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CMake/Modules/FindFLTK.cmake
Brad King c4275592a8 Modules: Include builtin FindPackageHandleStandardArgs directly 
The FindPackageHandleStandardArgs module was originally created outside
of CMake.  It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18).  However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).

Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module.  Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.

Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line

  include(FindPackageHandleStandardArgs)

loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.

Whether this breakage can be considered a backward incompatible change
in CMake is debatable.  The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header.  Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.

This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them.  At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.

In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17).  That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy.  However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.

We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line.  Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.

The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28).  This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
2011-01-20 10:56:49 -05:00

316 lines
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CMake
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# - Find the native FLTK includes and library
#
# By default FindFLTK.cmake will search for all of the FLTK components and
# add them to the FLTK_LIBRARIES variable.
#
# You can limit the components which get placed in FLTK_LIBRARIES by
# defining one or more of the following three options:
#
# FLTK_SKIP_OPENGL, set to true to disable searching for opengl and
# the FLTK GL library
# FLTK_SKIP_FORMS, set to true to disable searching for fltk_forms
# FLTK_SKIP_IMAGES, set to true to disable searching for fltk_images
#
# FLTK_SKIP_FLUID, set to true if the fluid binary need not be present
# at build time
#
# The following variables will be defined:
# FLTK_FOUND, True if all components not skipped were found
# FLTK_INCLUDE_DIR, where to find include files
# FLTK_LIBRARIES, list of fltk libraries you should link against
# FLTK_FLUID_EXECUTABLE, where to find the Fluid tool
# FLTK_WRAP_UI, This enables the FLTK_WRAP_UI command
#
# The following cache variables are assigned but should not be used.
# See the FLTK_LIBRARIES variable instead.
#
# FLTK_BASE_LIBRARY = the full path to fltk.lib
# FLTK_GL_LIBRARY = the full path to fltk_gl.lib
# FLTK_FORMS_LIBRARY = the full path to fltk_forms.lib
# FLTK_IMAGES_LIBRARY = the full path to fltk_images.lib
#=============================================================================
