X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fexp2l.m4;h=5d392e6b9c86ebe1844b0269130835c80157eafc;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=605cd14c76ca03241f315433240504176642f1be;hpb=aa42b5455c7a66de3882ba5870fee8abeb379498;p=gnulib.git

diff --git a/m4/exp2l.m4 b/m4/exp2l.m4
index 605cd14c7..5d392e6b9 100644
--- a/m4/exp2l.m4
+++ b/m4/exp2l.m4
@@ -1,5 +1,5 @@
-# exp2l.m4 serial 2
-dnl Copyright (C) 2010-2012 Free Software Foundation, Inc.
+# exp2l.m4 serial 3
+dnl Copyright (C) 2010-2014 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.
@@ -28,6 +28,7 @@ AC_DEFUN([gl_FUNC_EXP2L],
     AC_CHECK_DECL([exp2l], , [HAVE_DECL_EXP2L=0], [[#include <math.h>]])
     m4_ifdef([gl_FUNC_EXP2L_IEEE], [
       if test $gl_exp2l_required = ieee && test $REPLACE_EXP2L = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether exp2l works according to ISO C 99 with IEC 60559],
           [gl_cv_func_exp2l_ieee],
           [
@@ -62,7 +63,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_exp2l_ieee=yes],
               [gl_cv_func_exp2l_ieee=no],
-              [gl_cv_func_exp2l_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_exp2l_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_exp2l_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_exp2l_ieee" in