PR target/23552
	* acinclude.m4 (LIBGFOR_CHECK_FOR_BROKEN_ISFINITE): New.
	(LIBGFOR_CHECK_FOR_BROKEN_ISNAN): New.
	(LIBGFOR_CHECK_FOR_BROKEN_FPCLASSIFY): New.
	* configure.ac (LIBGFOR_CHECK_FOR_BROKEN_ISFINITE): Add use.
	(LIBGFOR_CHECK_FOR_BROKEN_ISNAN): Add use.
	(LIBGFOR_CHECK_FOR_BROKEN_FPCLASSIFY): Add use.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* libgfortan.h (isfinite): undef if broken, set if needed.
	(isnan): undef if broken, set if needed.
        (fpclassify): undef if broken, set if needed.
	* io/write.c: Remove TODO comment about working isfinite.
	* intrinsics/c99_functions.c (round): Use isfinite instead
	of fpclassify.
	* intrinsics/c99_functions.c (roundf): Ditto.

From-SVN: r104710