Wondering if this was something to do with 64bit and the iPhone5s I decided to run lipo on the binary to check it out:
Hmm, armv7 & armv7s. Had a look at the help options on class-dump-z and noticed that there was an option to select the architecture using -u. I tried the following:
class-dump-z -u armv7 Prometheus
class-dump-z -u armv7s Prometheus
Next option was to extract armv7 & armv7s from the binary using lipo as below:
lipo Prometheus -extract armv7 -output Prometheus-armv7
lipo Prometheus -extract armv7s -output Prometheus-armv7s
I then ran class-dump-z against each, for some reason the armv7 binary didn't dump...
But armv7s did which was enough for now, why it doesn't work using the -u option I'm not sure...