Sergey,

thanks for the patch! See my comments.

Sergey

RED OS for some reason sets `errno` to 2 ENOENT ("No such file or
directory") after the call to `mktime()`. So just skip the test for it.
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/fix-os-time-test-redos
Failed workflow: https://github.com/tarantool/tarantool/actions/runs/28585213455/job/84775371860?pr=12886#step:5:20692

Side note: The errno is set for __any__ call to the `mktime()`.

Tested inside the following Docker:

===================================================================
FROM registry.red-soft.ru/ubi8/ubi-minimal:latest

RUN dnf update -y && \
    dnf install -y cmake vim make git curl gcc g++ gdb man && \
    dnf clean all
===================================================================

| docker build . --tag redos
| docker run --network=host -ti redos bash

Then clone LuaJIT and proceed as usual.

With the patch the test skipped:
| 1..0 # SKIP RedOS incrorrect behaviour for mktime

 .../lj-1470-os-time-epoch-minus-1s.test.lua    | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
index dfe1ee11..ebfe6f22 100644
--- a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
+++ b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
@@ -1,9 +1,25 @@
 local tap = require('tap')
 
+local function detect_redos()
+  local read_file = require('utils').tools.read_file
+  local hasfile, data = pcall(read_file, '/etc/os-release')
+  if not hasfile then
+    -- Not Linux probably, so not the Red OS.
+    return false
+  else
+    return data:match('RED OS')
+  end
+end

Why do you think the problem is in RedOS, not in Glibc?

I propose skipping test for some Glibc version using CMake macro 

introduced in the following commit:

commit af0f59da76292f30ff75be1ab01458d47b226995
Author: Sergey Kaplun <skaplun@tarantool.org>
Date:   Wed Dec 4 15:03:56 2024 +0300

    test: fix LuaJIT-tests for old libc version

Otherwise, we will skip this test for always for RedOS.

in RedOS 8 glibc version is 2.36-14:

[root@pony /]# rpm -qa | grep glibc
glibc-common-2.36-14.red80.x86_64
glibc-gconv-extra-2.36-14.red80.x86_64
glibc-langpack-en-2.36-14.red80.x86_64
glibc-langpack-ru-2.36-14.red80.x86_64
glibc-2.36-14.red80.x86_64
glibc-devel-2.36-14.red80.x86_64

Also, why detect_redos() is not in utils.lua?

+
 -- The test file demonstrates os.time() fail to return -1 time
 -- value.
 -- See also: https://github.com/LuaJIT/LuaJIT/issues/1470.
-local test = tap.test('lj-1470-os-time-epoch-minus-1s')
+local test = tap.test('lj-1470-os-time-epoch-minus-1s'):skipcond({
+  -- XXX: RED OS for some reason sets `errno` to 2 ENOENT ("No
+  -- such file or directory") after the call to `mktime()`. So
+  -- just skip the test for it.
+  ['RED OS incrorrect behaviour for mktime'] = detect_redos(),
+})
 
 test:plan(1)