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support static link of SDL2 and pkg-config #9

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support static link of SDL2 and pkg-config #9

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63 changes: 61 additions & 2 deletions FindSDL2.cmake
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Original file line number Diff line number Diff line change
@@ -1,9 +1,22 @@

# 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
#
# If you have pkg-config, these extra variables are also defined:
# SDL2_DEFINITIONS, extra CFLAGS
# SDL2_EXTRA_LIBS, extra link libs
# SDL2_LINKER_FLAGS, extra link flags
#
# The latter two are automatically added to SDL2_LIBRARY
#
# To use them, add code such as:
#
# # SET(SDL2_STATIC ON) # if you want to link SDL2 statically
# FIND_PACKAGE(SDL2 REQUIRED)
# ADD_DEFINITIONS(${SDL2_DEFINITIONS})
# TARGET_LINK_LIBRARIES(your-executable-target ${SDL2_LIBRARY} ...)
#
# This module responds to the the flag:
# SDL2_BUILDING_LIBRARY
# If this is defined, then no SDL2main will be linked in because
Expand All @@ -12,6 +25,8 @@
# module will attempt to locate and set the the proper link flags
# as part of the returned SDL2_LIBRARY variable.
#
# If you want to link SDL2 statically, set SDL2_STATIC to ON.
#
# 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
Expand Down Expand Up @@ -47,7 +62,7 @@
# 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
# Note that the header path has changed from SDL3/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).
Expand Down Expand Up @@ -86,6 +101,16 @@ FIND_PATH(SDL2_INCLUDE_DIR SDL.h
PATHS ${SDL2_SEARCH_PATHS}
)

SET(CURRENT_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})

IF(SDL2_STATIC)
IF(WIN32)
SET(CMAKE_FIND_LIBRARY_SUFFIXES .lib .a)
ELSE(WIN32)
SET(CMAKE_FIND_LIBRARY_SUFFIXES .a)
ENDIF(WIN32)
ENDIF(SDL2_STATIC)

FIND_LIBRARY(SDL2_LIBRARY_TEMP
NAMES SDL2
HINTS
Expand All @@ -110,6 +135,9 @@ IF(NOT SDL2_BUILDING_LIBRARY)
ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
ENDIF(NOT SDL2_BUILDING_LIBRARY)

SET(CMAKE_FIND_LIBRARY_SUFFIXES ${CURRENT_FIND_LIBRARY_SUFFIXES})
UNSET(CURRENT_FIND_LIBRARY_SUFFIXES)

# 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.
Expand Down Expand Up @@ -154,6 +182,37 @@ IF(SDL2_LIBRARY_TEMP)
SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
ENDIF(MINGW)

# Add some stuff from pkg-config, if available
IF(NOT PKG_CONFIG_EXECUTABLE)
FIND_PACKAGE(PkgConfig QUIET)
ENDIF(NOT PKG_CONFIG_EXECUTABLE)

IF(PKG_CONFIG_EXECUTABLE)
# get any definitions
EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --cflags-only-other sdl2 OUTPUT_VARIABLE SDL2_DEFINITIONS)

SET(SDL2_DEFINITIONS ${SDL2_DEFINITIONS} CACHE STRING "Extra CFLAGS for SDL2 from pkg-config")

# get any extra stuff needed for linking
IF(NOT SDL2_STATIC)
EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --libs-only-other sdl2 OUTPUT_VARIABLE SDL2_LINKER_FLAGS_RAW OUTPUT_STRIP_TRAILING_WHITESPACE)

EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --libs-only-l sdl2 OUTPUT_VARIABLE SDL2_EXTRA_LIBS_RAW OUTPUT_STRIP_TRAILING_WHITESPACE)
ELSE(NOT SDL2_STATIC)
EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --static --libs-only-other sdl2 OUTPUT_VARIABLE SDL2_LINKER_FLAGS_RAW OUTPUT_STRIP_TRAILING_WHITESPACE)
EXECUTE_PROCESS(COMMAND ${PKG_CONFIG_EXECUTABLE} --static --libs-only-l sdl2 OUTPUT_VARIABLE SDL2_EXTRA_LIBS_RAW OUTPUT_STRIP_TRAILING_WHITESPACE)
ENDIF(NOT SDL2_STATIC)

STRING(REGEX REPLACE "[^ ]+SDL2[^ ]*" "" SDL2_EXTRA_LIBS_RAW2 "${SDL2_EXTRA_LIBS_RAW}")
STRING(REGEX REPLACE " +" ";" SDL2_EXTRA_LIBS "${SDL2_EXTRA_LIBS_RAW2}")
STRING(REGEX REPLACE " +" ";" SDL2_LINKER_FLAGS "${SDL2_LINKER_FLAGS_RAW}")

SET(SDL2_LINKER_FLAGS ${SDL2_LINKER_FLAGS} CACHE STRING "Linker flags for linking SDL2")
SET(SDL2_EXTRA_LIBS ${SDL2_EXTRA_LIBS} CACHE STRING "Extra libraries for linking SDL2")

SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${SDL2_EXTRA_LIBS} ${SDL2_LINKER_FLAGS})
ENDIF(PKG_CONFIG_EXECUTABLE)

# 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")
# Set the temp variable to INTERNAL so it is not seen in the CMake GUI
Expand Down
5 changes: 5 additions & 0 deletions readme.md
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,12 @@ where `project` is the name of your project. You can then use the packages
themselves by adding

```cmake
set(SDL2_STATIC OFF) # on to link it statically

find_package(SDL2 REQUIRED)

add_definitions(${SDL2_DEFINITIONS})

find_package(SDL2_Image REQUIRED)
find_package(SDL2_ttf REQUIRED)

Expand Down