Script I used to generate github.com/bblanchon/predefined-macros

gcc-predefined-macros-loop.sh

export FOLDER='predefined-macros'
export VERSIONS=(4.4 4.6 4.7 4.8 4.9 5 6 7 8)

mkdir "$FOLDER"
cd "$FOLDER"

git init

for v in "${VERSIONS[@]}"; 
do
	gcc-$v -dM -E - < /dev/null | sort > gcc.h
	g++-$v -dM -E -x c++ - < /dev/null | sort > g++.h
	git add -A
	git commit -m "GCC $v"
done