Revert "[libc++] [test] UNSUPPORTED my new uniform_int_distribution test on MinGW."

[• Quuxplusone]

Summary

In 5820322cb1cb9df5f05a49ed9d86984c0ac7d28d I marked this test UNSUPPORTED on MinGW to fix a CI failure, but why it fails on MinGW is still a mystery to me. Hoping @mstorsjo or somebody can help figure it out.
In that commit, I had written:

After 9fe67486cc, this test fails on MinGW for some reason.
https://buildkite.com/llvm-project/libcxx-ci/builds/7922#9e267294-441d-4b79-8a19-30fdb5599c1f
All it says in the build output is

note: command had no output on stdout or stderr
error: command failed with exit status: 4294967295

[mstorsjo]

I had a look, and it seems to run correctly when built with a recent Clang 14 snapshot. But with Clang 13.0.0 as in the CI, it crashes.

The crash backtrace looks like this:

#0  0x00007ff6a3c107f7 in __floattidf ()
#1  0x00007ff6a3c0c42a in double std::__1::accumulate<std::__1::__wrap_iter<__int128*>, double>(std::__1::__wrap_iter<__int128*>, std::__1::__wrap_iter<__int128*>, double) ()
#2  0x00007ff6a3bf3a2f in void test_statistics<__int128, std::__1::linear_congruential_engine<unsigned int, 16807u, 0u, 2147483647u> >(__int128, __int128) ()
#3  0x00007ff6a3bf3303 in void test_statistics<__int128, std::__1::linear_congruential_engine<unsigned int, 16807u, 0u, 2147483647u> >() ()
#4  0x00007ff6a3bf1526 in main ()

Therefore, I think the fix for this bug, that already is present in Clang 14, probably is this one: https://reviews.llvm.org/D110413.

So I guess if we wanted to, we could change this into XFAIL: target={{.+}}-windows-gnu && clang-13, to have the test automatically taken into use when we upgrade the CI.

[• Quuxplusone]

Superseded by D118235 — thanks @mstorsjo!

libcxx/test/std/numerics/rand/rand.dis/rand.dist.uni/rand.dist.uni.int/eval.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // REQUIRES: long_tests
-//
-// This fails on MinGW for some unknown reason.
-// UNSUPPORTED: target={{.+}}-windows-gnu
 
 // <random>
 
 // template<class _IntType = int>
 // class uniform_int_distribution
 
 // template<class _URNG> result_type operator()(_URNG& g);