2010-04-04  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes: (optimize_lexical_comparison): New function.
	(optimize_expr): Call it.
	(optimize_comparison): Also handle lexical comparison functions.
	Return false instad of -2 for unequal comparison.

2010-04-04  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/character_comparison_8.f90:  New test.

From-SVN: r171953