MSYS2 CMake/include updates

CMakeLists.txt

@@ -87,8 +87,10 @@ else()
 
 endif()
 
-
-if (WIN32 OR MINGW)
+if (MSYS)
+  set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
+  add_compile_definitions(__MSYS__) # This wasn't being added for me for some reason, even when using the MSYS generator - Dasho
+elseif (WIN32 OR MINGW)
   set(SDL2_DIR "${CMAKE_SOURCE_DIR}/libraries/sdl2")
 endif()
 

cmake/FindSDL2.cmake

@@ -0,0 +1,379 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#  Copyright 2019 Amine Ben Hassouna <amine.benhassouna@gmail.com>
+#  Copyright 2000-2019 Kitware, Inc. and Contributors
+#  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 name of Kitware, Inc. nor the names of 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.
+
+#[=======================================================================[.rst:
+FindSDL2
+--------
+
+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:
+
+::
+
+  SDL2_LIBRARIES, the name of the library to link against
+  SDL2_INCLUDE_DIRS, where to find SDL.h
+  SDL2_FOUND, if false, do not try to link to SDL2
+  SDL2MAIN_FOUND, if false, do not try to link to SDL2main
+  SDL2_VERSION_STRING, human-readable string containing the version of SDL2
+
+
+
+This module responds to the following cache variables:
+
+::
+
+  SDL2_PATH
+    Set a custom SDL2 Library path (default: empty)
+
+  SDL2_NO_DEFAULT_PATH
+    Disable search SDL2 Library in default path.
+      If SDL2_PATH (default: ON)
+      Else (default: OFF)
+
+  SDL2_INCLUDE_DIR
+    SDL2 headers path.
+
+  SDL2_LIBRARY
+    SDL2 Library (.dll, .so, .a, etc) path.
+
+  SDL2MAIN_LIBRAY
+    SDL2main Library (.a) path.
+
+  SDL2_BUILDING_LIBRARY
+    This flag is useful only when linking to SDL2_LIBRARIES insead of
+    SDL2::Main. It is required only when building a library that links to
+    SDL2_LIBRARIES, because only applications need main() (No need to also
+    link to SDL2main).
+    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
+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 in your project
+configuration, it means CMake did not find your SDL2 library
+(SDL2.dll, libsdl2.so, SDL2.framework, etc). Set SDL2_LIBRARY 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_LIBRARIES variable and the
+SDL2::Core and SDL2::Main targets, but when these values are unset,
+SDL2_LIBRARIES, SDL2::Core and SDL2::Main does not get created.
+
+
+$SDL2DIR is an environment variable that would correspond to the
+./configure --prefix=$SDL2DIR used in building SDL2.  l.e.galup 9-20-02
+
+
+
+Created by Amine Ben Hassouna:
+  Adapt FindSDL.cmake to SDL2 (FindSDL2.cmake).
+  Add cache variables for more flexibility:
+    SDL2_PATH, SDL2_NO_DEFAULT_PATH (for details, see doc above).
+  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:
+  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 SDLmain 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 value of SDL2_LIBRARY to
+override this selection or set the SDL2_PATH variable or the CMake
+environment CMAKE_INCLUDE_PATH to modify the search paths.
+
+Note that the header path has changed from SDL/SDL.h to just SDL.h
+This needed to change because "proper" SDL convention is #include
+"SDL.h", not <SDL/SDL.h>.  This is done for portability reasons
+because not all systems place things in SDL/ (see FreeBSD).
+#]=======================================================================]
+
+# Define options for searching SDL2 Library in a custom path
+
+set(SDL2_PATH "" CACHE STRING "Custom SDL2 Library path")
+
+set(_SDL2_NO_DEFAULT_PATH OFF)
+if(SDL2_PATH)
+  set(_SDL2_NO_DEFAULT_PATH ON)
