add workflow for build verification of examples

.github/workflows/build-examples.yml

@@ -0,0 +1,67 @@
+name: build-examples
+
+on: [push, pull_request]
+
+jobs:
+  build-examples:
+    runs-on: ubuntu-22.04
+    steps:
+      # Checkout repository
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      # Install build dependencies
+      - name: Install build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install build-essential clang bison flex libreadline-dev gawk \
+                                  tcl-dev libffi-dev git graphviz xdot pkg-config python3 \
+                                  libboost-system-dev libboost-python-dev libboost-filesystem-dev \
+                                  zlib1g-dev cmake libboost-all-dev libeigen3-dev libftdi-dev \
+                                  python3-dev python3-pip
+
+      # Install icestorm
+      - name: Install icestorm
+        run: |
+          mkdir icestorm
+          pushd icestorm
+          git init
+          git remote add origin https://github.com/YosysHQ/icestorm.git
+          git fetch --depth 1 origin 1a40ae75d4eebee9cce73a2c4d634fd42ed0110f
+          git reset --hard FETCH_HEAD
+          make -j$(nproc)
+          sudo make install
+          popd
+      
+      # Install nextpnr
+      - name: Install nextpnr
+        run: |
+          git clone https://github.com/YosysHQ/nextpnr.git -b nextpnr-0.6 --depth 1
+          pushd nextpnr
+          cmake -DARCH=ice40 -DCMAKE_INSTALL_PREFIX=/usr/local .
+          make -j$(nproc)
+          sudo make install
+          popd
+
+      # Install yosys
+      - name: Install yosys
+        run: |
+          git clone https://github.com/YosysHQ/yosys.git -b yosys-0.36 --depth 1
+          pushd yosys
+          make -j$(nproc)
+          sudo make install
+          popd
+
+      # Install gbdk-2020
+      - name: Install gbdk-2020
+        run: |
+          wget https://github.com/gbdk-2020/gbdk-2020/releases/download/4.2.0/gbdk-linux64.tar.gz
+          sudo tar -axvf gbdk-linux64.tar.gz -C /opt
+
+      # Build examples
+      - name: Build examples
+        run: |
+          pushd ./examples
+          make
+          popd
+

examples/Makefile

@@ -0,0 +1,18 @@
+SUBDIRS = mbc_128k_rom midi_sound_gen
+
+.PHONY: build
+build:
+	@ for d in $(SUBDIRS); do \
+		cd $$d; \
+		$(MAKE); \
+		cd ..; \
+	done
+
+.PHONY: clean
+clean:
+	@ for d in $(SUBDIRS); do \
+		cd $$d; \
+		$(MAKE) $@; \
+		cd ..; \
+	done
+