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fltk/CMake/resources.cmake
Albrecht Schlosser bc63ea7629 CMake: improve linking OpenGL3 example programs (#959) 
- Remove find_library(LIB_GLEW ...) from 'resources.cmake'

- Use the variable FLTK_GLEW_DIR to "find" a user supplied GLEW library
  for OpenGL3 example programs (examples/OpenGL3*.cxx).
  Both static and shared libs (DLLs) are supported, but the static
  library is preferred to avoid DLL dependencies.

- Define preprocessor macro 'GLEW_STATIC' by CMake compile definitions
  if and only if the static glew library (glew32s) was found and linked.
  The previous code defined 'GLEW_STATIC' unconditionally in the source
  code which led to undefined references if a shared lib (DLL) was used.
2024-05-13 15:19:27 +02:00

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#
# Resource definitions 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
#
#######################################################################
# check for headers, libraries and functions
#######################################################################
# If CMAKE_REQUIRED_QUIET is 1 (default) the search is mostly quiet,
# if it is 0 (or not defined) check_include_files() is more verbose
# and the result of the search is logged with fl_debug_var().
# This is useful for debugging.
set(CMAKE_REQUIRED_QUIET 1)
include(CheckIncludeFiles)
macro(fl_find_header VAR HEADER)
check_include_files("${HEADER}" ${VAR})
if(NOT CMAKE_REQUIRED_QUIET)
fl_debug_var(${VAR})
endif(NOT CMAKE_REQUIRED_QUIET)
endmacro(fl_find_header)
#######################################################################
# Include FindPkgConfig for later use of pkg-config
#######################################################################
include(FindPkgConfig)
# fl_debug_var(PKG_CONFIG_FOUND)
# fl_debug_var(PKG_CONFIG_EXECUTABLE)
# fl_debug_var(PKG_CONFIG_VERSION_STRING)
#######################################################################
# Find header files...
#######################################################################
if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "FreeBSD")
list(APPEND CMAKE_REQUIRED_INCLUDES /usr/local/include)
endif(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "FreeBSD")
fl_find_header(HAVE_ALSA_ASOUNDLIB_H alsa/asoundlib.h)
fl_find_header(HAVE_DLFCN_H dlfcn.h)
fl_find_header(HAVE_GL_GLU_H GL/glu.h)
fl_find_header(HAVE_LOCALE_H locale.h)
fl_find_header(HAVE_OPENGL_GLU_H OpenGL/glu.h)
fl_find_header(HAVE_STDIO_H stdio.h)
fl_find_header(HAVE_STRINGS_H strings.h)
fl_find_header(HAVE_SYS_SELECT_H sys/select.h)
fl_find_header(HAVE_SYS_STDTYPES_H sys/stdtypes.h)
fl_find_header(HAVE_X11_XREGION_H "X11/Xlib.h;X11/Xregion.h")
if(WIN32 AND NOT CYGWIN)
# we don't use pthreads on Windows (except for Cygwin, see options.cmake)
set(HAVE_PTHREAD_H 0)
else()
fl_find_header(HAVE_PTHREAD_H pthread.h)
endif(WIN32 AND NOT CYGWIN)
# Do we have PTHREAD_MUTEX_RECURSIVE ?
if(HAVE_PTHREAD_H)
try_compile(HAVE_PTHREAD_MUTEX_RECURSIVE
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/CMake/pthread_mutex_recursive.c
)
else()
set(HAVE_PTHREAD_MUTEX_RECURSIVE 0)
endif()
# Special case for Microsoft Visual Studio generator (MSVC):
#
# The header files <GL/glu.h> and <locale.h> are located in the SDK's
# for Visual Studio. If CMake is invoked from a desktop icon or the Windows
# menu it doesn't have the correct paths to find these header files.
# The CMake folks recommend not to search for these files at all, because
# they must always be there, but we do anyway.
# If we don't find them we issue a warning and continue anyway.
#
# Note: these cache variables can only be seen in "advanced" mode.
if(MSVC)
if(NOT HAVE_GL_GLU_H)
message(STATUS "Info: Header file GL/glu.h was not found. Continuing...")
set(HAVE_GL_GLU_H 1)
endif(NOT HAVE_GL_GLU_H)
if(NOT HAVE_LOCALE_H)
message(STATUS "Info: Header file locale.h was not found. Continuing...")
set(HAVE_LOCALE_H 1)
endif(NOT HAVE_LOCALE_H)
endif(MSVC)
# Simulate the behavior of autoconf macro AC_HEADER_DIRENT, see:
# https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Particular-Headers.html
# "Check for the following header files. For the first one that is found
# and defines 'DIR', define the listed C preprocessor macro ..."
#
# Note: we don't check if it really defines 'DIR', but we stop processing
# once we found the first suitable header file.
fl_find_header(HAVE_DIRENT_H dirent.h)
if(NOT HAVE_DIRENT_H)
