threedaymonk/instructions.md

## instructions.md

      
    Raw
  

              instructions.md
            
          
    How I worked out what the Arduino IDE was doing

Wrap each avr toolchain binary with a script that spies and reports on its command line arguments:
cd arduino-1.8.13/hardware/tools/avr
mv bin bin.real
mkdir bin
cd bin
cp path/to/wrapper .
chmod +x wrapper
ls ../bin.real | xargs -n 1 -I % ln -s wrapper %

Compile, and see what happened:
cat /tmp/avr.*

The build artefacts in /tmp/arduino_build_?????? are also useful.

  
## wrapper
#!/usr/bin/env ruby
require "shellwords"

tool_name = $0.split(/\//).last
full_path = "#{__dir__}.real/#{tool_name}"
args = ARGV.shelljoin
timestamp = Time.now.utc.strftime("%H%M%S.%L")

File.open("/tmp/avr.#{timestamp}", "w") do |io|
  io.puts "#{tool_name} #{args}"
end

system(full_path + " " + args)
exit $?.exitstatus
	#!/usr/bin/env ruby
	require "shellwords"

	tool_name = $0.split(/\//).last
	full_path = "#{__dir__}.real/#{tool_name}"
	args = ARGV.shelljoin
	timestamp = Time.now.utc.strftime("%H%M%S.%L")

	File.open("/tmp/avr.#{timestamp}", "w") do \|io\|
	io.puts "#{tool_name} #{args}"
	end

	system(full_path + " " + args)
	exit $?.exitstatus