X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flog10f.m4;h=e3000d0ed711a42562fff2a34d5465f33a9ccffe;hb=9f1f81e4362dd265a2fa54b30b16ceed123cd4e5;hp=e2dc60d7fe204db47532217dabab2fc01f8d1c07;hpb=6d3de8267949cc5cf4f5ff98efcd132d93a9c861;p=gnulib.git

diff --git a/m4/log10f.m4 b/m4/log10f.m4
index e2dc60d7f..e3000d0ed 100644
--- a/m4/log10f.m4
+++ b/m4/log10f.m4
@@ -1,4 +1,4 @@
-# log10f.m4 serial 4
+# log10f.m4 serial 5
 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -33,6 +33,7 @@ AC_DEFUN([gl_FUNC_LOG10F],
 
     m4_ifdef([gl_FUNC_LOG10F_IEEE], [
       if test $gl_log10f_required = ieee && test $REPLACE_LOG10F = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether log10f works according to ISO C 99 with IEC 60559],
           [gl_cv_func_log10f_ieee],
           [
@@ -66,7 +67,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_log10f_ieee=yes],
               [gl_cv_func_log10f_ieee=no],
-              [gl_cv_func_log10f_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_log10f_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_log10f_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_log10f_ieee" in