X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fhypotl.m4;h=ce92bece5e89a0c89be6dc7a093ced8595ecbcd3;hb=23eecb48e39afd0d267d64d40ba6bf97aa865e13;hp=7af4cb0ef994735e7e4ca5f872acb2b92d552520;hpb=937471dbdf6a976b39d2e5f20e9817d368497e43;p=gnulib.git

diff --git a/m4/hypotl.m4 b/m4/hypotl.m4
index 7af4cb0ef..ce92bece5 100644
--- a/m4/hypotl.m4
+++ b/m4/hypotl.m4
@@ -1,5 +1,5 @@
-# hypotl.m4 serial 4
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# hypotl.m4 serial 5
+dnl Copyright (C) 2012-2013 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.
@@ -33,6 +33,7 @@ AC_DEFUN([gl_FUNC_HYPOTL],
 
     m4_ifdef([gl_FUNC_HYPOTL_IEEE], [
       if test $gl_hypotl_required = ieee && test $REPLACE_HYPOTL = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether hypotl works according to ISO C 99 with IEC 60559],
           [gl_cv_func_hypotl_ieee],
           [
@@ -69,7 +70,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_hypotl_ieee=yes],
               [gl_cv_func_hypotl_ieee=no],
-              [gl_cv_func_hypotl_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_hypotl_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_hypotl_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_hypotl_ieee" in