Add support for MinGW cross compiling

.gitignore

@@ -2,4 +2,5 @@ build/current
 build/gba
 build/debug
 build/release
+build/windows
 tags

Makefile

@@ -26,6 +26,8 @@ devenv:
 		--name ${DEVENV} -t wombatant/devenv bash
 devenv-destroy:
 	docker rm -f ${DEVENV}
+devenv-shell:
+	docker exec -i --user $(shell id -u ${USER}) ${DEVENV} ls /usr/bin/x86_64-w64-mingw32-g++
 
 native:
 	${ENV_RUN} rm -rf build/release
@@ -39,6 +41,12 @@ native_debug:
 	${ENV_RUN} rm -f build/current
 	${ENV_RUN} ln -s debug build/current
 
+windows:
+	${ENV_RUN} rm -rf build/windows
+	${ENV_RUN} ./scripts/setup_build windows
+	${ENV_RUN} rm -f build/current
+	${ENV_RUN} ln -s windows build/current
+
 gba:
 	${ENV_RUN} rm -rf build/gba
 	${ENV_RUN} ./scripts/setup_build_gba

build/Makefile

@@ -1,4 +1,4 @@
-all: gba_build native_build native_debug_build
+all: gba_build native_build native_debug_build windows_build
 
 gba_build:
 	@if [ -d gba ]; then \
@@ -14,3 +14,8 @@ native_debug_build:
 	@if [ -d debug ]; then \
 		make -C debug ${ARGS}; \
 	fi
+
+windows_build:
+	@if [ -d windows ]; then \
+		make -C windows ${ARGS}; \
+	fi

cmake/Modules/GBA.cmake

@@ -39,5 +39,3 @@ find_path(GBA_INCLUDE_DIR gba.h
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(GBA DEFAULT_MSG GBA_LIBRARY)
-
-set(CMAKE_INSTALL_PREFIX ${DEVKITARM})

cmake/Modules/Mingw.cmake

@@ -0,0 +1,18 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+# cross compilers to use for C and C++
+set(CMAKE_C_COMPILER /usr/bin/${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER /usr/bin/${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_RC_COMPILER /usr/bin/${TOOLCHAIN_PREFIX}-windres)
+
+# target environment on the build host system
+#   set 1st to dir with the cross compiler's C/C++ headers/libs
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+
+# modify default behavior of FIND_XXX() commands to
+# search for headers/libs in the target environment and
+# search for programs in the build host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

scripts/setup_build

@@ -1,8 +1,18 @@
 #! /usr/bin/env bash
 project=$(pwd)/
-buildDir="build/release"
+
+TARGET=$1
+
+if [[ $TARGET == windows ]]; then
+	toolchain="-DCMAKE_TOOLCHAIN_FILE=cmake/Modules/Mingw.cmake"
+	buildDir="build/windows"
+else
+	buildDir="build/release"
+fi
 
 mkdir -p $buildDir
 pushd $buildDir
-cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=Release $project
+cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=Release \
+		$toolchain \
+		$project
 popd

src/ox/std/types.hpp

@@ -14,7 +14,7 @@ typedef unsigned short     uint16_t;
 typedef int                int32_t;
 typedef unsigned int       uint32_t;
 typedef unsigned           uint_t;
-#if  defined(_MSC_VER) || defined(__APPLE__)
+#if defined(_WIN32) || defined(__APPLE__)
 typedef long long          int64_t;
 typedef unsigned long long uint64_t;
 #else