X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftruncl.m4;h=c82ae11905b911190c4f424ea219d9e4821a6a70;hb=90f065e873a354b9b2a55707ebbba64b5748b47d;hp=c4a99719a208af58e2398ffcde8907e78ae3760a;hpb=3d57d93ced65ddec292e320e35fb648dff34cd83;p=gnulib.git

diff --git a/m4/truncl.m4 b/m4/truncl.m4
index c4a99719a..c82ae1190 100644
--- a/m4/truncl.m4
+++ b/m4/truncl.m4
@@ -1,5 +1,5 @@
-# truncl.m4 serial 10
-dnl Copyright (C) 2007-2008, 2010-2011 Free Software Foundation, Inc.
+# truncl.m4 serial 11
+dnl Copyright (C) 2007-2008, 2010-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -74,6 +74,7 @@ int main()
     esac
     m4_ifdef([gl_FUNC_TRUNCL_IEEE], [
       if test $gl_truncl_required = ieee && test $REPLACE_TRUNCL = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether truncl works according to ISO C 99 with IEC 60559],
           [gl_cv_func_truncl_ieee],
           [
@@ -99,7 +100,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_truncl_ieee=yes],
               [gl_cv_func_truncl_ieee=no],
-              [gl_cv_func_truncl_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_truncl_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_truncl_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_truncl_ieee" in