tests/tcmp_d.c, tests/tcmp_ld.c, tests/tset_d.c: added explanations

of NaN-related failures in case MPFR_NANISNAN is defined.
Note: in tset_d.c, moved the NaN test before the signed-zero test
to catch the failure on the NaN first.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@5865 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 8 insertions, 2 deletions

diff --git a/tests/tcmp_ld.c b/tests/tcmp_ld.c
index 3139832aa..bfc8520ed 100644
--- a/tests/tcmp_ld.c
+++ b/tests/tcmp_ld.c
@@ -67,13 +67,16 @@ main (void)
       exit (1);
     }
 
-#ifndef MPFR_NANISNAN
   /* Check NAN */
   mpfr_clear_erangeflag ();
   c = mpfr_cmp_ld (x, DBL_NAN);
   if (c != 0 || !mpfr_erangeflag_p ())
     {
       printf ("ERROR for NAN (1)\n");
+#ifdef MPFR_NANISNAN
+      printf ("The reason is that NAN == NAN. Please look at the configure\n"
+              "output and Section \"In case of problem\" the INSTALL file.\n");
+#endif
       exit (1);
     }
   mpfr_set_nan (x);
@@ -82,9 +85,12 @@ main (void)
   if (c != 0 || !mpfr_erangeflag_p ())
     {
       printf ("ERROR for NAN (2)\n");
+#ifdef MPFR_NANISNAN
+      printf ("The reason is that NAN == NAN. Please look at the configure\n"
+              "output and Section \"In case of problem\" the INSTALL file.\n");
+#endif
       exit (1);
     }
-#endif /*MPFR_NANISNAN */
 
   mpfr_clear(x);