swift_compile_times_parser

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This script parses and aggregates Swift function body compile times from an Xcode build log. It can either print errors/warnings that Xcode will pick up from a Run Script build step, or tell you your worst N blocks.

Tested exclusively with Swift 2.2 and Xcode 7.3.1.

To use it, you need an Xcode build log generated by a build with a special setting: OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-function-bodies".

You'll probably also want to clean all relevant targets first.

You can create a target for use by a continuous integration server to report long compile times as errors by creating an 'aggregate' target and adding a Run Script phase like this:

# xcodebuild subprocesses to rm, which prints errors we
# don't care about at all
exec 3>&2
exec 2> /dev/null

# save log to /tmp/
LOG_PATH=`mktemp /tmp/build.log.XXXXXX` || exit 1

# call xcodebuild...from within Xcode. INCEPTION
xcodebuild \
    -workspace MyWorkspace.xcworkspace
    -scheme "My scheme" \
    -sdk iphonesimulator9.3 \  # or whatever
    OTHER_SWIFT_FLAGS="-Xfrontend -debug-time-function-bodies" \
    > $LOG_PATH

# now get our stderr back so we can print errors
exec 2>&3

# report all function body compile times >500ms as an error
/path/to/parse_swift_compile_times.py --max-time=500 $LOG_PATH

# save script return code
e=$?

# remove temp file
rm $LOG_PATH

# exit with script's return code, which will be 1 if there were errors
exit $e