test-fopen-safer: split from test-fopen

[gnulib.git] / tests / test-signbit.c

diff --git a/tests/test-signbit.c b/tests/test-signbit.c
index 1d1a2a8..97f68e6 100644 (file)
--- 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>
@@ -40,6 +41,28 @@ float zerof = 0.0f;
 double zerod = 0.0;
 long double zerol = 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 ()
 {
@@ -53,9 +76,9 @@ test_signbitf ()
   /* Zeros.  */
   ASSERT (!signbit (0.0f));
   if (1.0f / -zerof < 0)
-    ASSERT (signbit (-0.0f));
+    ASSERT (signbit (-zerof));
   else
-    ASSERT (!signbit (-0.0f));
+    ASSERT (!signbit (-zerof));
   /* Infinite values.  */
   ASSERT (!signbit (1.0f / 0.0f));
   ASSERT (signbit (-1.0f / 0.0f));
@@ -98,9 +121,9 @@ test_signbitd ()
   /* Zeros.  */
   ASSERT (!signbit (0.0));
   if (1.0 / -zerod < 0)
-    ASSERT (signbit (-0.0));
+    ASSERT (signbit (-zerod));
   else
-    ASSERT (!signbit (-0.0));
+    ASSERT (!signbit (-zerod));
   /* Infinite values.  */
   ASSERT (!signbit (1.0 / 0.0));
   ASSERT (signbit (-1.0 / 0.0));
@@ -140,10 +163,10 @@ test_signbitl ()
   ASSERT (signbit (-2.718e-30L));
   /* Zeros.  */
   ASSERT (!signbit (0.0L));
-  if (1.0L / -zerol < 0)
-    ASSERT (signbit (-0.0L));
+  if (1.0L / minus_zerol < 0)
+    ASSERT (signbit (minus_zerol));
   else
-    ASSERT (!signbit (-0.0L));
+    ASSERT (!signbit (minus_zerol));
   /* Infinite values.  */
   ASSERT (!signbit (1.0L / 0.0L));
   ASSERT (signbit (-1.0L / 0.0L));