I know this has been discussed before, but I can't remember the conclusion and nothing seems to have been done, so I am going to bring it up again. Is there any way the compiler can mark object files with whether they are profiling or not, so that you cannot link a profiled object with a non-profiled one. It seems quite bad that the program appears to compile and then fails with a segmentation fault. Perhapse all profiling symbols could have "prof" appended - so they will not link against non-profiling symbols of the same name? Keean Schupke.