This patch adds a unit test for the 'year2038' module. It is meant to
attract the attention of the person who builds a package with Gnulib
tests included. Useful since most packages' configure script doesn't
print a summary file regarding the result of the AC_SYS_YEAR2038
invocation.


2023-04-16  Bruno Haible  <br...@clisp.org>

        year2038: Add tests.
        * tests/test-year2038.c: New file.
        * modules/year2038-tests: New file.

============================ tests/test-year2038.c ============================
/* Test of year2038 module.
   Copyright (C) 2023 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
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <br...@clisp.org>, 2023.  */

/* This test fails if AC_SYS_YEAR2038 could not arrange for a time_t
   that supports values > 2147483647.
   This can happen
     - on systems that are not year 2038 safe, or
     - if the user specified --disable-year2038 at configure time.
   It is intended that this test fails in these circumstances.  */

#include <config.h>

#include <sys/types.h>

int
main (void)
{
  /* Check the size and sign of time_t.  */
  if (sizeof (time_t) <= 4 && (time_t)-1 < 0)
    /* time_t is only 32 bits wide and signed.  */
    return 1;

  return 0;
}
============================ modules/year2038-tests ============================
Files:
tests/test-year2038.c

Depends-on:

configure.ac:

Makefile.am:
TESTS += test-year2038
check_PROGRAMS += test-year2038




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