frozen fails on 10.6.8 Rosetta: error: modification of 'ze_map' is not a constant expression; error: non-constant condition for static assertion

[barracuda156]

:info:build [ 92%] Building CXX object tests/CMakeFiles/frozen.tests.dir/test_unordered_set.cpp.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/build/tests && /opt/local/bin/g++-mp-12  -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include -pipe -Os -std=c++14 -DNDEBUG -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -std=gnu++20 -arch ppc -mmacosx-version-min=10.6 -Wall -Wextra -Wpedantic -Werror -Wshadow -MD -MT tests/CMakeFiles/frozen.tests.dir/test_unordered_set.cpp.o -MF CMakeFiles/frozen.tests.dir/test_unordered_set.cpp.o.d -o CMakeFiles/frozen.tests.dir/test_unordered_set.cpp.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp: In function 'void C_A_T_C_H_T_E_S_T_0()':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:22:40:   in 'constexpr' expansion of 'ze_map.frozen::unordered_map<int, double, 1>::count<int>(3)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:121:17:   in 'constexpr' expansion of '((const frozen::unordered_map<int, double, 1>*)this)->frozen::unordered_map<int, double, 1>::count<int, frozen::elsa<int>, std::equal_to<int> >((* & key), (* &((const frozen::unordered_map<int, double, 1>*)this)->frozen::unordered_map<int, double, 1>::hash_function()), (* &((const frozen::unordered_map<int, double, 1>*)this)->frozen::unordered_map<int, double, 1>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:116:28:   in 'constexpr' expansion of '((const frozen::unordered_map<int, double, 1>*)this)->frozen::unordered_map<int, double, 1>::lookup<int, frozen::elsa<int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:219:23:   in 'constexpr' expansion of 'frozen::unordered_map<int, double, 1>::lookup_impl<const frozen::unordered_map<int, double, 1>&, int, frozen::elsa<int> >((*(const frozen::unordered_map<int, double, 1>*)this), (* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:214:43:   in 'constexpr' expansion of 'self.frozen::unordered_map<int, double, 1>::tables_.frozen::bits::pmh_tables<2, frozen::elsa<int> >::lookup<int, frozen::elsa<int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:22:42:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:22:42: error: modification of 'ze_map' is not a constant expression
:info:build    22 |   constexpr auto nocount = ze_map.count(3);
:info:build       |                                          ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp: In function 'void C_A_T_C_H_T_E_S_T_15()':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:180:17: error: non-constant condition for static assertion
:info:build   180 |   static_assert(!ce.count(0), "");
:info:build       |                 ^~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:180:26:   in 'constexpr' expansion of 'ce.frozen::unordered_map<unsigned int, unsigned int, 2>::count<int>(0)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:121:17:   in 'constexpr' expansion of '((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::count<int, frozen::elsa<unsigned int>, std::equal_to<unsigned int> >((* & key), (* &((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::hash_function()), (* &((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:116:28:   in 'constexpr' expansion of '((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:219:23:   in 'constexpr' expansion of 'frozen::unordered_map<unsigned int, unsigned int, 2>::lookup_impl<const frozen::unordered_map<unsigned int, unsigned int, 2>&, int, frozen::elsa<unsigned int> >((*(const frozen::unordered_map<unsigned int, unsigned int, 2>*)this), (* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:214:43:   in 'constexpr' expansion of 'self.frozen::unordered_map<unsigned int, unsigned int, 2>::tables_.frozen::bits::pmh_tables<4, frozen::elsa<unsigned int> >::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:180:17:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:180:17: error: modification of 'ce' is not a constant expression
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:181:28: error: non-constant condition for static assertion
:info:build   181 |   static_assert(ce.find(0) == ce.end(), "");
:info:build       |                 ~~~~~~~~~~~^~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:181:24:   in 'constexpr' expansion of 'ce.frozen::unordered_map<unsigned int, unsigned int, 2>::find<int>(0)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:151:16:   in 'constexpr' expansion of '((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::find<int, frozen::elsa<unsigned int>, std::equal_to<unsigned int> >((* & key), (* &((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::hash_function()), (* &((const frozen::unordered_map<unsigned int, unsigned int, 2>*)this)->frozen::unordered_map<unsigned int, unsigned int, 2>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:143:21:   in 'constexpr' expansion of 'frozen::unordered_map<unsigned int, unsigned int, 2>::find_impl<const frozen::unordered_map<unsigned int, unsigned int, 2>&, int, frozen::elsa<unsigned int>, std::equal_to<unsigned int> >((*(const frozen::unordered_map<unsigned int, unsigned int, 2>*)this), (* & key), (* & hash), (* & equal))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:195:27:   in 'constexpr' expansion of '(& self)->frozen::unordered_map<unsigned int, unsigned int, 2>::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:219:23:   in 'constexpr' expansion of 'frozen::unordered_map<unsigned int, unsigned int, 2>::lookup_impl<const frozen::unordered_map<unsigned int, unsigned int, 2>&, int, frozen::elsa<unsigned int> >((*(const frozen::unordered_map<unsigned int, unsigned int, 2>*)this), (* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_map.h:214:43:   in 'constexpr' expansion of 'self.frozen::unordered_map<unsigned int, unsigned int, 2>::tables_.frozen::bits::pmh_tables<4, frozen::elsa<unsigned int> >::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:181:28:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_map.cpp:181:28: error: modification of 'ce' is not a constant expression
:info:build [ 96%] Building CXX object tests/CMakeFiles/frozen.tests.dir/test_unordered_str_set.cpp.o
