None.
Controls whether exception handling is enabled in the module being compiled.
When -qeh is in effect, exception handling is enabled. If your program does not use C++ structured exception handling, you can compile with -qnoeh to prevent generation of code that is not needed by your application.
-qeh
Specifying -qeh also implies -qrtti. If -qeh is specified together with -qnortti, RTTI information will still be generated as needed.
__EXCEPTIONS is predefined to 1 when -qeh is in effect; otherwise, it is undefined.