/sys$common/syshlp/helplib.hlb CC, Messages, ARGADDR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> taking the address of the constant
                expression "<expression>" in an argument list is a
                language extension.

 Description    The Compaq C compiler will allow the address of a
                constant to be passed as an argument to a function
                call.  This is an extension to standard C.  Other C
                compilers might not successfully compile a program
                that uses this extension.

 User Action    Assign the constant to a variable, and pass the
                address of the variable.