X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-trunc2.c;h=c9f0d8fdd675a5d45df0f4ccad11755df705899a;hb=ea1a2077de32da9837b495d589509f8269807dd1;hp=397e1ade0d1488d1e057b29cd09fd56dc36e1f60;hpb=b2e2010c7c902235b5efb5bd3c6529f61b093aa4;p=gnulib.git

diff --git a/tests/test-trunc2.c b/tests/test-trunc2.c
index 397e1ade0..c9f0d8fdd 100644
--- a/tests/test-trunc2.c
+++ b/tests/test-trunc2.c
@@ -16,6 +16,9 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
+/* When this test fails on some platform, build it together with the gnulib
+   module 'fprintf-posix' for optimal debugging output.  */
+
 #include <config.h>
 
 #include <math.h>
@@ -123,8 +126,10 @@ check (double x)
       return 0;
     else
       {
+#if GNULIB_TEST_FPRINTF_POSIX
         fprintf (stderr, "trunc %g(%a) = %g(%a) or %g(%a)?\n",
                  x, x, reference, reference, result, result);
+#endif
         return 1;
       }
   }