1@c Copyright (C) 2009-2013 Free Software Foundation, Inc. 2@c This is part of the GCC manual. 3@c For copying conditions, see the file gcc.texi. 4 5@node C++ Implementation 6@chapter C++ Implementation-defined behavior 7@cindex implementation-defined behavior, C++ language 8 9A conforming implementation of ISO C++ is required to document its 10choice of behavior in each of the areas that are designated 11``implementation defined''. The following lists all such areas, 12along with the section numbers from the ISO/IEC 14882:1998 and ISO/IEC 1314882:2003 standards. Some areas are only implementation-defined in 14one version of the standard. 15 16Some choices depend on the externally determined ABI for the platform 17(including standard character encodings) which GCC follows; these are 18listed as ``determined by ABI'' below. @xref{Compatibility, , Binary 19Compatibility}, and @uref{http://gcc.gnu.org/readings.html}. Some 20choices are documented in the preprocessor manual. 21@xref{Implementation-defined behavior, , Implementation-defined 22behavior, cpp, The C Preprocessor}. Some choices are documented in 23the corresponding document for the C language. @xref{C 24Implementation}. Some choices are made by the library and operating 25system (or other environment when compiling for a freestanding 26environment); refer to their documentation for details. 27 28@menu 29* Conditionally-supported behavior:: 30* Exception handling:: 31@end menu 32 33@node Conditionally-supported behavior 34@section Conditionally-supported behavior 35 36@cite{Each implementation shall include documentation that identifies 37all conditionally-supported constructs that it does not support (C++0x 381.4).} 39 40@itemize @bullet 41@item 42@cite{Whether an argument of class type with a non-trivial copy 43constructor or destructor can be passed to ... (C++0x 5.2.2).} 44 45Such argument passing is not supported. 46 47@end itemize 48 49@node Exception handling 50@section Exception handling 51 52@itemize @bullet 53@item 54@cite{In the situation where no matching handler is found, it is 55implementation-defined whether or not the stack is unwound before 56std::terminate() is called (C++98 15.5.1).} 57 58The stack is not unwound before std::terminate is called. 59 60@end itemize 61