-@c Copyright (C) 2000, 2001, 2002, 2004, 2006, 2007, 2008 Free Software Foundation,
-@c Inc.
+@c Copyright (C) 2000, 2001, 2002, 2004, 2006, 2007, 2008, 2010
+@c Free Software Foundation, Inc.
@c This is part of the GCC manual.
@c For copying conditions, see the file gcc.texi.
@cindex C99
@cindex ISO C9X
@cindex C9X
+@cindex ISO C1X
+@cindex C1X
@cindex Technical Corrigenda
@cindex TC1
@cindex Technical Corrigendum 1
Corrigenda published in 2001, 2004 and 2007. GCC does not support the
uncorrected version.
+A fourth version of the C standard, known as @dfn{C1X}, is under
+development; GCC has limited preliminary support for parts of this
+standard, enabled with @option{-std=c1x}.
+
By default, GCC provides some extensions to the C language that on
rare occasions conflict with the C standard. @xref{C
Extensions,,Extensions to the C Language Family}. Use of the
@option{-std} options listed above will disable these extensions where
they conflict with the C standard version selected. You may also
select an extended version of the C language explicitly with
-@option{-std=gnu90} (for C90 with GNU extensions) or @option{-std=gnu99}
-(for C99 with GNU extensions). The default, if no C language dialect
+@option{-std=gnu90} (for C90 with GNU extensions), @option{-std=gnu99}
+(for C99 with GNU extensions) or @option{-std=gnu1x} (for C1X with GNU
+extensions). The default, if no C language dialect
options are given, is @option{-std=gnu90}; this will change to
@option{-std=gnu99} in some future release when the C99 support is
complete. Some features that are part of the C99 standard are
experimental C++0x mode in GCC@. The C++0x mode in GCC tracks the draft
working paper for the C++0x standard; the latest working paper is
available on the ISO C++ committee's web site at
-@uref{http://www.open-std.org/jtc1/sc22/wg21/}. For information
+@uref{http://www.open-std.org/@/jtc1/@/sc22/@/wg21/}. For information
regarding the C++0x features available in the experimental C++0x mode,
-see @uref{http://gcc.gnu.org/gcc-4.3/cxx0x_status.html}. To select this
+see @uref{http://gcc.gnu.org/projects/@/cxx0x.html}. To select this
standard in GCC, use the option @option{-std=c++0x}; to obtain all the
diagnostics required by the standard, you should also specify
@option{-pedantic} (or @option{-pedantic-errors} if you want them to be
@cindex Objective-C
@cindex Objective-C++
-There is no formal written standard for Objective-C or Objective-C++@. The most
-authoritative manual is ``Object-Oriented Programming and the
-Objective-C Language'', available at a number of web sites:
+GCC supports ``traditional'' Objective-C (also known as ``Objective-C
+1.0''), and contains support for the Objective-C exception and
+synchronization syntax. At the time of writing, it has no support for
+``Objective-C 2.0'' language extensions. GCC supports Objective-C++
+and features available in Objective-C are also available in
+Objective-C++@.
+
+GCC by default uses the GNU Objective-C runtime library, which is part
+of GCC and is not the same as the Apple/NeXT Objective-C runtime
+library used on Apple systems. There are a number of differences
+documented in this manual. The options @option{-fgnu-runtime} and
+@option{-fnext-runtime} allow you to switch between producing output
+that works with the GNU Objective-C runtime library and output that
+works with the Apple/NeXT Objective-C runtime library.
+There is no formal written standard for Objective-C or Objective-C++@.
+The authoritative manual on traditional Objective-C (1.0) is
+``Object-Oriented Programming and the Objective-C Language'',
+available at a number of web sites:
@itemize
@item
-@uref{http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/ObjectiveC/}
-is a recent (and periodically updated) version;
+@uref{http://www.gnustep.org/@/resources/@/documentation/@/ObjectivCBook.pdf}
+is the original NeXTstep document;
@item
@uref{http://objc.toodarkpark.net}
-is an older example;
+is the same document in another format;
@item
-@uref{http://www.gnustep.org}
-and
-@uref{http://gcc.gnu.org/readings.html}
-have additional useful information.
+@uref{http://developer.apple.com/@/mac/@/library/@/documentation/@/Cocoa/@/Conceptual/@/ObjectiveC/}
+has an updated version but make sure you search for ``Object Oriented Programming and the Objective-C Programming Language 1.0'',
+not documentation on the newer ``Objective-C 2.0'' language
@end itemize
+The Objective-C exception and synchronization syntax (that is, the
+keywords @@try, @@throw, @@catch, @@finally and @@synchronized) is
+fully supported by GCC and is enabled with the option
+@option{-fobjc-exceptions}. The syntax is briefly documented in this
+manual and in the Objective-C 2.0 manuals from Apple.
+
+At the time of writing, GCC supports no Objective-C 2.0 features. The
+authoritative manual on Objective-C 2.0 is available from Apple:
+@itemize
+@item
+@uref{http://developer.apple.com/@/mac/@/library/@/documentation/@/Cocoa/@/Conceptual/@/ObjectiveC/}
+@end itemize
+
+For more information concerning the history of Objective-C that is
+available online, see @uref{http://gcc.gnu.org/readings.html}
+
@xref{Top, GNAT Reference Manual, About This Guide, gnat_rm,
GNAT Reference Manual}, for information on standard
conformance and compatibility of the Ada compiler.
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