set (GENERATE_EXPORT_HEADERS 0)
if (OPTION_BUILD_SHARED_LIBS AND GENERATE_EXPORT_HEADERS)
include (GenerateExportHeader)
generate_export_header (fltk_SHARED
BASE_NAME fl
EXPORT_FILE_NAME FL/fltk_export.h
STATIC_DEFINE FL_STATIC_LIB
)
if (NOT MSVC)
# Visual Studio builds only one shared lib (DLL)
generate_export_header (fltk_images_SHARED
BASE_NAME fl_images
EXPORT_FILE_NAME FL/fltk_images_export.h
STATIC_DEFINE FL_STATIC_LIB
)
generate_export_header (fltk_forms_SHARED
BASE_NAME fl_forms
EXPORT_FILE_NAME FL/fltk_forms_export.h
STATIC_DEFINE FL_STATIC_LIB
)
generate_export_header (fltk_gl_SHARED
BASE_NAME fl_gl
EXPORT_FILE_NAME FL/fltk_gl_export.h
STATIC_DEFINE FL_STATIC_LIB
)
endif (NOT MSVC)
endif (OPTION_BUILD_SHARED_LIBS AND GENERATE_EXPORT_HEADERS)
#######################################################################
# Output Configuration Summary
#######################################################################
include (FeatureSummary)
message ("")
set (_descr "${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_FLUID)
message (STATUS "FLUID will be built in ${CMAKE_CURRENT_BINARY_DIR}/bin/fluid")
else ()
message (STATUS "FLUID will not be built (set FLTK_BUILD_FLUID=ON to build)")
endif ()
if (FLTK_BUILD_FLTK_OPTIONS)
message (STATUS "fltk-options will be built in ${CMAKE_CURRENT_BINARY_DIR}/bin/fltk-options")
else ()
message (STATUS "fltk-options will not be built (set FLTK_BUILD_FLTK_OPTIONS=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 ()
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 (UNIX AND NOT (APPLE AND NOT OPTION_APPLE_X11))
if (OPTION_USE_WAYLAND)
message (STATUS "Use Wayland: Yes (when available at run-time)")
else ()
message (STATUS "Use Wayland: No (therefore, X11 is used)")
endif ()
if (FLTK_USE_CAIRO)
message (STATUS "All drawing uses Cairo: Yes")
else ()
message (STATUS "All drawing uses Cairo: No")
endif ()
if (USE_PANGO)
message (STATUS "Use Pango: Yes")
else (USE_PANGO)
message (STATUS "Use Pango: No")
if (USE_XFT)
message (STATUS "Use Xft: Yes")
else ()
message (STATUS "Use Xft: No")
endif (USE_XFT)
endif (USE_PANGO)
endif (UNIX AND NOT (APPLE AND NOT OPTION_APPLE_X11))
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")
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