Add workflow to compile against Microchip AVR8 GNU toolchain

.github/workflows/makeall_everycpu_microchip.yml

@@ -0,0 +1,34 @@
+name: "All Arduino Microchip 3.7.0"
+on:
+  push:
+    branches:
+      - "mc"
+  workflow_dispatch:
+  schedule:
+    - cron: '0 5 * * *' # Daily at 5:00 UTC
+
+jobs:
+  build-latest:
+    runs-on: ubuntu-latest
+    container:
+      image: debian:11
+    steps:
+    - name: Install Microchip version of GCC toolchain
+      run: |
+        apt-get update
+        apt-get install -y unzip wget git make
+        mkdir -p /opt/atpack
+        cd /opt
+        wget https://ww1.microchip.com/downloads/aemDocuments/documents/DEV/ProductDocuments/SoftwareTools/avr8-gnu-toolchain-3.7.0.1796-linux.any.x86_64.tar.gz
+        tar xzfv avr8-gnu-toolchain-3.7.0.1796-linux.any.x86_64.tar.gz
+        cd /opt/atpack
+        wget http://packs.download.atmel.com/Atmel.ATmega_DFP.2.0.401.atpack
+        unzip Atmel.ATmega_DFP.2.0.401.atpack
+    - name: Checkout the repository
+      uses: actions/checkout@v3
+    - name: Make the target
+      run: |
+        cd optiboot/bootloaders/optiboot
+        export PATH="/opt/avr8-gnu-toolchain-linux_x86_64/bin/:$PATH"
+        chmod +x ./makeall.everycpu.sh
+        ./makeall.everycpu.sh

.gitignore

@@ -8,3 +8,5 @@
 /optiboot/hexfiles/* # exclude additional hexfiles
 !/optiboot/hexfiles/legacy/* # include a few legacy hexfiles
 
+# Ignore IDE files
+.vscode

optiboot/bootloaders/optiboot/Makefile

@@ -134,7 +134,7 @@ CC         = $(GCCROOT)avr-gcc
 HELPTEXT += "Option AVR_FREQ=<n>          - Clock rate of AVR CPU\n"
 
 
-override CFLAGS        = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) -DF_CPU=$(AVR_FREQ) $(DEFS)
+override CFLAGS        = -B /opt/atpack/gcc/dev/atmega328pb/ -B /opt/atpack/gcc/dev/atmega324pb/ -I /opt/atpack/include/ -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) -DF_CPU=$(AVR_FREQ) $(DEFS)
 override LDFLAGS       = $(LDSECTIONS) -Wl,--relax -nostartfiles
 
 OBJCOPY        = $(GCCROOT)avr-objcopy

optiboot/bootloaders/optiboot/makeall.everycpu.sh

@@ -1,11 +1,13 @@
-#
+#!/bin/bash
 # Makefile to make one image for each chip that optiboot supports.
 # includes Arduino, Spence Konde ATtinyCore, Hans MCUDude cores, and
 # some others.
 # this is mainly used to sanity check modifications, especially those
 # that are expected to cause "no binary changes" (you can diff the
 # resulting .hex file with a reference implementation.)
-#
+
+set -e
+set -x
 
 make clean