/GH (Enable _pexit Hook Function)
Calls the _pexit function at the end of every method or function.
The _pexit function is not part of any library and it is up to you to provide a definition for _pexit.
Unless you plan to explicitly call _pexit, you do not need to provide a prototype. The function must appear as if it had the following prototype, and it must push the content of all registers on entry and pop the unchanged content on exit:
void __declspec(naked) _cdecl _pexit( void );
_pexit is similar to _penter; see /Gh (Enable _penter Hook Function) for an example of how to write a _pexit function.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
Click the C/C++ folder.
Click the Command Line property page.
Type the compiler option in the Additional Options box.
To set this compiler option programmatically