[wwwdocs] Document __has_attribute in /gcc-5/changes.html

[Gerald Pfeifer]

Hi Jonathan,

On Wed, 11 Mar 2015, Jonathan Wakely wrote:
> Yep, revised patch attached.

reading this update, there are some changes I'd like to suggest.

Some (or all ;-) may be disagreeable; they all stem from me
trying to understand this update.

One question: where it refers to __has_attribute returning a
date in some cases, would it make sense to provide an example
or show the format?

By the way, gcc/doc/ does not seem to contain any documentation
of this macro?  Shouldn't that be described there?

Gerald


Index: gcc-5/changes.html
===================================================================
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-5/changes.html,v
retrieving revision 1.94
diff -u -r1.94 changes.html
--- gcc-5/changes.html	6 Apr 2015 12:56:40 -0000	1.94
+++ gcc-5/changes.html	7 Apr 2015 08:33:27 -0000
@@ -253,7 +253,7 @@
         of the standard directive <code>#include</code>
         and the extension <code>#include_next</code> respectively.
     </li>
-    <li>A new built-in function-like macro to detect the existence of an
+    <li>A new built-in function-like macro to determine the existence of an
 	attribute, <code>__has_attribute</code>, has been added.
 	The equivalent built-in macro <code>__has_cpp_attribute</code> was
 	added to C++ to support
@@ -270,11 +270,11 @@
 #endif
 foo(int x);
 </pre></blockquote>
-	If an attribute exists a nonzero constant integer is returned.
+	If an attribute exists, a nonzero constant integer is returned.
 	For standardized C++ attributes a date is returned, otherwise the
 	constant returned is 1.
-	The has_attribute macros will add underscores to an attribute name
-	if necessary to resolve the name.
+	The <code>has_attribute</code> macro will add underscores to an
+	attribute name if necessary to resolve the name.
 	For C++11 and onwards the attribute may be scoped.
     </li>
     <li>A new set of built-in functions for arithmetics with overflow checking