frexp, tests: work around ICC bug with -zero

* m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Compute -0.0 in a way that
works with more compilers.
* tests/minus-zero.h: New file.
* modules/ceilf-tests (Files): Include it.
* modules/ceill-tests (Files): Likewise.
* modules/floorf-tests (Files): Likewise.
* modules/floorl-tests (Files): Likewise.
* modules/frexp-nolibm-tests (Files): Likewise.
* modules/frexp-tests (Files): Likewise.
* modules/frexpl-nolibm-tests (Files): Likewise.
* modules/frexpl-tests (Files): Likewise.
* modules/isnan-tests (Files): Likewise.
* modules/isnand-nolibm-tests (Files): Likewise.
* modules/isnand-tests (Files): Likewise.
* modules/isnanf-nolibm-tests (Files): Likewise.
* modules/isnanf-tests (Files): Likewise.
* modules/isnanl-nolibm-tests (Files): Likewise.
* modules/isnanl-tests (Files): Likewise.
* modules/round-tests (Files): Likewise.
* modules/roundf-tests (Files): Likewise.
* modules/roundl-tests (Files): Likewise.
* modules/ldexpl-tests (Files): Likewise.
* modules/signbit-tests (Files): Likewise.
* modules/snprintf-posix-tests (Files): Likewise.
* modules/sprintf-posix-tests (Files): Likewise.
* modules/strtod-tests (Files): Likewise.
* modules/trunc-tests (Files): Likewise.
* modules/truncf-tests (Files): Likewise.
* modules/truncl-tests (Files): Likewise.
* modules/vsnprintf-posix-tests (Files): Likewise.
* modules/vsprintf-posix-tests (Files): Likewise.
* modules/vasnprintf-posix-tests (Files): Likewise.
* modules/vasprintf-posix-tests (Files): Likewise.
* tests/test-ceilf1.c (main): Use it.
* tests/test-ceill.c (main): Likewise.
* tests/test-floorf1.c (main): Likewise.
* tests/test-floorl.c (main): Likewise.
* tests/test-frexp.c (main): Likewise.
* tests/test-frexpl.c (main): Likewise.
* tests/test-isnan.c (main): Likewise.
* tests/test-isnand.h (main): Likewise.
* tests/test-isnanf.h (main): Likewise.
* tests/test-isnanl.h (main): Likewise.
* tests/test-ldexpl.c (main): Likewise.
* tests/test-round.c (main): Likewise.
* tests/test-roundf.c (main): Likewise.
* tests/test-roundl.c (main): Likewise.
* tests/test-signbit.c (test_signbitf, test_signbitd)
(test_signbitl): Likewise.
* tests/test-snprintf-posix.h (test_function): Likewise.
* tests/test-sprintf-posix.h (test_function): Likewise.
* tests/test-strtod.c (main): Likewise.
* tests/test-trunc1.c (main): Likewise.
* tests/test-truncf1.c (main): Likewise.
* tests/test-truncl.c (main): Likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 3 insertions, 26 deletions

diff --git a/tests/test-isnan.c b/tests/test-isnan.c
index d1d05dcea4..104aa6f076 100644
--- a/tests/test-isnan.c
+++ b/tests/test-isnan.c
@@ -29,33 +29,10 @@
 #include <float.h>
 #include <limits.h>
 
+#include "minus-zero.h"
 #include "nan.h"
 #include "macros.h"
 
-/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
-   So we use -zero instead.  */
-float zerof = 0.0f;
-
-/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
-   So we use -zero instead.  */
-double zerod = 0.0;
-
-/* 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_float (void)
 {
@@ -67,7 +44,7 @@ test_float (void)
   ASSERT (!isnan (-2.718e30f));
   ASSERT (!isnan (-2.718e-30f));
   ASSERT (!isnan (0.0f));
-  ASSERT (!isnan (-zerof));
+  ASSERT (!isnan (minus_zerof));
   /* Infinite values.  */
   ASSERT (!isnan (1.0f / 0.0f));
   ASSERT (!isnan (-1.0f / 0.0f));
@@ -107,7 +84,7 @@ test_double (void)
   ASSERT (!isnan (-2.718e30));
   ASSERT (!isnan (-2.718e-30));
   ASSERT (!isnan (0.0));
-  ASSERT (!isnan (-zerod));
+  ASSERT (!isnan (minus_zerod));
   /* Infinite values.  */
   ASSERT (!isnan (1.0 / 0.0));
   ASSERT (!isnan (-1.0 / 0.0));