From 12e91f45fe3c3cf84adea8e6036360415dc43d97 Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Wed, 19 Aug 2020 00:08:17 +1000
Subject: [PATCH] CI: Add Linux AArch64 builds

---
 .github/workflows/rolling-release.yml      | 28 +++++++++++++++++++---
 CMakeModules/aarch64-cross-toolchain.cmake | 14 +++++++++++
 README.md                                  |  3 ++-
 3 files changed, 41 insertions(+), 4 deletions(-)
 create mode 100644 CMakeModules/aarch64-cross-toolchain.cmake

diff --git a/.github/workflows/rolling-release.yml b/.github/workflows/rolling-release.yml
index 698d1bebd..46f815090 100644
--- a/.github/workflows/rolling-release.yml
+++ b/.github/workflows/rolling-release.yml
@@ -144,6 +144,12 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Install packages
+      shell: bash
+      run: |
+        sudo apt-get update
+        sudo apt-get -y install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
+
     - name: Compile and zip Linux x64 libretro core
       shell: bash
       run: |
@@ -151,13 +157,28 @@ jobs:
         cd build-libretro-linux-x64
         cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_LIBRETRO_CORE=ON ..
         cmake --build . --parallel 2
-        zip -j duckstation_libretro.so.zip duckstation_libretro.so
+        zip -j duckstation_libretro_x64.so.zip duckstation_libretro.so
 
     - name: Upload Linux x64 libretro core
       uses: actions/upload-artifact@v1
       with:
         name: "linux-libretro"
-        path: "build-libretro-linux-x64/duckstation_libretro.so.zip"
+        path: "build-libretro-linux-x64/duckstation_libretro_x64.so.zip"
+
+    - name: Compile and zip Linux AArch64 libretro core
+      shell: bash
+      run: |
+        mkdir build-libretro-linux-aarch64
+        cd build-libretro-linux-aarch64
+        cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_LIBRETRO_CORE=ON -DCMAKE_TOOLCHAIN_FILE=../CMakeModules/aarch64-cross-toolchain.cmake ..
+        cmake --build . --parallel 2
+        zip -j duckstation_libretro_linux_aarch64.so.zip duckstation_libretro.so
+      
+    - name: Upload Linux AArch64 libretro core
+      uses: actions/upload-artifact@v1
+      with:
+        name: "linux-libretro"
+        path: "build-libretro-linux-aarch64/duckstation_libretro_linux_aarch64.so.zip"
 
     - name: Compile and zip Android AArch64 libretro core
       shell: bash
@@ -271,7 +292,8 @@ jobs:
             linux-x64-appimage-sdl-zsync/duckstation-sdl-x64.AppImage.zsync
             linux-x64-appimage-qt/duckstation-qt-x64.AppImage
             linux-x64-appimage-qt-zsync/duckstation-qt-x64.AppImage.zsync
-            linux-libretro/duckstation_libretro.so.zip
+            linux-libretro/duckstation_libretro_x64.so.zip
+            linux-libretro/duckstation_libretro_linux_aarch64.so.zip
             linux-libretro/duckstation_libretro_android_aarch64.so.zip
             android/duckstation-android-aarch64.apk
 
diff --git a/CMakeModules/aarch64-cross-toolchain.cmake b/CMakeModules/aarch64-cross-toolchain.cmake
new file mode 100644
index 000000000..1391797b7
--- /dev/null
+++ b/CMakeModules/aarch64-cross-toolchain.cmake
@@ -0,0 +1,14 @@
+# Source: https://github.com/stenzek/duckstation/issues/626#issuecomment-660718306
+
+# Target system
+SET(CMAKE_SYSTEM_NAME Linux)
+SET(CMAKE_SYSTEM_PROCESSOR aarch64)
+SET(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_CROSSCOMPILING TRUE)
+
+# Cross compiler
+SET(CMAKE_C_COMPILER   aarch64-linux-gnu-gcc)
+SET(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
+set(CMAKE_LIBRARY_ARCHITECTURE aarch64-linux-gnu)
+
+set(THREADS_PTHREAD_ARG "0" CACHE STRING "Result from TRY_RUN" FORCE)
diff --git a/README.md b/README.md
index 99ecff446..f08e0028a 100644
--- a/README.md
+++ b/README.md
@@ -228,7 +228,8 @@ DuckStation is available as a libretro core, which can be loaded into a frontend
 
 Prebuilt binaries for 64-bit Windows, Linux and Android can be found on the releases page. Direct links:
 - 64-bit Windows: https://github.com/stenzek/duckstation/releases/download/latest/duckstation_libretro.dll.zip
-- 64-bit Linux: https://github.com/stenzek/duckstation/releases/download/latest/duckstation_libretro.so.zip
+- 64-bit Linux: https://github.com/stenzek/duckstation/releases/download/latest/duckstation_libretro_x64.so.zip
+- AArch64 Linux: https://github.com/stenzek/duckstation/releases/download/latest/duckstation_libretro_aarch64.so.zip
 - AArch64 Android: https://github.com/stenzek/duckstation/releases/download/latest/duckstation_libretro_android_aarch64.so.zip
 
 To use, download and extract, and install the core file in RetroArch or your preferred frontend.