use config mode for finding SDL2 with CMake

2 files changed, 6 insertions, 244 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc782e252..44ed4196d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -151,15 +151,16 @@ if (ENABLE_SDL2)
         set(SDL2_INCLUDE_DIR "${SDL2_PREFIX}/include" CACHE PATH "Path to SDL2 headers")
         set(SDL2_LIBRARY "${SDL2_PREFIX}/lib/x64/SDL2.lib" CACHE PATH "Path to SDL2 library")
         set(SDL2_DLL_DIR "${SDL2_PREFIX}/lib/x64/" CACHE PATH "Path to SDL2.dll")
-    else()
-        find_package(SDL2 REQUIRED)
-    endif()
 
-    if (SDL2_FOUND)
-        # TODO(yuriks): Make FindSDL2.cmake export an IMPORTED library instead
         add_library(SDL2 INTERFACE)
         target_link_libraries(SDL2 INTERFACE "${SDL2_LIBRARY}")
         target_include_directories(SDL2 INTERFACE "${SDL2_INCLUDE_DIR}")
+    else()
+        find_package(SDL2 REQUIRED)
+        include_directories(${SDL2_INCLUDE_DIRS})
+
+        add_library(SDL2 INTERFACE)
+        target_link_libraries(SDL2 INTERFACE "${SDL2_LIBRARIES}")
     endif()
 else()
     set(SDL2_FOUND NO)
diff --git a/externals/cmake-modules/FindSDL2.cmake b/externals/cmake-modules/FindSDL2.cmake
deleted file mode 100644
index 22ce752c5..000000000
--- a/externals/cmake-modules/FindSDL2.cmake
+++ /dev/null
@@ -1,239 +0,0 @@
-
-# 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
-# SDL2_DLL_DIR, where to find SDL2.dll if it exists
-#
-# This module responds to the the flag:
-# SDL2_BUILDING_LIBRARY
-# If this is defined, then no SDL2main will be linked in because
-# only applications need main().
-# Otherwise, it is assumed you are building an application and this
-# module will attempt to locate and set the the proper link flags
-# as part of the returned SDL2_LIBRARY variable.
-#
-# 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
-# module will automatically add the -framework Cocoa on your behalf.
-#
-#
-# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
-# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
-# (SDL2.dll, libsdl2.so, SDL2.framework, etc).
-# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
-# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
-# as appropriate. These values are used to generate the final SDL2_LIBRARY
-# variable, but when these values are unset, SDL2_LIBRARY does not get created.
-#
-#
-# $SDL2DIR is an environment variable that would
-# correspond to the ./configure --prefix=$SDL2DIR
-# used in building SDL2.
-# l.e.galup  9-20-02
-#
-# Modified by Eric Wing.
-# Added code to assist with automated building by using environmental variables
-# and providing a more controlled/consistent search behavior.
-# Added new modifications to recognize OS X frameworks and
-# additional Unix paths (FreeBSD, etc).
-# Also corrected the header search path to follow "proper" SDL guidelines.
-# Added a search for SDL2main which is needed by some platforms.
-# Added a search for threads which is needed by some platforms.
-# Added needed compile switches for MinGW.
-#
-# On OSX, this will prefer the Framework version (if found) over others.
-# People will have to manually change the cache values of
-# 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
-# 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).
-
-#=============================================================================
-# Copyright 2003-2009 Kitware, Inc.
-#
-# Distributed under the OSI-approved BSD License (the "License").
-#
-# This software is distributed WITHOUT ANY WARRANTY; without even the
-# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-# See the License for more information.
-#=============================================================================
-# CMake - Cross Platform Makefile Generator
-# Copyright 2000-2016 Kitware, Inc.
-# Copyright 2000-2011 Insight Software Consortium
-# All rights reserved.
-# 
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-# 
-# * Redistributions of source code must retain the above copyright
-#   notice, this list of conditions and the following disclaimer.
-# 
-# * Redistributions in binary form must reproduce the above copyright
-#   notice, this list of conditions and the following disclaimer in the
-#   documentation and/or other materials provided with the distribution.
-# 
-# * Neither the names of Kitware, Inc., the Insight Software Consortium,
-#   nor the names of their contributors may be used to endorse or promote
-#   products derived from this software without specific prior written
-#   permission.