# Copyright 2001-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
IF(NOT FLTK_SKIP_OPENGL)
FIND_PACKAGE(OpenGL)
ENDIF()
# Platform dependent libraries required by FLTK
IF(WIN32)
IF(NOT CYGWIN)
IF(BORLAND)
SET( FLTK_PLATFORM_DEPENDENT_LIBS import32 )
ELSE(BORLAND)
SET( FLTK_PLATFORM_DEPENDENT_LIBS wsock32 comctl32 )
ENDIF(BORLAND)
ENDIF(NOT CYGWIN)
ENDIF(WIN32)
IF(UNIX)
INCLUDE(FindX11)
FIND_LIBRARY(FLTK_MATH_LIBRARY m)
SET( FLTK_PLATFORM_DEPENDENT_LIBS ${X11_LIBRARIES} ${FLTK_MATH_LIBRARY})
ENDIF(UNIX)
IF(APPLE)
SET( FLTK_PLATFORM_DEPENDENT_LIBS "-framework Carbon -framework Cocoa -framework ApplicationServices -lz")
ENDIF(APPLE)
# If FLTK_INCLUDE_DIR is already defined we assigne its value to FLTK_DIR
IF(FLTK_INCLUDE_DIR)
SET(FLTK_DIR ${FLTK_INCLUDE_DIR})
ENDIF(FLTK_INCLUDE_DIR)
# If FLTK has been built using CMake we try to find everything directly
SET(FLTK_DIR_STRING "directory containing FLTKConfig.cmake. This is either the root of the build tree, or PREFIX/lib/fltk for an installation.")
# Search only if the location is not already known.
IF(NOT FLTK_DIR)
# Get the system search path as a list.
IF(UNIX)
STRING(REGEX MATCHALL "[^:]+" FLTK_DIR_SEARCH1 "$ENV{PATH}")
ELSE(UNIX)
STRING(REGEX REPLACE "\\\\" "/" FLTK_DIR_SEARCH1 "$ENV{PATH}")
ENDIF(UNIX)
STRING(REGEX REPLACE "/;" ";" FLTK_DIR_SEARCH2 ${FLTK_DIR_SEARCH1})
# Construct a set of paths relative to the system search path.
SET(FLTK_DIR_SEARCH "")
FOREACH(dir ${FLTK_DIR_SEARCH2})
SET(FLTK_DIR_SEARCH ${FLTK_DIR_SEARCH} "${dir}/../lib/fltk")
ENDFOREACH(dir)
#
# Look for an installation or build tree.
#
FIND_PATH(FLTK_DIR FLTKConfig.cmake
# Look for an environment variable FLTK_DIR.
$ENV{FLTK_DIR}
# Look in places relative to the system executable search path.
${FLTK_DIR_SEARCH}
# Look in standard UNIX install locations.
/usr/local/lib/fltk
/usr/lib/fltk
/usr/local/include
/usr/include
/usr/local/fltk
/usr/X11R6/include
# Read from the CMakeSetup registry entries. It is likely that
# FLTK will have been recently built.
# TODO: Is this really a good idea? I can already hear the user screaming, "But
# it worked when I configured the build LAST week!"
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild1]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild2]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild3]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild4]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild5]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild6]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild7]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild8]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild9]
[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild10]
# Help the user find it if we cannot.
DOC "The ${FLTK_DIR_STRING}"
)
ENDIF(NOT FLTK_DIR)
# Check if FLTK was built using CMake
IF(EXISTS ${FLTK_DIR}/FLTKConfig.cmake)
