1# - Locate SDL library 2# This module defines 3# SDL2_LIBRARY, the name of the library to link against 4# SDL2_FOUND, if false, do not try to link to SDL 5# SDL2_INCLUDE_DIR, where to find SDL.h 6# SDL2_VERSION_STRING, human-readable string containing the version of SDL 7# 8# This module responds to the flag: 9# SDL2_BUILDING_LIBRARY 10# If this is defined, then no SDL2_main will be linked in because 11# only applications need main(). 12# Otherwise, it is assumed you are building an application and this 13# module will attempt to locate and set the proper link flags 14# as part of the returned SDL2_LIBRARY variable. 15# 16# Don't forget to include SDLmain.h and SDLmain.m your project for the 17# OS X framework based version. (Other versions link to -lSDLmain which 18# this module will try to find on your behalf.) Also for OS X, this 19# module will automatically add the -framework Cocoa on your behalf. 20# 21# 22# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration 23# and no SDL2_LIBRARY, it means CMake did not find your SDL library 24# (SDL.dll, libsdl.so, SDL.framework, etc). 25# Set SDL2_LIBRARY_TEMP to point to your SDL library, and configure again. 26# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value 27# as appropriate. These values are used to generate the final SDL2_LIBRARY 28# variable, but when these values are unset, SDL2_LIBRARY does not get created. 29# 30# 31# $SDLDIR is an environment variable that would 32# correspond to the ./configure --prefix=$SDLDIR 33# used in building SDL. 34# l.e.galup 9-20-02 35# 36# Modified by Eric Wing. 37# Added code to assist with automated building by using environmental variables 38# and providing a more controlled/consistent search behavior. 39# Added new modifications to recognize OS X frameworks and 40# additional Unix paths (FreeBSD, etc). 41# Also corrected the header search path to follow "proper" SDL guidelines. 42# Added a search for SDLmain which is needed by some platforms. 43# Added a search for threads which is needed by some platforms. 44# Added needed compile switches for MinGW. 45# 46# On OSX, this will prefer the Framework version (if found) over others. 47# People will have to manually change the cache values of 48# SDL2_LIBRARY to override this selection or set the CMake environment 49# CMAKE_INCLUDE_PATH to modify the search paths. 50# 51# Note that the header path has changed from SDL/SDL.h to just SDL.h 52# This needed to change because "proper" SDL convention 53# is #include "SDL.h", not <SDL/SDL.h>. This is done for portability 54# reasons because not all systems place things in SDL/ (see FreeBSD). 55 56#============================================================================= 57# Copyright 2003-2009 Kitware, Inc. 58# Copyright 2012 Benjamin Eikel 59# 60# Distributed under the OSI-approved BSD License (the "License"); 61# see accompanying file Copyright.txt for details. 62# 63# This software is distributed WITHOUT ANY WARRANTY; without even the 64# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 65# See the License for more information. 66#============================================================================= 67# (To distribute this file outside of CMake, substitute the full 68# License text for the above reference.) 69 70find_path(SDL2_INCLUDE_DIR SDL.h 71 HINTS 72 ENV SDL2DIR 73 PATH_SUFFIXES include/SDL2 74) 75 76# SDL-1.1 is the name used by FreeBSD ports... 77# don't confuse it for the version number. 78find_library(SDL2_LIBRARY_TEMP 79 NAMES SDL2 80 HINTS 81 ENV SDL2DIR 82 PATH_SUFFIXES lib 83) 84 85if(NOT SDL2_BUILDING_LIBRARY) 86 if(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework") 87 # Non-OS X framework versions expect you to also dynamically link to 88 # SDLmain. This is mainly for Windows and OS X. Other (Unix) platforms 89 # seem to provide SDLmain for compatibility even though they don't 90 # necessarily need it. 91 find_library(SDL2MAIN_LIBRARY 92 NAMES SDL2main 93 HINTS 94 ENV SDL2DIR 95 PATH_SUFFIXES lib 96 PATHS 97 /sw 98 /opt/local 99 /opt/csw 100 /opt 101 ) 102 endif() 103endif() 104 105# SDL may require threads on your system. 106# The Apple build may not need an explicit flag because one of the 107# frameworks may already provide it. 108# But for non-OSX systems, I will use the CMake Threads package. 109if(NOT APPLE) 110 find_package(Threads) 111endif() 112 113# MinGW needs an additional library, mwindows 114# It's total link flags should look like -lmingw32 -lSDLmain -lSDL -lmwindows 115# (Actually on second look, I think it only needs one of the m* libraries.) 116if(MINGW) 117 set(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW") 118endif() 119 120if(SDL2_LIBRARY_TEMP) 121 # For SDLmain 122 if(SDL2MAIN_LIBRARY AND NOT SDL2_BUILDING_LIBRARY) 123 list(FIND SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" _SDL2_MAIN_INDEX) 124 if(_SDL2_MAIN_INDEX EQUAL -1) 125 set(SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" ${SDL2_LIBRARY_TEMP}) 126 endif() 127 unset(_SDL2_MAIN_INDEX) 128 endif() 129 130 # For OS X, SDL uses Cocoa as a backend so it must link to Cocoa. 131 # CMake doesn't display the -framework Cocoa string in the UI even 132 # though it actually is there if I modify a pre-used variable. 133 # I think it has something to do with the CACHE STRING. 134 # So I use a temporary variable until the end so I can set the 135 # "real" variable in one-shot. 136 if(APPLE) 137 set(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa") 138 endif() 139 140 # For threads, as mentioned Apple doesn't need this. 141 # In fact, there seems to be a problem if I used the Threads package 142 # and try using this line, so I'm just skipping it entirely for OS X. 143 if(NOT APPLE) 144 set(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT}) 145 endif() 146 147 # For MinGW library 148 if(MINGW) 149 set(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP}) 150 endif() 151 152 # Set the final string here so the GUI reflects the final state. 153 set(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL Library can be found") 154 # Set the temp variable to INTERNAL so it is not seen in the CMake GUI 155 set(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "") 156endif() 157 158if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL2_version.h") 159 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL2_version.h" SDL2_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL2_MAJOR_VERSION[ \t]+[0-9]+$") 160 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL2_version.h" SDL2_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL2_MINOR_VERSION[ \t]+[0-9]+$") 161 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL2_version.h" SDL2_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL2_PATCHLEVEL[ \t]+[0-9]+$") 162 string(REGEX REPLACE "^#define[ \t]+SDL2_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MAJOR "${SDL2_VERSION_MAJOR_LINE}") 163 string(REGEX REPLACE "^#define[ \t]+SDL2_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MINOR "${SDL2_VERSION_MINOR_LINE}") 164 string(REGEX REPLACE "^#define[ \t]+SDL2_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_PATCH "${SDL2_VERSION_PATCH_LINE}") 165 set(SDL2_VERSION_STRING ${SDL2_VERSION_MAJOR}.${SDL2_VERSION_MINOR}.${SDL2_VERSION_PATCH}) 166 unset(SDL2_VERSION_MAJOR_LINE) 167 unset(SDL2_VERSION_MINOR_LINE) 168 unset(SDL2_VERSION_PATCH_LINE) 169 unset(SDL2_VERSION_MAJOR) 170 unset(SDL2_VERSION_MINOR) 171 unset(SDL2_VERSION_PATCH) 172endif() 173 174include(FindPackageHandleStandardArgs) 175 176FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 177 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR 178 VERSION_VAR SDL2_VERSION_STRING) 179