-# 
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-# 
-# ------------------------------------------------------------------------------
-# 
-# The above copyright and license notice applies to distributions of
-# CMake in source and binary form.  Some source files contain additional
-# notices of original copyright by their contributors; see each source
-# for details.  Third-party software packages supplied with CMake under
-# compatible licenses provide their own copyright notices documented in
-# corresponding subdirectories.
-# 
-# ------------------------------------------------------------------------------
-# 
-# CMake was initially developed by Kitware with the following sponsorship:
-# 
-#  * National Library of Medicine at the National Institutes of Health
-#    as part of the Insight Segmentation and Registration Toolkit (ITK).
-# 
-#  * US National Labs (Los Alamos, Livermore, Sandia) ASC Parallel
-#    Visualization Initiative.
-# 
-#  * National Alliance for Medical Image Computing (NAMIC) is funded by the
-#    National Institutes of Health through the NIH Roadmap for Medical Research,
-#    Grant U54 EB005149.
-# 
-#  * Kitware, Inc.
-#
-
-message("<FindSDL2.cmake>")
-
-SET(SDL2_SEARCH_PATHS
-    ~/Library/Frameworks
-    /Library/Frameworks
-    /usr/local
-    /usr
-    /sw # Fink
-    /opt/local # DarwinPorts
-    /opt/csw # Blastwave
-    /opt
-    ${SDL2_PATH}
-)
-
-if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-    set(VC_LIB_PATH_SUFFIX lib/x64)
-else()
-    set(VC_LIB_PATH_SUFFIX lib/x86)
-endif()
-
-FIND_LIBRARY(SDL2_LIBRARY_TEMP
-    NAMES SDL2
-    HINTS
-    $ENV{SDL2DIR}
-    PATH_SUFFIXES lib64 lib ${VC_LIB_PATH_SUFFIX}
-    PATHS ${SDL2_SEARCH_PATHS}
-)
-
-IF(SDL2_LIBRARY_TEMP)
-    if(MSVC)
-        get_filename_component(SDL2_DLL_DIR_TEMP ${SDL2_LIBRARY_TEMP} DIRECTORY)
-        if(EXISTS ${SDL2_DLL_DIR_TEMP}/SDL2.dll)
-            set(SDL2_DLL_DIR ${SDL2_DLL_DIR_TEMP})
-            unset(SDL2_DLL_DIR_TEMP)
-        endif()
-    endif()
-
-    FIND_PATH(SDL2_INCLUDE_DIR SDL.h
-        HINTS
-        $ENV{SDL2DIR}
-        PATH_SUFFIXES include/SDL2 include
-        PATHS ${SDL2_SEARCH_PATHS}
-    )
-
-    IF(NOT SDL2_BUILDING_LIBRARY)
-        IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
-            # Non-OS X framework versions expect you to also dynamically link to
-            # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
-            # seem to provide SDL2main for compatibility even though they don't
-            # necessarily need it.
-            FIND_LIBRARY(SDL2MAIN_LIBRARY
-                NAMES SDL2main
-                HINTS
-                $ENV{SDL2DIR}
-                PATH_SUFFIXES lib64 lib
-                PATHS ${SDL2_SEARCH_PATHS}
-            )
-        ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
-    ENDIF(NOT SDL2_BUILDING_LIBRARY)
-
-    # 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.
-    # But for non-OSX systems, I will use the CMake Threads package.
-    IF(NOT APPLE)
-        FIND_PACKAGE(Threads)
-    ENDIF(NOT APPLE)
-
-    # MinGW needs an additional library, mwindows
-    # It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -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(MINGW)
-
-    # For SDL2main
-    IF(NOT SDL2_BUILDING_LIBRARY)
-        IF(SDL2MAIN_LIBRARY)
-            SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
-        ENDIF(SDL2MAIN_LIBRARY)
-    ENDIF(NOT SDL2_BUILDING_LIBRARY)
-
-    # For OS X, SDL2 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(APPLE)
-
-    # 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(NOT APPLE)
-
-    # For MinGW library
-    IF(MINGW)
-        SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
-    ENDIF(MINGW)
-
-    # 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")
-
-    # Unset the temp variable to INTERNAL so it is not seen in the CMake GUI
-    UNSET(SDL2_LIBRARY_TEMP)
-ENDIF(SDL2_LIBRARY_TEMP)
-
-message("</FindSDL2.cmake>")
-
-INCLUDE(FindPackageHandleStandardArgs)
-
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)