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**
{
    BOOST_CHECK(ResolveIP("127.0.0.1").IsIPv4());
    BOOST_CHECK(ResolveIP("::FFFF:192.168.1.1").IsIPv4());
    BOOST_CHECK(ResolveIP("::1").IsIPv6());
    BOOST_CHECK(ResolveIP("10.0.0.1").IsRFC1918());
    BOOST_CHECK(ResolveIP("192.168.1.1").IsRFC1918());
    BOOST_CHECK(ResolveIP("172.31.255.255").IsRFC1918());
    BOOST_CHECK(ResolveIP("198.18.0.0").IsRFC2544());
    BOOST_CHECK(ResolveIP("198.19.255.255").IsRFC2544());
    BOOST_CHECK(ResolveIP("2001:0DB8::").IsRFC3849());
    BOOST_CHECK(ResolveIP("169.254.1.1").IsRFC3927());
    BOOST_CHECK(ResolveIP("2002::1").IsRFC3964());
    BOOST_CHECK(ResolveIP("FC00::").IsRFC4193());
    BOOST_CHECK(ResolveIP("2001::2").IsRFC4380());
    BOOST_CHECK(ResolveIP("2001:10::").IsRFC4843());
    BOOST_CHECK(ResolveIP("2001:20::").IsRFC7343());
    BOOST_CHECK(ResolveIP("FE80::").IsRFC4862());
    BOOST_CHECK(ResolveIP("64:FF9B::").IsRFC6052());
    BOOST_CHECK(ResolveIP("FD87:D87E:EB43:edb1:8e4:3588:e546:35ca").IsTor());
    BOOST_CHECK(ResolveIP("127.0.0.1").IsLocal());
    BOOST_CHECK(ResolveIP("::1").IsLocal());
    BOOST_CHECK(ResolveIP("8.8.8.8").IsRoutable());
    BOOST_CHECK(ResolveIP("2001::1").IsRoutable());
    BOOST_CHECK(ResolveIP("127.0.0.1").IsValid());
    BOOST_CHECK(CreateInternal("FD6B:88C0:8724:edb1:8e4:3588:e546:35ca").IsInternal());
    BOOST_CHECK(CreateInternal("bar.com").IsInternal());
}
bool static TestSplitHost(std::string test, std::string host, int port)