Thanks to D-Man. I'm enclosing what I got from the gcc.gnu.org website. Yes, RH7.0 is using 2.96 gcc compiler. Not only this may produce incompatible binary codes, it also has trouble working with gdb 5.0. Gdb cannot access locally declared variables in C++ code. I was really scratching my head when I noticed that problem.
People would expect stability and high quality from commercial tools and people pay for these features. It's hard to believe Redhat use the unstable gcc 2.96 despite the very warning from the very producer. Jinsong ---------------------------------------------------------------- It has come to our attention that some GNU/Linux distributions are currently shipping with ``GCC 2.96''. We would like to point out that GCC 2.96 is not a formal GCC release nor will there ever be such a release. Rather, GCC 2.96 has been the code- name for our development branch that will eventually become GCC 3.0. Current snapshots of GCC, and any version labeled 2.96, produce object files that are not compatible with those produced by either GCC 2.95.2 or the forthcoming GCC 3.0. Therefore, programs built with these snapshots will not be compatible with any official GCC release. Actually, C and Fortran code will probably be compatible, but code in other languages, most notably C++ due to incompatibilities in symbol encoding (``mangling''), the standard library and the application binary interface (ABI), is likely to fail in some way. Static linking against C++ libraries may make a binary more portable, at the cost of increasing file size and memory use. To avoid any confusion, we have bumped the version of our current development branch to GCC 2.97. Please note that both GCC 2.96 and 2.97 are development versions; we do not recommend using them for production purposes. Binaries built using any version of GCC 2.96 or 2.97 will not be portable to systems based on one of our regular releases. If you encounter a bug in a compiler labeled 2.96, we suggest you contact whoever supplied the compiler as we can not support 2.96 versions that were not issued by the GCC team.
