RFA - Patch: document __OBJC__

[Nicola Pero]

This patch documents the __OBJC__ preprocessor define, which wasn't
documented anywhere.

I put it under the 'Common predefined macros' rather than the 'Standard
predefined macros' since I don't think it's required by any standard.

Ok to apply ?


Wed Jan  9 14:36:16 2002  Nicola Pero  <n.pero@mi.flashnet.it>

	* doc/cpp.texi: Document the __OBJC__ preprocess macro.


Index: cpp.texi
===================================================================
RCS file: /cvs/gcc/gcc/gcc/doc/cpp.texi,v
retrieving revision 1.21
diff -u -r1.21 cpp.texi
--- cpp.texi    2002/01/08 19:03:20     1.21
+++ cpp.texi    2002/01/09 16:35:38
@@ -1893,6 +1893,11 @@
 @noindent
 Many people find this form easier to understand.
 
+@item __OBJC__
+This macro is defined when the Objective-C compiler is in use.  You can
use
+@code{__OBJC__} to test whether a header is compiled by a C compiler
+or a Objective-C compiler.
+
 @item __GNUG__
 The GNU C++ compiler defines this.  Testing it is equivalent to
 testing @code{@w{(__GNUC__ && __cplusplus)}}.