X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmodff.m4;h=9813b61f1fe8a6dfe5fafe32106f2a64deeb3b57;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=2d4fc72d930786246f11bc723ffef1e646774616;hpb=bf6909e5ca400414ed0730b7f64e48d04993936e;p=gnulib.git

diff --git a/m4/modff.m4 b/m4/modff.m4
index 2d4fc72d9..9813b61f1 100644
--- a/m4/modff.m4
+++ b/m4/modff.m4
@@ -1,5 +1,5 @@
-# modff.m4 serial 4
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# modff.m4 serial 5
+dnl Copyright (C) 2011-2013 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.
@@ -22,6 +22,7 @@ AC_DEFUN([gl_FUNC_MODFF],
     :
     m4_ifdef([gl_FUNC_MODFF_IEEE], [
       if test $gl_modff_required = ieee && test $REPLACE_MODFF = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether modff works according to ISO C 99 with IEC 60559],
           [gl_cv_func_modff_ieee],
           [
@@ -67,7 +68,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_modff_ieee=yes],
               [gl_cv_func_modff_ieee=no],
-              [gl_cv_func_modff_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_modff_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_modff_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_modff_ieee" in