Mention --enable-valgrind-annotations in install.texi

	    Martin Liska  <mliska@suse.cz>

	* doc/install.texi: Mention --enable-valgrind-annotations.

Co-Authored-By: Martin Liska <mliska@suse.cz>

From-SVN: r233735

gcc/ChangeLog

+2016-02-26  Markus Trippelsdorf  <markus@trippelsdorf.de>
+	    Martin Liska  <mliska@suse.cz>
+
+	* doc/install.texi: Mention --enable-valgrind-annotations.
+
 2016-02-26  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/69551

gcc/doc/install.texi

@@ -1758,6 +1758,10 @@ When this option is specified more detailed information on memory
 allocation is gathered.  This information is printed when using
 @option{-fmem-report}.
 
+@item --enable-valgrind-annotations
+Mark selected memory related operations in the compiler when run under
+valgrind to suppress false positives.
+
 @item --enable-nls
 @itemx --disable-nls
 The @option{--enable-nls} option enables Native Language Support (NLS),