fl_find_header(HAVE_SYS_NDIR_H sys/ndir.h)
if(NOT HAVE_SYS_NDIR_H)
fl_find_header(HAVE_SYS_DIR_H sys/dir.h)
if(NOT HAVE_SYS_DIR_H)
fl_find_header(HAVE_NDIR_H ndir.h)
endif(NOT HAVE_SYS_DIR_H)
endif(NOT HAVE_SYS_NDIR_H)
endif(NOT HAVE_DIRENT_H)
#----------------------------------------------------------------------
# The following code is used to find the include path for freetype
# headers to be able to #include <ft2build.h> in Xft.h.
# where to find freetype headers
find_path(FREETYPE_PATH freetype.h PATH_SUFFIXES freetype2)
find_path(FREETYPE_PATH freetype/freetype.h PATH_SUFFIXES freetype2)
if(FREETYPE_PATH AND ((NOT APPLE) OR FLTK_BACKEND_X11))
list(APPEND FLTK_BUILD_INCLUDE_DIRECTORIES ${FREETYPE_PATH})
endif(FREETYPE_PATH AND ((NOT APPLE) OR FLTK_BACKEND_X11))
mark_as_advanced(FREETYPE_PATH)
#######################################################################
# libraries
find_library(LIB_dl dl)
if((NOT APPLE) OR FLTK_BACKEND_X11)
find_library(LIB_fontconfig fontconfig)
endif((NOT APPLE) OR FLTK_BACKEND_X11)
find_library(LIB_freetype freetype)
find_library(LIB_GL GL)
find_library(LIB_MesaGL MesaGL)
find_library(LIB_jpeg jpeg)
find_library(LIB_png png)
find_library(LIB_zlib z)
find_library(LIB_m m)
mark_as_advanced(LIB_dl LIB_fontconfig LIB_freetype)
mark_as_advanced(LIB_GL LIB_MesaGL)
mark_as_advanced(LIB_jpeg LIB_png LIB_zlib)
mark_as_advanced(LIB_m)
#######################################################################
# functions
include(CheckFunctionExists)
# Save CMAKE_REQUIRED_LIBRARIES
# Note: CMAKE_REQUIRED_LIBRARIES must be set for each search and
# reset after the search to avoid to influence subsequent searches.
# The original value is restored after all searches.
if(DEFINED CMAKE_REQUIRED_LIBRARIES)
set(SAVED_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
else()
unset(SAVED_REQUIRED_LIBRARIES)
endif()
set(CMAKE_REQUIRED_LIBRARIES)
if(HAVE_DLFCN_H)
set(HAVE_DLFCN_H 1)
endif(HAVE_DLFCN_H)
set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_DL_LIBS})
check_function_exists(dlsym HAVE_DLSYM)
set(CMAKE_REQUIRED_LIBRARIES)
check_function_exists(localeconv HAVE_LOCALECONV)
if(LIB_png)
set(CMAKE_REQUIRED_LIBRARIES ${LIB_png})
check_function_exists(png_get_valid HAVE_PNG_GET_VALID)
check_function_exists(png_set_tRNS_to_alpha HAVE_PNG_SET_TRNS_TO_ALPHA)
set(CMAKE_REQUIRED_LIBRARIES)
endif(LIB_png)
check_function_exists(scandir HAVE_SCANDIR)
check_function_exists(snprintf HAVE_SNPRINTF)
# not really true but we convert strcasecmp calls to _stricmp calls in flstring.h
if(MSVC)
set(HAVE_STRCASECMP 1)
endif(MSVC)
check_function_exists(strcasecmp HAVE_STRCASECMP)
check_function_exists(strlcat HAVE_STRLCAT)
check_function_exists(strlcpy HAVE_STRLCPY)
check_function_exists(vsnprintf HAVE_VSNPRINTF)
check_function_exists(setenv HAVE_SETENV)
# Windows doesn't require '-lm' for trunc(), other platforms do
if(LIB_m AND NOT WIN32)
set(CMAKE_REQUIRED_LIBRARIES ${LIB_m})
endif()
check_function_exists(trunc HAVE_TRUNC)
set(CMAKE_REQUIRED_LIBRARIES)
if(HAVE_SCANDIR AND NOT HAVE_SCANDIR_POSIX)
set(MSG "POSIX compatible scandir")
message(STATUS "Looking for ${MSG}")
try_compile(V
${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/CMake/posixScandir.cxx
)
if(V)
message(STATUS "${MSG} - found")
set(HAVE_SCANDIR_POSIX 1 CACHE INTERNAL "")
else()
message(STATUS "${MSG} - not found")
set(HAVE_SCANDIR_POSIX HAVE_SCANDIR_POSIX-NOTFOUND)
endif(V)
endif(HAVE_SCANDIR AND NOT HAVE_SCANDIR_POSIX)
mark_as_advanced(HAVE_SCANDIR_POSIX)
# restore CMAKE_REQUIRED_LIBRARIES
if(DEFINED SAVED_REQUIRED_LIBRARIES)
set(CMAKE_REQUIRED_LIBRARIES ${SAVED_REQUIRED_LIBRARIES})
unset(SAVED_REQUIRED_LIBRARIES)
else()
unset(CMAKE_REQUIRED_LIBRARIES)
endif()
#######################################################################
# packages
# Doxygen: necessary for HTML and PDF docs
find_package(Doxygen)
# LaTex: necessary for PDF docs (note: FindLATEX doesn't return LATEX_FOUND)
# Note: we only check existence of `latex' (LATEX_COMPILER), hence
# building the pdf docs may still fail because of other missing tools.
set(LATEX_FOUND)
if(DOXYGEN_FOUND)
find_package(LATEX)
if(LATEX_COMPILER AND NOT LATEX_FOUND)
set(LATEX_FOUND YES)
endif(LATEX_COMPILER AND NOT LATEX_FOUND)
endif(DOXYGEN_FOUND)
# message("Doxygen found : ${DOXYGEN_FOUND}")
# message("LaTex found : ${LATEX_FOUND}")
# message("LaTex Compiler : ${LATEX_COMPILER}")
# Cleanup: unset local variables
unset(CMAKE_REQUIRED_QUIET)
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