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In gcc/: 2010-09-28 Nicola Pero <nicola.pero@meta-innovation.com> 

In gcc/:
2010-09-28  Nicola Pero  <nicola.pero@meta-innovation.com>

        * doc/standards.texi (Standards): Expanded the section on
        Objective-C and Objective-C++.

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@ -1,3 +1,8 @@
2010-09-28 Nicola Pero <nicola.pero@meta-innovation.com>
* doc/standards.texi (Standards): Expanded the section on
Objective-C and Objective-C++.
2010-09-28 DJ Delorie <dj@redhat.com>
PR target/45800

54
gcc/doc/standards.texi
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@ -208,24 +208,54 @@ no C++ language dialect options are given, is @option{-std=gnu++98}.
@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://www.gnustep.org/@/resources/@/documentation/@/ObjectivCBook.pdf}
is the original NeXTstep document;
@item
@uref{http://objc.toodarkpark.net}
is the same document in another format;
@item
@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/}
is a recent (and periodically updated) version;
@item
@uref{http://objc.toodarkpark.net}
is an older example;
@item
@uref{http://www.gnustep.org}
and
@uref{http://gcc.gnu.org/readings.html}
have additional useful information.
@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.