X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-isnanl.h;h=8567f39eca139dbf66bda92ae301f7c63a0cbc1d;hb=372854e7458969151cd1ec722670f17685479b20;hp=99d624bff6d165d66aafbcbd45435ed8f315347d;hpb=e220635fc952c63b533873f2af39ec76aed4b4e3;p=gnulib.git

diff --git a/tests/test-isnanl.h b/tests/test-isnanl.h
index 99d624bff..8567f39ec 100644
--- a/tests/test-isnanl.h
+++ b/tests/test-isnanl.h
@@ -33,6 +33,16 @@
     }									     \
   while (0)
 
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zero instead.
+   Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
+   platforms, such as when cross-compiling to PowerPC on MacOS X 10.5.  */
+#if defined __hpux || defined __sgi
+long double minus_zero = -LDBL_MIN * LDBL_MIN;
+#else
+long double minus_zero = -0.0L;
+#endif
+
 int
 main ()
 {
@@ -49,7 +59,7 @@ main ()
   ASSERT (!isnanl (-2.718e30L));
   ASSERT (!isnanl (-2.718e-30L));
   ASSERT (!isnanl (0.0L));
-  ASSERT (!isnanl (-0.0L));
+  ASSERT (!isnanl (minus_zero));
   /* Infinite values.  */
   ASSERT (!isnanl (1.0L / 0.0L));
   ASSERT (!isnanl (-1.0L / 0.0L));