+endif()
+
+set(SDL2_NO_DEFAULT_PATH ${_SDL2_NO_DEFAULT_PATH}
+    CACHE BOOL "Disable search SDL2 Library in default path")
+unset(_SDL2_NO_DEFAULT_PATH)
+
+set(SDL2_NO_DEFAULT_PATH_CMD)
+if(SDL2_NO_DEFAULT_PATH)
+  set(SDL2_NO_DEFAULT_PATH_CMD NO_DEFAULT_PATH)
+endif()
+
+# Search for the SDL2 include directory
+find_path(SDL2_INCLUDE_DIR SDL.h
+  HINTS
+    ENV SDL2DIR
+    ${SDL2_NO_DEFAULT_PATH_CMD}
+  PATH_SUFFIXES SDL2
+                # path suffixes to search inside ENV{SDL2DIR}
+                include/SDL2 include
+  PATHS ${SDL2_PATH}
+  DOC "Where the SDL2 headers can be found"
+)
+
+set(SDL2_INCLUDE_DIRS "${SDL2_INCLUDE_DIR}")
+
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  set(VC_LIB_PATH_SUFFIX lib/x64)
+else()
+  set(VC_LIB_PATH_SUFFIX lib/x86)
+endif()
+
+# SDL-2.0 is the name used by FreeBSD ports...
+# don't confuse it for the version number.
+find_library(SDL2_LIBRARY
+  NAMES SDL2 SDL-2.0
+  HINTS
+    ENV SDL2DIR
+    ${SDL2_NO_DEFAULT_PATH_CMD}
+  PATH_SUFFIXES lib ${VC_LIB_PATH_SUFFIX}
+  PATHS ${SDL2_PATH}
+  DOC "Where the SDL2 Library can be found"
+)
+
+set(SDL2_LIBRARIES "${SDL2_LIBRARY}")
+
+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.
+
+    if(SDL2_PATH)
+      set(SDL2MAIN_LIBRARY_PATHS "${SDL2_PATH}")
+    endif()
+
+    if(NOT SDL2_NO_DEFAULT_PATH)
+      set(SDL2MAIN_LIBRARY_PATHS
+            /sw
+            /opt/local
+            /opt/csw
+            /opt
+            "${SDL2MAIN_LIBRARY_PATHS}"
+      )
+    endif()
+
+    find_library(SDL2MAIN_LIBRARY
+      NAMES SDL2main
+      HINTS
+        ENV SDL2DIR
+        ${SDL2_NO_DEFAULT_PATH_CMD}
+      PATH_SUFFIXES lib ${VC_LIB_PATH_SUFFIX}
+      PATHS ${SDL2MAIN_LIBRARY_PATHS}
+      DOC "Where the SDL2main library can be found"
+    )
+    unset(SDL2MAIN_LIBRARY_PATHS)
+  endif()
+endif()
+
+# 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 QUIET)
+  if(NOT Threads_FOUND)
+    set(SDL2_THREADS_NOT_FOUND "Could NOT find Threads (Threads is required by SDL2).")
+    if(SDL2_FIND_REQUIRED)
+      message(FATAL_ERROR ${SDL2_THREADS_NOT_FOUND})
+    else()
+        if(NOT SDL2_FIND_QUIETLY)
+          message(STATUS ${SDL2_THREADS_NOT_FOUND})
+        endif()
+      return()
+    endif()
+    unset(SDL2_THREADS_NOT_FOUND)
+  endif()
+endif()
+
+# MinGW needs an additional link flag, -mwindows
+# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -mwindows
+if(MINGW)
+  set(MINGW32_LIBRARY mingw32 "-mwindows" CACHE STRING "link flags for MinGW")
+endif()
+
+if(SDL2_LIBRARY)
+  # For SDL2main
+  if(SDL2MAIN_LIBRARY AND NOT SDL2_BUILDING_LIBRARY)
+    list(FIND SDL2_LIBRARIES "${SDL2MAIN_LIBRARY}" _SDL2_MAIN_INDEX)
+    if(_SDL2_MAIN_INDEX EQUAL -1)
+      set(SDL2_LIBRARIES "${SDL2MAIN_LIBRARY}" ${SDL2_LIBRARIES})
+    endif()
+    unset(_SDL2_MAIN_INDEX)
+  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_LIBRARIES ${SDL2_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+  endif()
+
+  # For MinGW library
+  if(MINGW)
+    set(SDL2_LIBRARIES ${MINGW32_LIBRARY} ${SDL2_LIBRARIES})
+  endif()
+
+endif()
+
+# Read SDL2 version
+if(SDL2_INCLUDE_DIR AND EXISTS "${SDL2_INCLUDE_DIR}/SDL_version.h")
+  file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+[0-9]+$")
+  file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_MINOR_LINE REGEX "^#define[ \t]+SDL_MINOR_VERSION[ \t]+[0-9]+$")
+  file(STRINGS "${SDL2_INCLUDE_DIR}/SDL_version.h" SDL2_VERSION_PATCH_LINE REGEX "^#define[ \t]+SDL_PATCHLEVEL[ \t]+[0-9]+$")