:info:build cd /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/build/tests && /opt/local/bin/g++-mp-12  -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include -pipe -Os -std=c++14 -DNDEBUG -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0 -std=gnu++20 -arch ppc -mmacosx-version-min=10.6 -Wall -Wextra -Wpedantic -Werror -Wshadow -MD -MT tests/CMakeFiles/frozen.tests.dir/test_unordered_str_set.cpp.o -MF CMakeFiles/frozen.tests.dir/test_unordered_str_set.cpp.o.d -o CMakeFiles/frozen.tests.dir/test_unordered_str_set.cpp.o -c /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_str_set.cpp
:info:build make[2]: *** [tests/CMakeFiles/frozen.tests.dir/test_unordered_map.cpp.o] Error 1
:info:build make[2]: *** Waiting for unfinished jobs....
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp: In function 'void C_A_T_C_H_T_E_S_T_0()':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:23:40:   in 'constexpr' expansion of 'ze_set.frozen::unordered_set<int, 1>::count<int>(3)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:113:17:   in 'constexpr' expansion of '((const frozen::unordered_set<int, 1>*)this)->frozen::unordered_set<int, 1>::count<int, frozen::elsa<int>, std::equal_to<int> >((* & key), (* &((const frozen::unordered_set<int, 1>*)this)->frozen::unordered_set<int, 1>::hash_function()), (* &((const frozen::unordered_set<int, 1>*)this)->frozen::unordered_set<int, 1>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:108:26:   in 'constexpr' expansion of '((const frozen::unordered_set<int, 1>*)this)->frozen::unordered_set<int, 1>::lookup<int, frozen::elsa<int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:154:32:   in 'constexpr' expansion of '((const frozen::unordered_set<int, 1>*)this)->frozen::unordered_set<int, 1>::tables_.frozen::bits::pmh_tables<2, frozen::elsa<int> >::lookup<int, frozen::elsa<int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:23:42:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:23:42: error: modification of 'ze_set' is not a constant expression
:info:build    23 |   constexpr auto nocount = ze_set.count(3);
:info:build       |                                          ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp: In function 'void C_A_T_C_H_T_E_S_T_2()':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:68:40:   in 'constexpr' expansion of 'ze_set.frozen::unordered_set<short unsigned int, 3>::count<int>(4)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:113:17:   in 'constexpr' expansion of '((const frozen::unordered_set<short unsigned int, 3>*)this)->frozen::unordered_set<short unsigned int, 3>::count<int, frozen::elsa<short unsigned int>, std::equal_to<short unsigned int> >((* & key), (* &((const frozen::unordered_set<short unsigned int, 3>*)this)->frozen::unordered_set<short unsigned int, 3>::hash_function()), (* &((const frozen::unordered_set<short unsigned int, 3>*)this)->frozen::unordered_set<short unsigned int, 3>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:108:26:   in 'constexpr' expansion of '((const frozen::unordered_set<short unsigned int, 3>*)this)->frozen::unordered_set<short unsigned int, 3>::lookup<int, frozen::elsa<short unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:154:32:   in 'constexpr' expansion of '((const frozen::unordered_set<short unsigned int, 3>*)this)->frozen::unordered_set<short unsigned int, 3>::tables_.frozen::bits::pmh_tables<8, frozen::elsa<short unsigned int> >::lookup<int, frozen::elsa<short unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:68:42:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:68:42: error: modification of 'ze_set' is not a constant expression
:info:build    68 |   constexpr auto nocount = ze_set.count(4);
:info:build       |                                          ^
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp: In function 'void C_A_T_C_H_T_E_S_T_11()':
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:159:17: error: non-constant condition for static assertion
:info:build   159 |   static_assert(!ce.count(0), "");
:info:build       |                 ^~~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:159:26:   in 'constexpr' expansion of 'ce.frozen::unordered_set<unsigned int, 2>::count<int>(0)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:113:17:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::count<int, frozen::elsa<unsigned int>, std::equal_to<unsigned int> >((* & key), (* &((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::hash_function()), (* &((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:108:26:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:154:32:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::tables_.frozen::bits::pmh_tables<4, frozen::elsa<unsigned int> >::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:159:17:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:159:17: error: modification of 'ce' is not a constant expression
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:160:28: error: non-constant condition for static assertion
:info:build   160 |   static_assert(ce.find(0) == ce.end(), "");
:info:build       |                 ~~~~~~~~~~~^~~~~~~~~~~
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:160:24:   in 'constexpr' expansion of 'ce.frozen::unordered_set<unsigned int, 2>::find<int>(0)'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:126:16:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::find<int, frozen::elsa<unsigned int>, std::equal_to<unsigned int> >((* & key), (* &((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::hash_function()), (* &((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::key_eq()))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:118:27:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/include/frozen/unordered_set.h:154:32:   in 'constexpr' expansion of '((const frozen::unordered_set<unsigned int, 2>*)this)->frozen::unordered_set<unsigned int, 2>::tables_.frozen::bits::pmh_tables<4, frozen::elsa<unsigned int> >::lookup<int, frozen::elsa<unsigned int> >((* & key), (* & hash))'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:160:28:   in 'constexpr' expansion of 'frozen::bits::seed_or_index()'
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/frozen-1.1.1/tests/test_unordered_set.cpp:160:28: error: modification of 'ce' is not a constant expression
:info:build make[2]: *** [tests/CMakeFiles/frozen.tests.dir/test_unordered_set.cpp.o] Error 1
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/build'
:info:build make[1]: *** [tests/CMakeFiles/frozen.tests.dir/all] Error 2
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_frozen/frozen/work/build'
:info:build make: *** [all] Error 2

​https://github.com/serge-sans-paille/frozen/issues/163