suyu/externals/cmake-modules/FindSDL2.cmake

# This module defines
# SDL2_LIBRARY, the name of the library to link against
# SDL2_FOUND, if false, do not try to link to SDL2
# SDL2_INCLUDE_DIR, where to find SDL.h
#
# This module responds to the the flag:
# SDL2_BUILDING_LIBRARY
# If this is defined, then no SDL2main will be linked in because
# only applications need main().
# Otherwise, it is assumed you are building an application and this
# module will attempt to locate and set the the proper link flags
# as part of the returned SDL2_LIBRARY variable.
#
# Don't forget to include SDLmain.h and SDLmain.m your project for the
# OS X framework based version. (Other versions link to -lSDL2main which
# this module will try to find on your behalf.) Also for OS X, this
# module will automatically add the -framework Cocoa on your behalf.
#
#
# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
# (SDL2.dll, libsdl2.so, SDL2.framework, etc).
# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
# as appropriate. These values are used to generate the final SDL2_LIBRARY
# variable, but when these values are unset, SDL2_LIBRARY does not get created.
#
#
# $SDL2DIR is an environment variable that would
# correspond to the ./configure --prefix=$SDL2DIR
# used in building SDL2.
# l.e.galup  9-20-02
#
# Modified by Eric Wing.
# Added code to assist with automated building by using environmental variables
# and providing a more controlled/consistent search behavior.
# Added new modifications to recognize OS X frameworks and
# additional Unix paths (FreeBSD, etc).
# Also corrected the header search path to follow "proper" SDL guidelines.
# Added a search for SDL2main which is needed by some platforms.
# Added a search for threads which is needed by some platforms.
# Added needed compile switches for MinGW.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL2_LIBRARY to override this selection or set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
#
# Note that the header path has changed from SDL2/SDL.h to just SDL.h
# This needed to change because "proper" SDL convention
# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
# reasons because not all systems place things in SDL2/ (see FreeBSD).

#=============================================================================
# Copyright 2003-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License").
#
# 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.
#=============================================================================
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2016 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# 
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# 
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
#   nor the names of their contributors may be used to endorse or promote
#   products derived from this software without specific prior written
#   permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# 
# ------------------------------------------------------------------------------
# 
# The above copyright and license notice applies to distributions of
# CMake in source and binary form.  Some source files contain additional
# notices of original copyright by their contributors; see each source
# for details.  Third-party software packages supplied with CMake under
# compatible licenses provide their own copyright notices documented in
# corresponding subdirectories.
# 
# ------------------------------------------------------------------------------
# 
# CMake was initially developed by Kitware with the following sponsorship:
# 
#  * National Library of Medicine at the National Institutes of Health
#    as part of the Insight Segmentation and Registration Toolkit (ITK).
# 
#  * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
#    Visualization Initiative.
# 
#  * National Alliance for Medical Image Computing (NAMIC) is funded by the
#    National Institutes of Health through the NIH Roadmap for Medical Research,
#    Grant U54 EB005149.
# 
#  * Kitware, Inc.
#

message("<FindSDL2.cmake>")

SET(SDL2_SEARCH_PATHS
    ~/Library/Frameworks
    /Library/Frameworks
    /usr/local
    /usr
    /sw # Fink
    /opt/local # DarwinPorts
    /opt/csw # Blastwave
    /opt
    ${SDL2_PATH}
)

FIND_LIBRARY(SDL2_LIBRARY_TEMP
    NAMES SDL2
    HINTS
    $ENV{SDL2DIR}
    PATH_SUFFIXES lib64 lib
    PATHS ${SDL2_SEARCH_PATHS}
)

IF(SDL2_LIBRARY_TEMP)
    FIND_PATH(SDL2_INCLUDE_DIR SDL.h
        HINTS
        $ENV{SDL2DIR}
        PATH_SUFFIXES include/SDL2 include
        PATHS ${SDL2_SEARCH_PATHS}
    )

    IF(NOT SDL2_BUILDING_LIBRARY)
        IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
            # Non-OS X framework versions expect you to also dynamically link to
            # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
            # seem to provide SDL2main for compatibility even though they don't
            # necessarily need it.
            FIND_LIBRARY(SDL2MAIN_LIBRARY
                NAMES SDL2main
                HINTS
                $ENV{SDL2DIR}
                PATH_SUFFIXES lib64 lib
                PATHS ${SDL2_SEARCH_PATHS}
            )
        ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
    ENDIF(NOT SDL2_BUILDING_LIBRARY)

    # SDL2 may require threads on your system.
    # The Apple build may not need an explicit flag because one of the
    # frameworks may already provide it.
    # But for non-OSX systems, I will use the CMake Threads package.
    IF(NOT APPLE)
        FIND_PACKAGE(Threads)
    ENDIF(NOT APPLE)

    # MinGW needs an additional library, mwindows
    # It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
    # (Actually on second look, I think it only needs one of the m* libraries.)
    IF(MINGW)
        SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
    ENDIF(MINGW)

    # For SDL2main
    IF(NOT SDL2_BUILDING_LIBRARY)
        IF(SDL2MAIN_LIBRARY)
            SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
        ENDIF(SDL2MAIN_LIBRARY)
    ENDIF(NOT SDL2_BUILDING_LIBRARY)

    # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
    # CMake doesn't display the -framework Cocoa string in the UI even
    # though it actually is there if I modify a pre-used variable.
    # I think it has something to do with the CACHE STRING.
    # So I use a temporary variable until the end so I can set the
    # "real" variable in one-shot.
    IF(APPLE)
        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
    ENDIF(APPLE)

    # For threads, as mentioned Apple doesn't need this.
    # In fact, there seems to be a problem if I used the Threads package
    # and try using this line, so I'm just skipping it entirely for OS X.
    IF(NOT APPLE)
        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
    ENDIF(NOT APPLE)

    # For MinGW library
    IF(MINGW)
        SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
    ENDIF(MINGW)

    # Set the final string here so the GUI reflects the final state.
    SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")

    # Unset the temp variable to INTERNAL so it is not seen in the CMake GUI
    UNSET(SDL2_LIBRARY_TEMP)
ENDIF(SDL2_LIBRARY_TEMP)

message("</FindSDL2.cmake>")

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)