A clever post from deallocatedobjects cropped up on IRC on Friday, and I thought I'd share its wisdom. The post discusses how you can add a custom build phase to automatically show TODO and FIXME comments as warnings in your Xcode 4 (and later) projects.
It takes very little work. Select a target and choose Editor > Add Build Phase > Add Run Script Build Phase. Paste the following bash script in:
KEYWORDS="TODO:|FIXME:|\?\?\?:|\!\!\!:"
find "${SRCROOT}" \( -name "*.h" -or -name "*.m" \) -print0 | xargs -0 egrep --with-filename --line-number --only-matching "($KEYWORDS).*\$" | perl -
