Dumb Preprocessor Defines

dump_defines.sh

#!/bin/bash

# Use as `./dump_defines.sh $CC`, where CC is the C or C++
# compiler desired. There must be an arg1, or the script
# will quit.

if [ "$#" -ne 1 ]; then
    echo "Use: ./dump_defines.sh \$CC."
    echo "Must invoke with exactly 1 arg."
    exit 1
fi

$1 -dM -E - < /dev/null