Can you add custom compiler warnings in Objective-C?

Question

(I found the answer to this elsewhere while writing the question, but I thought it might be helpful to others if I posted it since I couldn't find anything here.)

I want to mark methods that need better error handling. I'd like them to show up as compiler warnings so other developers (who may be responsible for that area) will notice, and hopefully fix at their leisure.

(Other approaches welcome, I looked at __attribute__((warning)) but couldn't get it to work.)

Answer 1

It's very easy to do:

#warning Needs better error handling, please. 

Answer 2

Select your target and then select the Build Phases tab. At the bottom of the window you’ll see an option to Add Build Phase at the bottom of the screen. You can use the Add Build Phase to add a Run Script build phase. The Run Script option allows you to select a shell and execute arbitrary code against the project.

To warn about TODO & FIXME comments, use /bin/sh as the shell and paste in this script:

TAGS="TODO:|FIXME:" echo "searching ${SRCROOT} for ${TAGS}" find "${SRCROOT}" \( -name "*.h" -or -name "*.m" \) -print0 | xargs -0 egrep --with-filename --line-number --only-matching "($TAGS).*\$" | perl -p -e "s/($TAGS)/ warning: \$1/" 

Source : Generate Xcode Warnings from TODO Comments