Xcode scheme pre-action script not running

Question

Hit build and nothing gets printed in build log. What gives?

Xcode Version 8.2.1 (8C1002)

Answer 1

Pre-action takes place before the build, so output doesn't go to the build log, it goes to stdErr. You can copy the output to a file:

exec > ${PROJECT_DIR}/prebuild.log 2>&1
echo "hello world"

To get the environment variables to work, you also need to set "Provide build settings from" to the appropriate target.

That should write hello world to a file named "prebuild.log" in your project folder.

If you want these activities to end up in the build log, consider adding a run script to your target's build phase instead.