Self-test failures

[dmacks]

Please use this template for reporting suspected bugs or requests for help.

Issue description

Three of the libzmp test-suites are "FAIL"

Environment

• libzmq version: 4.3.4 with PR #4478 patch with patch to ./configure for 10.10+ bug in ancient libtool (dynamic-library options)
• OS: OS X 10.13, xcode-10.1
• libsodium (1.0.18) and all other non-Apple-default tools via fink (prefix is /sw)

Minimal test code / Steps to reproduce the issue

1. export CPPFLAGS=-I/sw/include LDFLAGS=-L/sw/lib
2. ./configure --prefix=/sw --disable-silent-rules
3. /usr/bin/make
4. ulimit -n 1200; make check

What's the actual result? (include assertion message & call stack if applicable)

Nothing obviously problematic in configure process. The only configuration diagnostics that seem useful are:

checking for libbsd... no
configure: WARNING: Cannot find libbsd
[...]
configure: Building stable and legacy API (no draft API)
checking for libunwind... no
configure: WARNING: Cannot find libunwind

The compiling itself has no warnings. But then three tests fail. The test-suite.log segments are:

• FAIL: tests/test_reqrep_tcp

  WARNING: Forced closure of 4 sockets, this is an implementation error unless the test case failed
  WARNING: Forced closure of 3 sockets, this is an implementation error unless the test case failed
  WARNING: Forced closure of 4 sockets, this is an implementation error unless the test case failed
  WARNING: Forced closure of 3 sockets, this is an implementation error unless the test case failed
  tests/test_reqrep_tcp.cpp:212:test_single_connect_ipv4:PASS
  tests/test_reqrep_tcp.cpp:96:test_multi_connect_ipv4:FAIL: zmq_connect (sc, my_endpoint_3) failed, errno = 22 (Invalid argument)
  tests/test_reqrep_tcp.cpp:142:test_multi_connect_same_port_ipv4:FAIL: zmq_connect (sc0, my_endpoint_2) failed, errno = 22 (Invalid argument)
  tests/test_reqrep_tcp.cpp:215:test_single_connect_ipv6:PASS
  tests/test_reqrep_tcp.cpp:96:test_multi_connect_ipv6:FAIL: zmq_connect (sc, my_endpoint_3) failed, errno = 22 (Invalid argument)
  tests/test_reqrep_tcp.cpp:142:test_multi_connect_same_port_ipv6:FAIL: zmq_connect (sc0, my_endpoint_2) failed, errno = 22 (Invalid argument)
  -----------------------
  6 Tests 4 Failures 0 Ignored
  FAIL
  FAIL tests/test_reqrep_tcp (exit status: 4)

• FAIL: tests/test_stream_exceeds_buffer

  
  WARNING: Forced closure of 1 sockets, this is an implementation error unless the test case failed
  tests/test_stream_exceeds_buffer.cpp:47:test_stream_exceeds_buffer:FAIL: zmq_connect (zsock, my_endpoint) failed, errno = 22 (Invalid argument)

---

1 Tests 1 Failures 0 Ignored FAIL FAIL tests/test_stream_exceeds_buffer (exit status: 1)

* FAIL: tests/test_use_fd

WARNING: Forced closure of 2 sockets, this is an implementation error unless the test case failed WARNING: Forced closure of 2 sockets, this is an implementation error unless the test case failed tests/test_use_fd.cpp:64:test_req_rep_tcp:FAIL: zmq_connect (outsc, my_endpoint) failed, errno = 22 (Invalid argument) tests/test_use_fd.cpp:64:test_pair_tcp:FAIL: zmq_connect (outsc, my_endpoint) failed, errno = 22 (Invalid argument) tests/test_use_fd.cpp:205:test_client_server_tcp:PASS tests/test_use_fd.cpp:207:test_req_rep_ipc:PASS tests/test_use_fd.cpp:208:test_pair_ipc:PASS tests/test_use_fd.cpp:209:test_client_server_ipc:PASS

---

6 Tests 2 Failures 0 Ignored FAIL FAIL tests/test_use_fd (exit status: 2)

# What's the expected result?
All tests PASS (or SKIP/XFAIL as appropriate)