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, 5 insertions, 8 deletions

diff --git a/tests/test-strtod.c b/tests/test-strtod.c
index e1d04af3b9..261761006d 100644
--- a/tests/test-strtod.c
+++ b/tests/test-strtod.c
@@ -28,15 +28,12 @@ SIGNATURE_CHECK (strtod, double, (char const *, char **));
 #include <string.h>
 
 #include "isnand-nolibm.h"
+#include "minus-zero.h"
 #include "macros.h"
 
 /* Avoid requiring -lm just for fabs.  */
 #define FABS(d) ((d) < 0.0 ? -(d) : (d))
 
-/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
-   So we use -zero instead.  */
-double zero = 0.0;
-
 int
 main (void)
 {
@@ -312,7 +309,7 @@ main (void)
     errno = 0;
     result = strtod (input, &ptr);
     ASSERT (result == 0.0);
-    ASSERT (!!signbit (result) == !!signbit (-zero)); /* IRIX 6.5, OSF/1 4.0 */
+    ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* IRIX 6.5, OSF/1 4.0 */
     ASSERT (ptr == input + 2);
     ASSERT (errno == 0);
   }
@@ -407,7 +404,7 @@ main (void)
     errno = 0;
     result = strtod (input, &ptr);
     ASSERT (result == 0.0);
-    ASSERT (!!signbit (result) == !!signbit (-zero)); /* MacOS X 10.3, FreeBSD 6.2, IRIX 6.5, OSF/1 4.0 */
+    ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* MacOS X 10.3, FreeBSD 6.2, IRIX 6.5, OSF/1 4.0 */
     ASSERT (ptr == input + 2);          /* glibc-2.3.6, MacOS X 10.3, FreeBSD 6.2, AIX 7.1 */
     ASSERT (errno == 0);
   }
@@ -553,7 +550,7 @@ main (void)
        0 on negative underflow, even though quality of implementation
        demands preserving the sign.  Disable this test until fixed
        glibc is more prevalent.  */
-    ASSERT (!!signbit (result) == !!signbit (-zero)); /* glibc-2.3.6, mingw */
+    ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* glibc-2.3.6, mingw */
 #endif
     ASSERT (ptr == input + 10);
     ASSERT (errno == ERANGE);
@@ -972,7 +969,7 @@ main (void)
         errno = 0;
         result = strtod (input, &ptr);
         ASSERT (result == 0.0);
-        ASSERT (!!signbit (result) == !!signbit (-zero)); /* IRIX 6.5, OSF/1 4.0 */
+        ASSERT (!!signbit (result) == !!signbit (minus_zerod)); /* IRIX 6.5, OSF/1 4.0 */
         ASSERT (ptr == input + m);
         ASSERT (errno == 0);
       }