From 8ea97e9b31b661e570421ec259b86bf956589628 Mon Sep 17 00:00:00 2001
From: "Amine B. Hassouna" <amine.benhassouna@gmail.com>
Date: Sun, 10 Feb 2019 21:38:14 +0100
Subject: [PATCH] Update cmake/sdl2

---
 cmake/sdl2/FindSDL2.cmake | 52 ++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 22 deletions(-)

diff --git a/cmake/sdl2/FindSDL2.cmake b/cmake/sdl2/FindSDL2.cmake
index 42c4ffb..c20d809 100644
--- a/cmake/sdl2/FindSDL2.cmake
+++ b/cmake/sdl2/FindSDL2.cmake
@@ -59,6 +59,7 @@ 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
 
 
@@ -310,9 +311,15 @@ endif()
 include(FindPackageHandleStandardArgs)
 
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2
-                                  REQUIRED_VARS SDL2_LIBRARIES SDL2_INCLUDE_DIRS
+                                  REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR
                                   VERSION_VAR SDL2_VERSION_STRING)
 
+if(SDL2MAIN_LIBRARY)
+  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
@@ -343,16 +350,6 @@ if(SDL2_FOUND)
       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
@@ -360,20 +357,31 @@ if(SDL2_FOUND)
   # For more details, please see above.
   if(NOT SDL2_BUILDING_LIBRARY AND NOT TARGET SDL2::Main)
 
-    if(SDL2_INCLUDE_DIR MATCHES ".framework" )
+    if(SDL2_INCLUDE_DIR MATCHES ".framework" OR NOT SDL2MAIN_LIBRARY)
       add_library(SDL2::Main INTERFACE IMPORTED)
-    elseif(SDL2MAIN_LIBRARY)
-      add_library(SDL2::Main UNKNOWN IMPORTED)
-      set_property(TARGET SDL2::Main PROPERTY
-                   IMPORTED_LOCATION "${SDL2MAIN_LIBRARY}")
-    elseif(UNIX)
-      add_library(SDL2::Main INTERFACE IMPORTED)
-    endif()
-
-    # Add SDL2::Core as a dependency
-    if(TARGET SDL2::Main)
       set_property(TARGET SDL2::Main PROPERTY
                    INTERFACE_LINK_LIBRARIES SDL2::Core)
+    elseif(SDL2MAIN_LIBRARY)
+      # MinGW requires that the mingw32 library is specified before the
+      # libSDL2main.a static library when linking.
+      # The SDL2::MainInternal target is used internally to make sure that
+      # CMake respects this condition.
+      add_library(SDL2::MainInternal UNKNOWN IMPORTED)
+      set_property(TARGET SDL2::MainInternal PROPERTY
+                   IMPORTED_LOCATION "${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()