The behavior of some features of the C language depends on the particular C compiler used. This and related pages describe these IBM C/C++ Compilers implementation-specific dependencies.
Note: Compiling your programs with IBM C/C++ Compilers
IBM C/C++ Compilers is a stricter compiler than the XL C
compiler. See IBM C/C++
Compilers and XL C Compatibility, which discusses the issues
you should consider if you plan to use your XL C programs with
IBM C/C++ Compilers.