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Modernize FindSDL2.cmake (SDL2::Core and SDL2::Main)

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This commit is contained in:
Amine B. Hassouna 2019-02-03 09:53:23 +01:00
parent 057e44d4de
commit e320b353ad
1 changed files with 82 additions and 7 deletions
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89
FindSDL2.cmake
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@ -7,6 +7,20 @@ FindSDL2
Locate SDL2 library Locate SDL2 library
This module defines the following 'IMPORTED' targets:
::
SDL2::Core
The SDL2 library, if found.
Libraries should link to SDL2::Core
SDL2::Main
The SDL2main library, if found.
Applications should link to SDL2::Main instead of SDL2::Core
This module will set the following variables in your project: This module will set the following variables in your project:
:: ::
@ -40,11 +54,12 @@ This module responds to the following cache variables:
SDL2main Library (.a) path. SDL2main Library (.a) path.
SDL2_BUILDING_LIBRARY SDL2_BUILDING_LIBRARY
If this is defined, then no SDL2main will be linked in because This flag is useful only when linking to SDL2_LIBRARIES insead of
only applications need main(). SDL2::Main. It is required only when building a library that links to
Otherwise, it is assumed you are building an application and this SDL2_LIBRARIES, because only applications need main() (No need to also
module will attempt to locate and set the proper link flags link to SDL2main).
as part of the returned SDL2_LIBRARIES variable. If this flag is defined, then no SDL2main will be added to SDL2_LIBRARIES
and no SDL2::Main target will be created.
Don't forget to include SDLmain.h and SDLmain.m in your project for the Don't forget to include SDLmain.h and SDLmain.m in your project for the
@ -58,8 +73,9 @@ configuration, it means CMake did not find your SDL2 library
(SDL2.dll, libsdl2.so, SDL2.framework, etc). Set SDL2_LIBRARY to point (SDL2.dll, libsdl2.so, SDL2.framework, etc). Set SDL2_LIBRARY to point
to your SDL2 library, and configure again. Similarly, if you see an to your SDL2 library, and configure again. Similarly, if you see an
empty SDL2MAIN_LIBRARY, you should set this value as appropriate. These empty SDL2MAIN_LIBRARY, you should set this value as appropriate. These
values are used to generate the final SDL2_LIBRARIES variable, but when values are used to generate the final SDL2_LIBRARIES variable and the
these values are unset, SDL2_LIBRARIES does not get created. SDL2::Core and SDL2::Main targets, but when these values are unset,
SDL2_LIBRARIES, SDL2::Core and SDL2::Main does not get created.
$SDL2DIR is an environment variable that would correspond to the $SDL2DIR is an environment variable that would correspond to the
@ -72,6 +88,8 @@ Created by Amine Ben Hassouna:
Add cache variables for more flexibility: Add cache variables for more flexibility:
SDL2_PATH, SDL2_NO_DEFAULT_PATH (for details, see doc above). SDL2_PATH, SDL2_NO_DEFAULT_PATH (for details, see doc above).
Mark 'Threads' as a required dependency for non-OSX systems. Mark 'Threads' as a required dependency for non-OSX systems.
Modernize the FindSDL2.cmake module by creating specific targets:
SDL2::Core and SDL2::Main (for details, see doc above).
Original FindSDL.cmake module: Original FindSDL.cmake module:
@ -272,3 +290,60 @@ mark_as_advanced(SDL2_PATH
SDL2_INCLUDE_DIR SDL2_INCLUDE_DIR
SDL2_BUILDING_LIBRARY) SDL2_BUILDING_LIBRARY)
# SDL2:: targets (SDL2::Core and SDL2::Main)
if(SDL2_FOUND)
# SDL2::Core target
if(SDL2_LIBRARY AND NOT TARGET SDL2::Core)
add_library(SDL2::Core UNKNOWN IMPORTED)
set_target_properties(SDL2::Core PROPERTIES
IMPORTED_LOCATION "${SDL2_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}")
if(APPLE)
# For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
# For more details, please see above.
set_property(TARGET SDL2::Core APPEND PROPERTY
INTERFACE_LINK_OPTIONS "-framework Cocoa")
else()
# For threads, as mentioned Apple doesn't need this.
# For more details, please see above.
set_property(TARGET SDL2::Core APPEND PROPERTY
INTERFACE_LINK_LIBRARIES Threads::Threads)
endif()
# MinGW needs an additional link flag, -mwindows
# and link to mingw32
if(MINGW)
set_property(TARGET SDL2::Core APPEND PROPERTY
INTERFACE_LINK_LIBRARIES mingw32)
set_property(TARGET SDL2::Core APPEND PROPERTY
INTERFACE_LINK_OPTIONS "-mwindows")
endif()
endif()
# SDL2::Main target
# Applications should link to SDL2::Main instead of SDL2::Core
# For more details, please see above.
if(NOT SDL2_BUILDING_LIBRARY AND NOT TARGET SDL2::Main)
if(SDL2_INCLUDE_DIR MATCHES ".framework" )
add_library(SDL2::Main INTERFACE IMPORTED)
elseif(SDL2MAIN_LIBRARY)
add_library(SDL2::Main UNKNOWN IMPORTED)
set_property(TARGET SDL2::Main PROPERTY
IMPORTED_LOCATION "${SDL2MAIN_LIBRARY}")
elseif(UNIX)
add_library(SDL2::Main INTERFACE IMPORTED)
endif()
# Add SDL2::Core as a dependency
if(TARGET SDL2::Main)
set_property(TARGET SDL2::Main PROPERTY
INTERFACE_LINK_LIBRARIES SDL2::Core)
endif()
endif()
endif()