Well if there is something then shouldn't IDS put a message in the
online.log to say it
has spotted this flag?

http://www.prstech.com/src/informix_faq/ifaq08.htm

"Environment variables to set before starting Online:-

AIOTRACE=1 Writes additional message to online.log"

and

"Another one is if you are using DR and want to see what's going on
between servers set DR_TRACE=1
and pipe oninit to a file."

And what do the CCFLAGS bits mean? Any plans to tell us?