re PR c/20533 (documentation: attribute 'used', applied to a variable)

2006-10-01  Ryan Mansfield  <rmansfield@qnx.com>

	PR c/20533
	* doc/extend.texi: Add used variable attribute description.

From-SVN: r117349

gcc/ChangeLog

+2006-10-01  Ryan Mansfield  <rmansfield@qnx.com>
+
+	PR c/20533
+	* doc/extend.texi: Add used variable attribute description. 
+
 2006-09-30  Joseph S. Myers  <joseph@codesourcery.com>
 
 	PR c/24010

gcc/doc/extend.texi

@@ -3175,6 +3175,10 @@ This attribute, attached to a variable, means that the variable is meant
 to be possibly unused.  GCC will not produce a warning for this
 variable.
 
+@item used
+This attribute, attached to a variable, means that the variable must be
+emitted even if it appears that the variable is not referenced.
+
 @item vector_size (@var{bytes})
 This attribute specifies the vector size for the variable, measured in
 bytes.  For example, the declaration: