SDL: Added toolchain files for cross-compiling to Windows

From 6d103303e79adfe6c030a4cd6886d7551a940220 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 24 Nov 2022 10:38:18 -0800
Subject: [PATCH] Added toolchain files for cross-compiling to Windows

---
 build-scripts/cmake-toolchain-mingw64-i686.cmake   | 13 +++++++++++++
 build-scripts/cmake-toolchain-mingw64-x86_64.cmake | 13 +++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 build-scripts/cmake-toolchain-mingw64-i686.cmake
 create mode 100644 build-scripts/cmake-toolchain-mingw64-x86_64.cmake

diff --git a/build-scripts/cmake-toolchain-mingw64-i686.cmake b/build-scripts/cmake-toolchain-mingw64-i686.cmake
new file mode 100644
index 000000000000..22260e1f58ea
--- /dev/null
+++ b/build-scripts/cmake-toolchain-mingw64-i686.cmake
@@ -0,0 +1,13 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86)
+
+find_program(CMAKE_C_COMPILER NAMES i686-w64-mingw32-gcc)
+find_program(CMAKE_CXX_COMPILER NAMES i686-w64-mingw32-g++)
+
+if(NOT CMAKE_C_COMPILER)
+	message(FATAL_ERROR "Failed to find CMAKE_C_COMPILER.")
+endif()
+
+if(NOT CMAKE_CXX_COMPILER)
+	message(FATAL_ERROR "Failed to find CMAKE_CXX_COMPILER.")
+endif()
diff --git a/build-scripts/cmake-toolchain-mingw64-x86_64.cmake b/build-scripts/cmake-toolchain-mingw64-x86_64.cmake
new file mode 100644
index 000000000000..c8135ba9b0c2
--- /dev/null
+++ b/build-scripts/cmake-toolchain-mingw64-x86_64.cmake
@@ -0,0 +1,13 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+
+find_program(CMAKE_C_COMPILER NAMES x86_64-w64-mingw32-gcc)
+find_program(CMAKE_CXX_COMPILER NAMES x86_64-w64-mingw32-g++)
+
+if(NOT CMAKE_C_COMPILER)
+	message(FATAL_ERROR "Failed to find CMAKE_C_COMPILER.")
+endif()
+
+if(NOT CMAKE_CXX_COMPILER)
+	message(FATAL_ERROR "Failed to find CMAKE_CXX_COMPILER.")
+endif()