A program that I ported to linux from windows is crashing due to dynamic casting. The program works fine on windows but when run on linux, any time a dynamic_cast is encountered, it crashes. Before I do the cast, the pointer is valid, but when I try to access the new object pointer thereafter, it fails every time!

If I change it to be a static_cast, everything is ok.

I have read that RTTI is automatically turned on for linux.

Has anyone seen this before or do you know what is happening.

Cheers, Dan.

Even though dynamic_cast checks for a valid conversion and also converts references, I think I'd rather avoid inverse casts in the first place and use static_cast. Are you using dynamic_cast for the type checking for a inverse cast? If you are, then you need to be checking the result for NULL before you use it, unless you are using references, which will cause an exception if the cast is bad. If dynamic_cast is used then RTTI should be on (I think it's on by default for gcc), otherwise I wouldn't think it would compile. The bottom line is: if you aren't casting a base class pointer to a derived class pointer and want it to check to see if it's valid at runtime, you should use static_cast.
ta0kira