Comment from Marco [here](https://github.com/bitcoin/bitcoin/pull/19954#discussion_r503075378):
> + make -C src --jobs=1 check-security V=1
make: Entering directory '/bitcoin/distsrc-x86_64-linux-gnu/src'
Checking binary security...
READELF=/gnu/store/pzq9s5ldl90h72p26jkdakyccdg9ib3k-profile/bin/x86_64-linux-gnu-readelf OBJDUMP=x86_64-linux-gnu-objdump OTOOL= /gnu/store/pzq9s5ldl90h72p26jkdakyccdg9ib3k-profile/bin/python3.7 ../contrib/devtools/security-check.py bitcoind  bitcoin-cli bitcoin-tx bitcoin-wallet test/test_bitcoin bench/bench_bitcoin qt/bitcoin-qt  
make: Leaving directory '/bitcoin/distsrc-x86_64-linux-gnu/src'
> + case "$HOST" in
> + make -C src --jobs=1 check-symbols V=1
make: Entering directory '/bitcoin/distsrc-x86_64-linux-gnu/src'
Checking glibc back compat...
READELF=/gnu/store/pzq9s5ldl90h72p26jkdakyccdg9ib3k-profile/bin/x86_64-linux-gnu-readelf CPPFILT=/gnu/store/pzq9s5ldl90h72p26jkdakyccdg9ib3k-profile/bin/x86_64-linux-gnu-c++filt /gnu/store/pzq9s5ldl90h72p26jkdakyccdg9ib3k-profile/bin/python3.7 ../contrib/devtools/symbol-check.py bitcoind  bitcoin-cli bitcoin-tx bitcoin-wallet test/test_bitcoin bench/bench_bitcoin qt/bitcoin-qt  
test/test_bitcoin: export of symbol in6addr_loopback not allowed
test/test_bitcoin: failed EXPORTED_SYMBOLS
make: *** [Makefile:20952: check-symbols] Error 1
make: Leaving directory '/bitcoin/distsrc-x86_64-linux-gnu/src'

**test/test_bitcoin: export of symbol in6addr_loopback not allowed**
{
    CService addr(LookupNumeric(src, 65535));
    return canon == addr.ToString();
}
BOOST_AUTO_TEST_CASE(netbase_lookupnumeric)
{
    BOOST_CHECK(TestParse("127.0.0.1", "127.0.0.1:65535"));
    BOOST_CHECK(TestParse("127.0.0.1:8333", "127.0.0.1:8333"));
    BOOST_CHECK(TestParse("::ffff:127.0.0.1", "127.0.0.1:65535"));
    BOOST_CHECK(TestParse("::", "[::]:65535"));
    BOOST_CHECK(TestParse("[::]:8333", "[::]:8333"));
    BOOST_CHECK(TestParse("[127.0.0.1]", "127.0.0.1:65535"));
    BOOST_CHECK(TestParse(":::", "[::]:0"));
    
    BOOST_CHECK(TestParse("[fd6b:88c0:8724:1:2:3:4:5]", "[::]:0"));
    
    BOOST_CHECK(TestParse("[fd6c:88c0:8724:1:2:3:4:5]", "[fd6c:88c0:8724:1:2:3:4:5]:65535"));
}
BOOST_AUTO_TEST_CASE(onioncat_test)
{
    
    CNetAddr addr1(ResolveIP("5wyqrzbvrdsumnok.onion"));
    CNetAddr addr2(ResolveIP("FD87:D87E:EB43:edb1:8e4:3588:e546:35ca"));
    BOOST_CHECK(addr1 == addr2);
    BOOST_CHECK(addr1.IsTor());
    BOOST_CHECK(addr1.ToStringIP() == "5wyqrzbvrdsumnok.onion");
    BOOST_CHECK(addr1.IsRoutable());
}
BOOST_AUTO_TEST_CASE(embedded_test)