Add cross-compilation results for GNU/Hurd. * m4/calloc.m4: Add GNU/Hurd guess. * m4/cbrtl.m4: Likewise. * m4/ceil.m4: Likewise. * m4/ceilf.m4: Likewise. * m4/ceill.m4: Likewise. * m4/chown.m4: Likewise. * m4/duplocale.m4: Likewise. * m4/exp2l.m4: Likewise. * m4/expm1.m4: Likewise. * m4/fchdir.m4: Likewise. * m4/floor.m4: Likewise. * m4/floorf.m4: Likewise. * m4/fmod.m4: Likewise. * m4/fmodf.m4: Likewise. * m4/fmodl.m4: Likewise. * m4/getcwd.m4: Likewise. * m4/getgroups.m4: Likewise. * m4/gettimeofday.m4: Likewise. * m4/hypot.m4: Likewise. * m4/hypotf.m4: Likewise. * m4/hypotl.m4: Likewise. * m4/link-follow.m4: Likewise. * m4/link.m4: Likewise. * m4/linkat.m4: Likewise. * m4/log.m4: Likewise. * m4/log10.m4: Likewise. * m4/log10f.m4: Likewise. * m4/log1p.m4: Likewise. * m4/log1pf.m4: Likewise. * m4/log1pl.m4: Likewise. * m4/log2.m4: Likewise. * m4/log2f.m4: Likewise. * m4/logf.m4: Likewise. * m4/lstat.m4: Likewise. * m4/malloc.m4: Likewise. * m4/mbrlen.m4: Likewise. * m4/mbrtowc.m4: Likewise. * m4/mkdir.m4: Likewise. * m4/mkfifo.m4: Likewise. * m4/mknod.m4: Likewise. * m4/mkstemp.m4: Likewise. * m4/modf.m4: Likewise. * m4/modff.m4: Likewise. * m4/modfl.m4: Likewise. * m4/printf.m4: Likewise. * m4/pselect.m4: Likewise. * m4/ptsname.m4: Likewise. * m4/putenv.m4: Likewise. * m4/readlink.m4: Likewise. * m4/realloc.m4: Likewise. * m4/remainder.m4: Likewise. * m4/remainderf.m4: Likewise. * m4/remainderl.m4: Likewise. * m4/rmdir.m4: Likewise. * m4/round.m4: Likewise. * m4/roundf.m4: Likewise. * m4/roundl.m4: Likewise. * m4/select.m4: Likewise. * m4/setenv.m4: Likewise. * m4/signbit.m4: Likewise. * m4/sleep.m4: Likewise. * m4/stat.m4: Likewise. * m4/strerror.m4: Likewise. * m4/strtok_r.m4: Likewise. * m4/symlink.m4: Likewise. * m4/symlinkat.m4: Likewise. * m4/trunc.m4: Likewise. * m4/truncf.m4: Likewise. * m4/truncl.m4: Likewise. * m4/tzset.m4: Likewise. * m4/ungetc.m4: Likewise. * m4/usleep.m4: Likewise. * m4/wcwidth.m4: Likewise.

--- a/m4/logf.m4	Fri Dec 29 00:29:23 2017 +0100
+++ b/m4/logf.m4	Fri Dec 29 17:30:07 2017 +0100
@@ -1,4 +1,4 @@
-# logf.m4 serial 8
+# logf.m4 serial 9
 dnl Copyright (C) 2011-2017 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -68,12 +68,12 @@
               [gl_cv_func_logf_ieee=yes],
               [gl_cv_func_logf_ieee=no],
               [case "$host_os" in
-                         # Guess yes on glibc systems.
-                 *-gnu*) gl_cv_func_logf_ieee="guessing yes" ;;
-                         # Guess yes on native Windows.
-                 mingw*) gl_cv_func_logf_ieee="guessing yes" ;;
-                         # If we don't know, assume the worst.
-                 *)      gl_cv_func_logf_ieee="guessing no" ;;
+                                # Guess yes on glibc systems.
+                 *-gnu* | gnu*) gl_cv_func_logf_ieee="guessing yes" ;;
+                                # Guess yes on native Windows.
+                 mingw*)        gl_cv_func_logf_ieee="guessing yes" ;;
+                                # If we don't know, assume the worst.
+                 *)             gl_cv_func_logf_ieee="guessing no" ;;
                esac
               ])
             LIBS="$save_LIBS"