VMS Help CC, Messages, INLINESTOCLSMOD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        The <__inline or __forceinline> storage class
                modifier is a language extension and might not be
                portable.

 Description    The __inline and __forceinline storage class
                modifiers are an extension of Compaq C.  Other C
                compilers might not successfully compile a program
                that uses the extension.

 User Action    Be aware of this extension if you wish to port the
                code.