md5, sha1, sha256, sha512: add gl_SET_CRYPTO_CHECK_DEFAULT

[gnulib.git] / m4 / hypot.m4

diff --git a/m4/hypot.m4 b/m4/hypot.m4
index 52df05f..2ae3be7 100644 (file)
--- a/m4/hypot.m4
+++ b/m4/hypot.m4
@@ -1,5 +1,5 @@
-# hypot.m4 serial 3
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# hypot.m4 serial 4
+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.
@@ -17,6 +17,7 @@ AC_DEFUN([gl_FUNC_HYPOT],
 
   m4_ifdef([gl_FUNC_HYPOT_IEEE], [
     if test $gl_hypot_required = ieee && test $REPLACE_HYPOT = 0; then
+      AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
       AC_CACHE_CHECK([whether hypot works according to ISO C 99 with IEC 60559],
         [gl_cv_func_hypot_ieee],
         [
@@ -53,7 +54,13 @@ int main (int argc, char *argv[])
             ]])],
             [gl_cv_func_hypot_ieee=yes],
             [gl_cv_func_hypot_ieee=no],
-            [gl_cv_func_hypot_ieee="guessing no"])
+            [case "$host_os" in
+                       # Guess yes on glibc systems.
+               *-gnu*) gl_cv_func_hypot_ieee="guessing yes" ;;
+                       # If we don't know, assume the worst.
+               *)      gl_cv_func_hypot_ieee="guessing no" ;;
+             esac
+            ])
           LIBS="$save_LIBS"
         ])
       case "$gl_cv_func_hypot_ieee" in