X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flog.m4;h=31a6adf89f539ff958e1ec95a395a33474cddfb6;hb=a0f402b76e57d57abd1961f20683a25d46179297;hp=d5d5664621b3ebaf12402d87022ac2a23908116d;hpb=810183441d657ca09f906ee4d916ac55a1b6127f;p=gnulib.git

diff --git a/m4/log.m4 b/m4/log.m4
index d5d566462..31a6adf89 100644
--- a/m4/log.m4
+++ b/m4/log.m4
@@ -1,5 +1,5 @@
-# log.m4 serial 3
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# log.m4 serial 4
+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.
@@ -23,6 +23,7 @@ AC_DEFUN([gl_FUNC_LOG],
 
   m4_ifdef([gl_FUNC_LOG_IEEE], [
     if test $gl_log_required = ieee && test $REPLACE_LOG = 0; then
+      AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
       AC_CACHE_CHECK([whether log works according to ISO C 99 with IEC 60559],
         [gl_cv_func_log_ieee],
         [
@@ -56,7 +57,13 @@ int main (int argc, char *argv[])
             ]])],
             [gl_cv_func_log_ieee=yes],
             [gl_cv_func_log_ieee=no],
-            [gl_cv_func_log_ieee="guessing no"])
+            [case "$host_os" in
+                       # Guess yes on glibc systems.
+               *-gnu*) gl_cv_func_log_ieee="guessing yes" ;;
+                       # If we don't know, assume the worst.
+               *)      gl_cv_func_log_ieee="guessing no" ;;
+             esac
+            ])
           LIBS="$save_LIBS"
         ])
       case "$gl_cv_func_log_ieee" in