SET(FLTK_BUILT_WITH_CMAKE 1)
ENDIF(EXISTS ${FLTK_DIR}/FLTKConfig.cmake)
IF(FLTK_BUILT_WITH_CMAKE)
SET(FLTK_FOUND 1)
INCLUDE(${FLTK_DIR}/FLTKConfig.cmake)
# Fluid
IF(FLUID_COMMAND)
SET(FLTK_FLUID_EXECUTABLE ${FLUID_COMMAND} CACHE FILEPATH "Fluid executable")
ELSE(FLUID_COMMAND)
FIND_PROGRAM(FLTK_FLUID_EXECUTABLE fluid PATHS
${FLTK_EXECUTABLE_DIRS}
${FLTK_EXECUTABLE_DIRS}/RelWithDebInfo
${FLTK_EXECUTABLE_DIRS}/Debug
${FLTK_EXECUTABLE_DIRS}/Release
NO_SYSTEM_PATH)
ENDIF(FLUID_COMMAND)
# MARK_AS_ADVANCED(FLTK_FLUID_EXECUTABLE)
SET(FLTK_INCLUDE_DIR ${FLTK_DIR})
LINK_DIRECTORIES(${FLTK_LIBRARY_DIRS})
SET(FLTK_BASE_LIBRARY fltk)
SET(FLTK_GL_LIBRARY fltk_gl)
SET(FLTK_FORMS_LIBRARY fltk_forms)
SET(FLTK_IMAGES_LIBRARY fltk_images)
# Add the extra libraries
LOAD_CACHE(${FLTK_DIR}
READ_WITH_PREFIX
FL FLTK_USE_SYSTEM_JPEG
FL FLTK_USE_SYSTEM_PNG
FL FLTK_USE_SYSTEM_ZLIB
)
SET(FLTK_IMAGES_LIBS "")
IF(FLFLTK_USE_SYSTEM_JPEG)
SET(FLTK_IMAGES_LIBS ${FLTK_IMAGES_LIBS} fltk_jpeg)
ENDIF(FLFLTK_USE_SYSTEM_JPEG)
IF(FLFLTK_USE_SYSTEM_PNG)
SET(FLTK_IMAGES_LIBS ${FLTK_IMAGES_LIBS} fltk_png)
ENDIF(FLFLTK_USE_SYSTEM_PNG)
IF(FLFLTK_USE_SYSTEM_ZLIB)
SET(FLTK_IMAGES_LIBS ${FLTK_IMAGES_LIBS} fltk_zlib)
ENDIF(FLFLTK_USE_SYSTEM_ZLIB)
SET(FLTK_IMAGES_LIBS "${FLTK_IMAGES_LIBS}" CACHE INTERNAL
"Extra libraries for fltk_images library.")
ELSE(FLTK_BUILT_WITH_CMAKE)
# if FLTK was not built using CMake
# Find fluid executable.
FIND_PROGRAM(FLTK_FLUID_EXECUTABLE fluid ${FLTK_INCLUDE_DIR}/fluid)
# Use location of fluid to help find everything else.
SET(FLTK_INCLUDE_SEARCH_PATH "")
SET(FLTK_LIBRARY_SEARCH_PATH "")
IF(FLTK_FLUID_EXECUTABLE)
GET_FILENAME_COMPONENT(FLTK_BIN_DIR "${FLTK_FLUID_EXECUTABLE}" PATH)
SET(FLTK_INCLUDE_SEARCH_PATH ${FLTK_INCLUDE_SEARCH_PATH}
${FLTK_BIN_DIR}/../include ${FLTK_BIN_DIR}/..)
SET(FLTK_LIBRARY_SEARCH_PATH ${FLTK_LIBRARY_SEARCH_PATH}
${FLTK_BIN_DIR}/../lib)
SET(FLTK_WRAP_UI 1)
ENDIF(FLTK_FLUID_EXECUTABLE)
#
# Try to find FLTK include dir using fltk-config
#
IF(UNIX)
# Use fltk-config to generate a list of possible include directories
FIND_PROGRAM(FLTK_CONFIG_SCRIPT fltk-config PATHS ${FLTK_BIN_DIR})
IF(FLTK_CONFIG_SCRIPT)
IF(NOT FLTK_INCLUDE_DIR)
EXEC_PROGRAM(${FLTK_CONFIG_SCRIPT} ARGS --cxxflags OUTPUT_VARIABLE FLTK_CXXFLAGS)
IF(FLTK_CXXFLAGS)
STRING(REGEX MATCHALL "-I[^ ]*" _fltk_temp_dirs ${FLTK_CXXFLAGS})
STRING(REPLACE "-I" "" _fltk_temp_dirs "${_fltk_temp_dirs}")
FOREACH(_dir ${_fltk_temp_dirs})
STRING(STRIP ${_dir} _output)
LIST(APPEND _FLTK_POSSIBLE_INCLUDE_DIRS ${_output})
ENDFOREACH()
ENDIF(FLTK_CXXFLAGS)
ENDIF()
ENDIF()
ENDIF()
SET(FLTK_INCLUDE_SEARCH_PATH ${FLTK_INCLUDE_SEARCH_PATH}
/usr/local/fltk
/usr/X11R6/include
${_FLTK_POSSIBLE_INCLUDE_DIRS}
)
FIND_PATH(FLTK_INCLUDE_DIR
NAMES FL/Fl.h FL/Fl.H # fltk 1.1.9 has Fl.H (#8376)
PATHS ${FLTK_INCLUDE_SEARCH_PATH})
#
# Try to find FLTK library
IF(UNIX)
IF(FLTK_CONFIG_SCRIPT)
