X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fcbrtl.m4;h=dea67e4768c049eb1d1f5d787efe67ae419bf163;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=323a5fcd28ccd960cd6013e24b01e0ee5e11011f;hpb=c5b0ffbc89d44dbe044b711e393b2e4f83f696be;p=gnulib.git

diff --git a/m4/cbrtl.m4 b/m4/cbrtl.m4
index 323a5fcd2..dea67e476 100644
--- a/m4/cbrtl.m4
+++ b/m4/cbrtl.m4
@@ -1,5 +1,5 @@
-# cbrtl.m4 serial 4
-dnl Copyright (C) 2012 Free Software Foundation, Inc.
+# cbrtl.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.
@@ -37,6 +37,7 @@ AC_DEFUN([gl_FUNC_CBRTL],
 
     m4_ifdef([gl_FUNC_CBRTL_IEEE], [
       if test $gl_cbrtl_required = ieee && test $REPLACE_CBRTL = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether cbrtl works according to ISO C 99 with IEC 60559],
           [gl_cv_func_cbrtl_ieee],
           [
@@ -70,7 +71,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_cbrtl_ieee=yes],
               [gl_cv_func_cbrtl_ieee=no],
-              [gl_cv_func_cbrtl_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_cbrtl_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_cbrtl_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_cbrtl_ieee" in