X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-round2.c;h=7f3dc3f376ec31786ee16e02938f73ce1e4a6c47;hb=bbfcd2f1a92c9bdbb8d7d7d0a8a8c6665c316747;hp=cad256d11c971b0b12e7fecab6b995ad48812706;hpb=b2e2010c7c902235b5efb5bd3c6529f61b093aa4;p=gnulib.git

diff --git a/tests/test-round2.c b/tests/test-round2.c
index cad256d11..7f3dc3f37 100644
--- a/tests/test-round2.c
+++ b/tests/test-round2.c
@@ -1,5 +1,5 @@
 /* Test of rounding to nearest, breaking ties away from zero.
-   Copyright (C) 2007-2010 Free Software Foundation, Inc.
+   Copyright (C) 2007-2013 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -17,6 +17,9 @@
 /* Written by Ben Pfaff <blp@gnu.org>, 2007.
    Heavily based on code by Bruno Haible. */
 
+/* When this test fails on some platform, build it together with the gnulib
+   module 'fprintf-posix' for optimal debugging output.  */
+
 /* Get the two reference implementations of round under the names
    round_reference1 and round_reference2.
 
@@ -62,8 +65,10 @@ equal (const char *message, DOUBLE x, DOUBLE y0, DOUBLE y1)
     return true;
   else
     {
+#if GNULIB_TEST_FPRINTF_POSIX
       fprintf (stderr, "%s: "FUNCTION"(%g(%a)) = %g(%a) or %g(%a)?\n",
                message, x, x, y0, y0, y1, y1);
+#endif
       return false;
     }
 }