EXEC_PROGRAM(${FLTK_CONFIG_SCRIPT} ARGS --libs OUTPUT_VARIABLE _FLTK_POSSIBLE_LIBS)
IF(_FLTK_POSSIBLE_LIBS)
GET_FILENAME_COMPONENT(_FLTK_POSSIBLE_LIBRARY_DIR ${_FLTK_POSSIBLE_LIBS} PATH)
ENDIF()
ENDIF()
ENDIF()
SET(FLTK_LIBRARY_SEARCH_PATH ${FLTK_LIBRARY_SEARCH_PATH}
/usr/local/fltk/lib
/usr/X11R6/lib
${FLTK_INCLUDE_DIR}/lib
${_FLTK_POSSIBLE_LIBRARY_DIR}
)
FIND_LIBRARY(FLTK_BASE_LIBRARY NAMES fltk fltkd
PATHS ${FLTK_LIBRARY_SEARCH_PATH})
FIND_LIBRARY(FLTK_GL_LIBRARY NAMES fltkgl fltkgld fltk_gl
PATHS ${FLTK_LIBRARY_SEARCH_PATH})
FIND_LIBRARY(FLTK_FORMS_LIBRARY NAMES fltkforms fltkformsd fltk_forms
PATHS ${FLTK_LIBRARY_SEARCH_PATH})
FIND_LIBRARY(FLTK_IMAGES_LIBRARY NAMES fltkimages fltkimagesd fltk_images
PATHS ${FLTK_LIBRARY_SEARCH_PATH})
# Find the extra libraries needed for the fltk_images library.
IF(UNIX)
IF(FLTK_CONFIG_SCRIPT)
EXEC_PROGRAM(${FLTK_CONFIG_SCRIPT} ARGS --use-images --ldflags
OUTPUT_VARIABLE FLTK_IMAGES_LDFLAGS)
SET(FLTK_LIBS_EXTRACT_REGEX ".*-lfltk_images (.*) -lfltk.*")
IF("${FLTK_IMAGES_LDFLAGS}" MATCHES "${FLTK_LIBS_EXTRACT_REGEX}")
STRING(REGEX REPLACE "${FLTK_LIBS_EXTRACT_REGEX}" "\\1"
FLTK_IMAGES_LIBS "${FLTK_IMAGES_LDFLAGS}")
STRING(REGEX REPLACE " +" ";" FLTK_IMAGES_LIBS "${FLTK_IMAGES_LIBS}")
# The EXEC_PROGRAM will not be inherited into subdirectories from
# the file that originally included this module. Save the answer.
SET(FLTK_IMAGES_LIBS "${FLTK_IMAGES_LIBS}" CACHE INTERNAL
"Extra libraries for fltk_images library.")
ENDIF("${FLTK_IMAGES_LDFLAGS}" MATCHES "${FLTK_LIBS_EXTRACT_REGEX}")
ENDIF(FLTK_CONFIG_SCRIPT)
ENDIF(UNIX)
ENDIF(FLTK_BUILT_WITH_CMAKE)
# Append all of the required libraries together (by default, everything)
SET(FLTK_LIBRARIES)
IF(NOT FLTK_SKIP_IMAGES)
LIST(APPEND FLTK_LIBRARIES ${FLTK_IMAGES_LIBRARY})
ENDIF()
IF(NOT FLTK_SKIP_FORMS)
LIST(APPEND FLTK_LIBRARIES ${FLTK_FORMS_LIBRARY})
ENDIF()
IF(NOT FLTK_SKIP_OPENGL)
LIST(APPEND FLTK_LIBRARIES ${FLTK_GL_LIBRARY} ${OPENGL_gl_LIBRARY})
LIST(APPEND FLTK_INCLUDE_DIR ${OPENGL_INCLUDE_DIR})
LIST(REMOVE_DUPLICATES FLTK_INCLUDE_DIR)
ENDIF()
LIST(APPEND FLTK_LIBRARIES ${FLTK_BASE_LIBRARY})
INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
IF(FLTK_SKIP_FLUID)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLTK DEFAULT_MSG FLTK_LIBRARIES FLTK_INCLUDE_DIR)
ELSE()
FIND_PACKAGE_HANDLE_STANDARD_ARGS(FLTK DEFAULT_MSG FLTK_LIBRARIES FLTK_INCLUDE_DIR FLTK_FLUID_EXECUTABLE)
ENDIF()
IF(FLTK_FOUND)
IF(APPLE)
SET(FLTK_LIBRARIES ${FLTK_PLATFORM_DEPENDENT_LIBS} ${FLTK_LIBRARIES})
ELSE(APPLE)
SET(FLTK_LIBRARIES ${FLTK_LIBRARIES} ${FLTK_PLATFORM_DEPENDENT_LIBS})
ENDIF(APPLE)
# The following deprecated settings are for compatibility with CMake 1.4
SET (HAS_FLTK ${FLTK_FOUND})
SET (FLTK_INCLUDE_PATH ${FLTK_INCLUDE_DIR})
SET (FLTK_FLUID_EXE ${FLTK_FLUID_EXECUTABLE})
SET (FLTK_LIBRARY ${FLTK_LIBRARIES})
ENDIF(FLTK_FOUND)
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