gcc/:
	* doc/cppopts.texi: Use @var when appropriate.
	* doc/extend.texi (Structure-Packing Pragmas): Likewise.
	* doc/gimple.texi (Logical Operators)
	(Adding a new GIMPLE statement code): Likewise.
	* doc/invoke.texi (Target Options, Precompiled Headers):
	Likewise.
	* doc/plugins.texi (Plugins): Likewise.

From-SVN: r168081