Hi, we have a lot of oracle pro*c and c programs that ran on a 64 bits. We decided to run them on a 32 bits processor and of course, we have to recompiled all of them with gcc. All compiled correctly but some created core dump on execution. We checked the core dump files and tried to find out what the problem was but we didn't have any clues. So my question is, what should we consider when compiling and executing c program that was build to run on a 64 bits processor. We try to compile with -m32 switch (gcc) without success. I mean, the problem is still there, not with compilation but on execution. Thanks for your help.

This article points out the problems when porting the code. Whilst the article is about C++ much of it is still valid(if not all), you can see future articles about the subject from their website

Other then providing general pitfalls such as the list posted by dmail we can't do much else here. I really suggest you analyze the coredump with gdb and figure it out from that.