obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 61 insertions, 0 deletions

diff --git a/gcc/doc/implement-cxx.texi b/gcc/doc/implement-cxx.texi
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+@c Copyright (C) 2009, 2010
+@c Free Software Foundation, Inc.
+@c This is part of the GCC manual.
+@c For copying conditions, see the file gcc.texi.
+
+@node C++ Implementation
+@chapter C++ Implementation-defined behavior
+@cindex implementation-defined behavior, C++ language
+
+A conforming implementation of ISO C++ is required to document its
+choice of behavior in each of the areas that are designated
+``implementation defined''.  The following lists all such areas,
+along with the section numbers from the ISO/IEC 14822:1998 and ISO/IEC
+14822:2003 standards.  Some areas are only implementation-defined in
+one version of the standard.
+
+Some choices depend on the externally determined ABI for the platform
+(including standard character encodings) which GCC follows; these are
+listed as ``determined by ABI'' below.  @xref{Compatibility, , Binary
+Compatibility}, and @uref{http://gcc.gnu.org/readings.html}.  Some
+choices are documented in the preprocessor manual.
+@xref{Implementation-defined behavior, , Implementation-defined
+behavior, cpp, The C Preprocessor}.  Some choices are documented in
+the corresponding document for the C language.  @xref{C
+Implementation}.  Some choices are made by the library and operating
+system (or other environment when compiling for a freestanding
+environment); refer to their documentation for details.
+
+@menu
+* Conditionally-supported behavior::
+* Exception handling::
+@end menu
+
+@node Conditionally-supported behavior
+@section Conditionally-supported behavior
+
+@cite{Each implementation shall include documentation that identifies
+all conditionally-supported constructs that it does not support (C++0x
+1.4).}
+
+@itemize @bullet
+@item
+@cite{Whether an argument of class type with a non-trivial copy
+constructor or destructor can be passed to ... (C++0x 5.2.2).}
+
+Such argument passing is not supported.
+
+@end itemize
+
+@node Exception handling
+@section Exception handling
+
+@itemize @bullet
+@item
+@cite{In the situation where no matching handler is found, it is
+implementation-defined whether or not the stack is unwound before
+std::terminate() is called (C++98 15.5.1).}
+
+The stack is not unwound before std::terminate is called.
+
+@end itemize