count -Wunused-parameter warnings

count-unused.sh

git rev-list origin/master | perl -ne 'print if $. % 10 == 0' |
while read rev
do
  git checkout -q $rev &&
  nr="$(make -Bks CFLAGS='-Wno-all -Wunused-parameter -fdiagnostics-format=json' \ 
    git 2>&1 | grep '^\[' | jq -s 'flatten | length')" &&
  printf "%s %s\n" $(git log -1 --format="%cd" --date=unix $rev) "$nr" || return 1
done

plot-unused.py

#!/usr/bin/env python3

from datetime import datetime
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import fileinput

if __name__ == "__main__":
  timestamps, values = zip(*[line.split() for line in fileinput.input()])

  timestamps = [datetime.fromtimestamp(int(ts)) for ts in timestamps]
  values = [int(val) for val in values]

  plt.plot(timestamps, values)

  plt.ylabel("# -Wunused-parameter warnings")
  plt.title("# -Wunused-parameter warnings over time")

  plt.gcf().autofmt_xdate()
  plt.grid(True)
  plt.show()