We have a lot of old code that contains common blocks. We have been gradually converting them to modules as it is convenient to do (and test). We have a situation where it would be very helpful - as a temporary measure - to be able to have place a common block in a module but still refer to the common variables outside of the module (blank common, in this case). It seems to work, but, since it is kind of weird thing to do, I thought I'd ask if anyone knew of any potential issues that I might not have run into yet.
For more complete information about compiler optimizations, see our Optimization Notice.