There used to be a bug when using the native compiler in compiling md4.c when compiled without either the -O or -g compiler options. We have changed the code and there is no problem under V2.1, but we do not have access to V2.0 to test and see if the problem would exist there. (We welcome feedback on this issue). There was never a problem in using GCC version 2.6.3.
In version 3.2 and beyond of the operating system, we have not seen this sort of problem with the native compiler.