+  string(REGEX REPLACE "^#define[ \t]+SDL_MAJOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MAJOR "${SDL2_VERSION_MAJOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+SDL_MINOR_VERSION[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_MINOR "${SDL2_VERSION_MINOR_LINE}")
+  string(REGEX REPLACE "^#define[ \t]+SDL_PATCHLEVEL[ \t]+([0-9]+)$" "\\1" SDL2_VERSION_PATCH "${SDL2_VERSION_PATCH_LINE}")
+  set(SDL2_VERSION_STRING ${SDL2_VERSION_MAJOR}.${SDL2_VERSION_MINOR}.${SDL2_VERSION_PATCH})
+  unset(SDL2_VERSION_MAJOR_LINE)
+  unset(SDL2_VERSION_MINOR_LINE)
+  unset(SDL2_VERSION_PATCH_LINE)
+  unset(SDL2_VERSION_MAJOR)
+  unset(SDL2_VERSION_MINOR)
+  unset(SDL2_VERSION_PATCH)
+endif()
+
+include(FindPackageHandleStandardArgs)
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2
+                                  REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR
+                                  VERSION_VAR SDL2_VERSION_STRING)
+
+if(SDL2MAIN_LIBRARY)
+  set(FPHSA_NAME_MISMATCHED 1)
+  FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2main
+                                    REQUIRED_VARS SDL2MAIN_LIBRARY SDL2_INCLUDE_DIR
+                                    VERSION_VAR SDL2_VERSION_STRING)
+endif()
+
+
+mark_as_advanced(SDL2_PATH
+                 SDL2_NO_DEFAULT_PATH
+                 SDL2_LIBRARY
+                 SDL2MAIN_LIBRARY
+                 SDL2_INCLUDE_DIR
+                 SDL2_BUILDING_LIBRARY)
+
+
+# SDL2:: targets (SDL2::Core and SDL2::Main)
+if(SDL2_FOUND)
+
+  # SDL2::Core target
+  if(SDL2_LIBRARY AND NOT TARGET SDL2::Core)
+    add_library(SDL2::Core UNKNOWN IMPORTED)
+    set_target_properties(SDL2::Core PROPERTIES
+                          IMPORTED_LOCATION "${SDL2_LIBRARY}"
+                          INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}")
+
+    if(APPLE)
+      # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
+      # For more details, please see above.
+      set_property(TARGET SDL2::Core APPEND PROPERTY
+                   INTERFACE_LINK_OPTIONS -framework Cocoa)
+    else()
+      # For threads, as mentioned Apple doesn't need this.
+      # For more details, please see above.
+      set_property(TARGET SDL2::Core APPEND PROPERTY
+                   INTERFACE_LINK_LIBRARIES Threads::Threads)
+    endif()
+  endif()
+
+  # SDL2::Main target
+  # Applications should link to SDL2::Main instead of SDL2::Core
+  # For more details, please see above.
+  if(NOT SDL2_BUILDING_LIBRARY AND NOT TARGET SDL2::Main)
+
+    if(SDL2_INCLUDE_DIR MATCHES ".framework" OR NOT SDL2MAIN_LIBRARY)
+      add_library(SDL2::Main INTERFACE IMPORTED)
+      set_property(TARGET SDL2::Main PROPERTY
+                   INTERFACE_LINK_LIBRARIES SDL2::Core)
+    elseif(SDL2MAIN_LIBRARY)
+      # MinGW requires that the mingw32 library is specified before the
+      # libSDL2main.a static library when linking.
+      # The SDL2::MainInternal target is used internally to make sure that
+      # CMake respects this condition.
+      add_library(SDL2::MainInternal UNKNOWN IMPORTED)
+      set_property(TARGET SDL2::MainInternal PROPERTY
+                   IMPORTED_LOCATION "${SDL2MAIN_LIBRARY}")
+      set_property(TARGET SDL2::MainInternal PROPERTY
+                   INTERFACE_LINK_LIBRARIES SDL2::Core)
+
+      add_library(SDL2::Main INTERFACE IMPORTED)
+
+      if(MINGW)
+        # MinGW needs an additional link flag '-mwindows' and link to mingw32
+        set_property(TARGET SDL2::Main PROPERTY
+                     INTERFACE_LINK_LIBRARIES "mingw32" "-mwindows")
+      endif()
+
+      set_property(TARGET SDL2::Main APPEND PROPERTY
+                   INTERFACE_LINK_LIBRARIES SDL2::MainInternal)
+    endif()
+
+  endif()
+endif()