backport: re PR libfortran/50192 (Wrong character comparision with wide strings)

backport: re PR libfortran/50192 (Wrong character comparision with wide strings)

2011-08-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	Backport from trunk
	PR libfortran/50192
	* intrinsics/string_intrinsics.c (memcmp_char4):  New function.
	* intrinsics/string_intrinsics_inc.c:  New macro MEMCMP, either
	set to memcmp or memcmp_char4.
	(compare_string):  Use MEMCMP, with correct size for it.
	* libgfortran.h:  Add prototype for memcmp_char4.

2011-08-30  Thomas Koenig  <tkoenig@gcc.gnu.org>

	Backport from trunk
	PR libfortran/50192
	* gfortran.dg/widechar_compare_1.f90:  New test.

From-SVN: r178341