This answer was close, but it resulted in canaryCage
being optimized away because it was dead code.
Solution:
NSObject+Foo.h
extern int canary;
__attribute__((constructor)) static void canaryCage() {
canary = 0;
}
NSObject+Foo.m
int canary = 0;
Unfortunately, this adds some overhead every time the category is imported, but the overhead is very minimal. If anyone knows a way to prevent canaryCage
from being stripped, I'll happily mark their answer as correct.