X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-signbit.c;h=97f68e6a71b2d323478b07d6328d52066e6e6aca;hb=41fc74b9ab67321453d103d056a6e8eb8897042a;hp=30ba1b07e453b3ef747eca17e1f193cb6c528a63;hpb=4eb59b32a2a687c113f3c0dfc166fc2573acb84f;p=gnulib.git

diff --git a/tests/test-signbit.c b/tests/test-signbit.c
index 30ba1b07e..97f68e6a7 100644
--- a/tests/test-signbit.c
+++ b/tests/test-signbit.c
@@ -1,5 +1,5 @@
 /* Test of signbit() substitute.
-   Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2008, 2009 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
@@ -20,6 +20,7 @@
 
 #include <math.h>
 
+#include <float.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -39,9 +40,28 @@
 float zerof = 0.0f;
 double zerod = 0.0;
 long double zerol = 0.0L;
-/* We cannot use the expression '-zerol' here, because on HP-UX/hppa it
-   evaluates to 0.0L, not -0.0L.  */
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
+   So we use -zerof instead.  */
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+   So we use -zerod instead.  */
+
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zerol instead.
+   IRIX cc can't put -0.0L into .data, but can compute at runtime.
+   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
+static long double
+compute_minus_zerol (void)
+{
+  return -LDBL_MIN * LDBL_MIN;
+}
+# define minus_zerol compute_minus_zerol ()
+#else
 long double minus_zerol = -0.0L;
+#endif
 
 static void
 test_signbitf ()
@@ -144,9 +164,9 @@ test_signbitl ()
   /* Zeros.  */
   ASSERT (!signbit (0.0L));
   if (1.0L / minus_zerol < 0)
-    ASSERT (signbit (-zerol));
+    ASSERT (signbit (minus_zerol));
   else
-    ASSERT (!signbit (-zerol));
+    ASSERT (!signbit (minus_zerol));
   /* Infinite values.  */
   ASSERT (!signbit (1.0L / 0.0L));
   ASSERT (signbit (-1.0L / 0.0L));