# Trailing semicolons:
git grep '^#define.*;$'
git grep '^} while (0);'

# Define block (instead of do-while)
git grep '^#define.*)\s*{\s*\\\?$'
git grep -A 1 '^#define' | grep -B 1 -- '-\s*{\s*\\$'

# Unused macros:
for d in $(git grep "^#define\s*[A-Za-z_]*(" | sed 's/.*:#define\s*//' | sed 's/(.*//'); do n=$(git grep -w "$d" | wc -l); if [ $n -le 1 ]; then echo $d; fi; done | git grep -w -f - > /tmp/unused-macros.txt