utime, futimens tests: Avoid test failure on Haiku

[Bruno Haible]

On Haiku, I see these test failures:

FAIL: test-futimens
===================

../../gltests/test-futimens.h:123: assertion 'get_stat_atime_ns (&st1) == 
get_stat_atime_ns (&st2)' failed
Abort
FAIL test-futimens (exit status: 149)

FAIL: test-utime
================

../../gltests/test-utime.c:85: assertion 'get_stat_atime_ns (&st1) == 
get_stat_atime_ns (&st2)' failed
Abort
FAIL test-utime (exit status: 149)

The cause is the particular st_atime implementation on Haiku. This patch
provides a workaround; the tests then fail later, relating to st_ctime.


2024-09-02  Bruno Haible  <br...@clisp.org>

        utime, futimens tests: Avoid test failure on Haiku.
        * tests/test-utimens-common.h (checkable_atime): On Haiku, return false.

diff --git a/tests/test-utimens-common.h b/tests/test-utimens-common.h
index f9fdb9a867..a59e65df8c 100644
--- a/tests/test-utimens-common.h
+++ b/tests/test-utimens-common.h
@@ -93,8 +93,15 @@ checkable_atime (int fd, struct stat *st)
   ASSERT (read (fd, buf, sizeof buf) == 0);
   ASSERT (fstat (fd, &st2) == 0);
   bool check_atime
+#if defined __HAIKU__
+  /* On Haiku, the st_atime field is always the current time.  It is as if 
there
+     was a daemon running (as root) that constantly reads from all files on all
+     disks at the same time.  See <https://dev.haiku-os.org/ticket/19038>.  */
+    = false;
+#else
     = (st1.st_atime != st2.st_atime
        || get_stat_atime_ns (&st1) != get_stat_atime_ns (&st2));
+#endif
   if (st)
     *st = st2;
   return check_atime;