From 87e44b700b6c80eaf7757e3a2747560ce5b6f7dc Mon Sep 17 00:00:00 2001
From: Nixola <niki.or97@yahoo.it>
Date: Thu, 7 Oct 2021 11:53:56 +0200
Subject: [PATCH] Mingw cross compilation (#24)

* Fixed icon filename capitalization

* Created mingw cmake toolchain

* Adjusted CMakeLists.txt for compatibility

* Small mingwcc.cmake cleanup

* Added cross-compilation instructions to readme

* Update README.md

Fixed typo

Co-authored-by: Nicola Orlando <nicolaorlando24@gmail.com>
Co-authored-by: Muzychenko Andrey <33288308+k4zmu2a@users.noreply.github.com>
---
 CMakeLists.txt                         | 14 ++++++++++----
 README.md                              |  3 ++-
 SpaceCadetPinball/SpaceCadetPinball.rc |  2 +-
 mingwcc.cmake                          | 25 +++++++++++++++++++++++++
 4 files changed, 38 insertions(+), 6 deletions(-)
 create mode 100644 mingwcc.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 89da6bd..db5a714 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,8 +10,8 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMakeModules")
 
 # On Windows, set paths to SDL-devel packages here
 if(WIN32)
-   set(SDL2_PATH "${CMAKE_CURRENT_LIST_DIR}/Libs/SDL2")
-   set(SDL2_MIXER_PATH "${CMAKE_CURRENT_LIST_DIR}/Libs/SDL2_mixer")
+   list(APPEND SDL2_PATH "${CMAKE_CURRENT_LIST_DIR}/Libs/SDL2")
+   list(APPEND SDL2_MIXER_PATH "${CMAKE_CURRENT_LIST_DIR}/Libs/SDL2_mixer")
 endif()
 
 # SDL2main is not needed
@@ -195,8 +195,14 @@ target_link_libraries(SpaceCadetPinball ${SDL2_LIBRARY} ${SDL2_MIXER_LIBRARY})
 
 # On Windows, copy DLL to output
 if(WIN32)
-    get_filename_component(SDL2_DLL_PATH ${SDL2_LIBRARY} DIRECTORY)
-    get_filename_component(SDL2_MIXER_DLL_PATH ${SDL2_MIXER_LIBRARY} DIRECTORY)
+    list(POP_BACK SDL2_LIBRARY SDL2_DLL_PATH)
+    list(POP_BACK SDL2_MIXER_LIBRARY SDL2_MIXER_DLL_PATH)
+    get_filename_component(SDL2_DLL_PATH ${SDL2_DLL_PATH} DIRECTORY)
+    get_filename_component(SDL2_MIXER_DLL_PATH ${SDL2_MIXER_DLL_PATH} DIRECTORY)
+    if(MINGW)
+        string(REGEX REPLACE "lib$" "bin" SDL2_DLL_PATH ${SDL2_DLL_PATH})
+        string(REGEX REPLACE "lib$" "bin" SDL2_MIXER_DLL_PATH ${SDL2_MIXER_DLL_PATH})
+    endif()
     message(STATUS "copy paths='${SDL2_DLL_PATH}' '${SDL2_MIXER_DLL_PATH}'") 
     add_custom_command(TARGET SpaceCadetPinball POST_BUILD
         COMMAND ${CMAKE_COMMAND} -E copy_if_different "${SDL2_DLL_PATH}/SDL2.dll" $<TARGET_FILE_DIR:SpaceCadetPinball>
diff --git a/README.md b/README.md
index d963574..3b730d6 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,8 @@ Compile with Visual Studio; tested with 2019.
 
 On Linux:\
 Install devel packages for `SDL2` and `SDL2_mixer`.\
-Compile with CMake; tested with GCC 10, Clang 11. 
+Compile with CMake; tested with GCC 10, Clang 11.\
+To cross-compile for Windows, install a 64-bit version of mingw and its `SDL2` and `SDL2_mixer` distributions, then use the `mingwcc.cmake` toolchain. 
 
 On macOS:\
 **Homebrew**: Install the `SDL2`, `SDL2_mixer` homebrew packages.\
diff --git a/SpaceCadetPinball/SpaceCadetPinball.rc b/SpaceCadetPinball/SpaceCadetPinball.rc
index c372b1e..d7b380b 100644
--- a/SpaceCadetPinball/SpaceCadetPinball.rc
+++ b/SpaceCadetPinball/SpaceCadetPinball.rc
@@ -1 +1 @@
-ICON_1 ICON "icon_1.ico"
\ No newline at end of file
+ICON_1 ICON "Icon_1.ico"
diff --git a/mingwcc.cmake b/mingwcc.cmake
new file mode 100644
index 0000000..5c26b26
--- /dev/null
+++ b/mingwcc.cmake
@@ -0,0 +1,25 @@
+set(TOOLCHAIN_PREFIX "x86_64-w64-mingw32")
+
+set(CMAKE_SYSTEM_NAME Windows)
+
+set(CMAKE_CXX_COMPILER "${TOOLCHAIN_PREFIX}-g++")
+set(CMAKE_C_COMPILER "${TOOLCHAIN_PREFIX}-gcc")
+set(CMAKE_OBJCOPY "${TOOLCHAIN_PREFIX}-objcopy")
+set(CMAKE_STRIP "${TOOLCHAIN_PREFIX}-strip")
+set(CMAKE_SIZE "${TOOLCHAIN_PREFIX}-size")
+set(CMAKE_AR "${TOOLCHAIN_PREFIX}-ar")
+set(ASSEMBLER "${TOOLCHAIN_PREFIX}-as")
+
+
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+
+# adjust the default behavior of the find commands:
+# search headers and libraries in the target environment
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) 
+
+# search programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+# Add the path to your toolchain version of SDL2
+set(SDL2_PATH /usr/${TOOLCHAIN_PREFIX})
\ No newline at end of file