1 # - Locate SDL2 library (modified from CMake's FindSDL.cmake)
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 SDL2
8 # This module responds to the the flag:
9 # SDL2_BUILDING_LIBRARY
10 # If this is defined, then no SDL_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 the proper link flags
14 # as part of the returned SDL2_LIBRARY variable.
16 # Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
17 # and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
18 # (SDL2.dll, libsdl2.so, SDL2.framework, etc).
19 # Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
20 # Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
21 # as appropriate. These values are used to generate the final SDL2_LIBRARY
22 # variable, but when these values are unset, SDL2_LIBRARY does not get created.
25 # $SDL2DIR is an environment variable that would
26 # correspond to the ./configure --prefix=$SDL2DIR
27 # used in building SDL.
30 #=============================================================================
31 # Copyright 2014 Justin Jacobs
33 # Distributed under the OSI-approved BSD License (the "License");
34 # see accompanying file Copyright.txt for details.
36 # This software is distributed WITHOUT ANY WARRANTY; without even the
37 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
38 # See the License for more information.
39 #=============================================================================
41 find_path(SDL2_INCLUDE_DIR SDL.h
45 PATH_SUFFIXES include/SDL2 include
48 find_library(SDL2_LIBRARY_TEMP
56 if(NOT SDL2_BUILDING_LIBRARY)
57 if(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
58 # Non-OS X framework versions expect you to also dynamically link to
59 # SDLmain. This is mainly for Windows and OS X. Other (Unix) platforms
60 # seem to provide SDLmain for compatibility even though they don't
61 # necessarily need it.
62 find_library(SDL2MAIN_LIBRARY
77 # SDL2 may require threads on your system.
78 # The Apple build may not need an explicit flag because one of the
79 # frameworks may already provide it.
80 # But for non-OSX systems, I will use the CMake Threads package.
85 # MinGW needs an additional library, mwindows
86 # It's total link flags should look like -lmingw32 -lSDLmain -lSDL -lmwindows
87 # (Actually on second look, I think it only needs one of the m* libraries.)
89 set(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
94 if(SDL2MAIN_LIBRARY AND NOT SDL2_BUILDING_LIBRARY)
95 list(FIND SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" _SDL2_MAIN_INDEX)
96 if(_SDL2_MAIN_INDEX EQUAL -1)
97 set(SDL2_LIBRARY_TEMP "${SDL2MAIN_LIBRARY}" ${SDL2_LIBRARY_TEMP})
99 unset(_SDL2_MAIN_INDEX)
102 # For OS X, SDL uses Cocoa as a backend so it must link to Cocoa.
103 # CMake doesn't display the -framework Cocoa string in the UI even
104 # though it actually is there if I modify a pre-used variable.
105 # I think it has something to do with the CACHE STRING.
106 # So I use a temporary variable until the end so I can set the
107 # "real" variable in one-shot.
109 set(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
112 # For threads, as mentioned Apple doesn't need this.
113 # In fact, there seems to be a problem if I used the Threads package
114 # and try using this line, so I'm just skipping it entirely for OS X.
116 set(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
121 set(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
124 # Set the final string here so the GUI reflects the final state.
125 set(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
126 # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
127 set(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
130 if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL_version.h")
131 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+[0-9]+$")
132 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_MINOR_VERSION[ \t]+[0-9]+$")
133 file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_PATCHLEVEL[ \t]+[0-9]+$")
134 string(REGEX REPLACE "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MAJOR "${SDL2_VERSION_MAJOR_LINE}")
135 string(REGEX REPLACE "^#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MINOR "${SDL2_VERSION_MINOR_LINE}")
136 string(REGEX REPLACE "^#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_PATCH "${SDL2_VERSION_PATCH_LINE}")
137 set(SDL2_VERSION_STRING ${SDL2_VERSION_MAJOR}.${SDL2_VERSION_MINOR}.${SDL2_VERSION_PATCH})
138 unset(SDL2_VERSION_MAJOR_LINE)
139 unset(SDL2_VERSION_MINOR_LINE)
140 unset(SDL2_VERSION_PATCH_LINE)
141 unset(SDL2_VERSION_MAJOR)
142 unset(SDL2_VERSION_MINOR)
143 unset(SDL2_VERSION_PATCH)
146 include(FindPackageHandleStandardArgs)
148 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2
149 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR
150 VERSION_VAR SDL2_VERSION_STRING)