[Build] Add devkitpro-based libretro targets to CI

.github/workflows/devkitpro-build.yml

@@ -0,0 +1,33 @@
+name: Libretro Latest devkitppc builds
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        target_name: [ngc, wii, wiiu, switch]
+        build_type: [release, debug]
+        include:
+          - libretro_build: 'DEBUG=0'
+            build_type: release
+          - libretro_build: 'DEBUG=1'
+            build_type: debug
+          - devkit_container: 'devkitpro/devkitppc:latest'
+            target_name: ngc
+          - devkit_container: 'devkitpro/devkitppc:latest'
+            target_name: wii
+          - devkit_container: 'devkitpro/devkitppc:latest'
+            target_name: wiiu
+          - devkit_container: 'devkitpro/devkita64:latest'
+            target_name: switch
+    runs-on: ubuntu-latest
+    container: ${{ matrix.devkit_container }}
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v4
+        with: 
+          submodules: recursive
+
+      # Libretro build
+      - name: Build libretro core
+        run: make -C src/libretro ${{ matrix.libretro_build }} platform=${{ matrix.target_name }}

src/libretro/Makefile

@@ -316,23 +316,12 @@ else ifeq ($(platform), wiiu)
 	STATIC_LINKING=1
 	TILED_RENDERING=1
 
-# Nintendo Switch (libnx)
-else ifeq ($(platform), libnx)
-	include $(DEVKITPRO)/libnx/switch_rules
-	TARGET := $(TARGET_NAME)_libretro_$(platform).a
-	DEFINES := -DSWITCH=1 -U__linux__ -U__linux -DRARCH_INTERNAL -DHAVE_THREADS=1
-	CFLAGS := $(DEFINES) -g -O3 \
-		      -fPIE -I$(LIBNX)/include/ -ffunction-sections -fdata-sections -ftls-model=local-exec -Wl,--allow-multiple-definition -specs=$(LIBNX)/switch.specs
-	CFLAGS += $(INCDIRS)
-	CFLAGS += $(INCLUDE) -D__SWITCH__ -DHAVE_LIBNX
-	CXXFLAGS := $(ASFLAGS) $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
-	CFLAGS += -std=gnu11
-	STATIC_LINKING=1
-
-# Nintendo Switch (libtransistor)
+# Nintendo Switch
 else ifeq ($(platform), switch)
 	TARGET := $(TARGET_NAME)_libretro_$(platform).a
-	include $(LIBTRANSISTOR_HOME)/libtransistor.mk
+	CC = $(DEVKITPRO)/devkitA64/bin/aarch64-none-elf-gcc$(EXE_EXT)
+	CXX = $(DEVKITPRO)/devkitA64/bin/aarch64-none-elf-g++$(EXE_EXT)
+	AR = $(DEVKITPRO)/devkitA64/bin/aarch64-none-elf-ar$(EXE_EXT)
 	STATIC_LINKING=1
 	TILED_RENDERING=1