Gobligine/cmake/modules/FindSDL2.cmake
2020-05-02 07:24:10 +02:00

94 lines
3.4 KiB
CMake

# - Locate SDL library
find_path(SDL2_INCLUDE_DIR SDL.h
HINTS
ENV SDLDIR
PATH_SUFFIXES include/SDL2 include
)
find_library(SDL2_LIBRARY_TEMP
NAMES SDL2
HINTS
ENV SDLDIR
PATH_SUFFIXES lib
)
find_library(SDL2main_LIBRARY
NAMES SDL2main
HINTS
ENV SDLDIR
PATH_SUFFIXES lib
)
# SDL 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()
# MinGW needs an additional library, mwindows
# It's total link flags should look like -lmingw32 -lSDLmain -lSDL -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()
if(SDL2_LIBRARY_TEMP)
# For OS X, SDL 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()
# 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()
# For MinGW library
if(MINGW)
set(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
endif()
# Set the final string here so the GUI reflects the final state.
set(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL Library can be found")
# Set the temp variable to INTERNAL so it is not seen in the CMake GUI
set(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
endif()
if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL_version.h")
file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+[0-9]+$")
file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_MINOR_VERSION[ \t]+[0-9]+$")
file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_PATCHLEVEL[ \t]+[0-9]+$")
string(REGEX REPLACE "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_VERSION_MAJOR "${SDL_VERSION_MAJOR_LINE}")
string(REGEX REPLACE "^#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL_VERSION_MINOR "${SDL_VERSION_MINOR_LINE}")
string(REGEX REPLACE "^#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL_VERSION_PATCH "${SDL_VERSION_PATCH_LINE}")
set(SDL_VERSION_STRING ${SDL_VERSION_MAJOR}.${SDL_VERSION_MINOR}.${SDL_VERSION_PATCH})
unset(SDL_VERSION_MAJOR_LINE)
unset(SDL_VERSION_MINOR_LINE)
unset(SDL_VERSION_PATCH_LINE)
unset(SDL_VERSION_MAJOR)
unset(SDL_VERSION_MINOR)
unset(SDL_VERSION_PATCH)
set(SDL2_FOUND TRUE)
endif()
if (SDL2_FOUND)
if (NOT SDL2_FIND_QUIETLY)
MESSAGE( STATUS "sdl2 found: includes in ${SDL2_INCLUDE_DIR}, library in ${SDL2_LIBRARY}")
endif (NOT SDL2_FIND_QUIETLY)
else (THEORA_FOUND)
if (SDL2_FIND_REQUIRED)
MESSAGE( FATAL_ERROR "sdl2 not found")
endif (SDL2_FIND_REQUIRED)
endif (SDL2_FOUND)
MARK_AS_ADVANCED(SDL2_INCLUDE_DIR SDL2_LIBRARY SDL2main_LIBRARY)