Build failure on CentOS7 with gcc6.2

[iarspider]

Build log: fmt-6.1.2-build.log
Error message:

In file included from /mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/color.h:11:0,
                 from /mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/test/format-test.cc:26:
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h: In instantiation of ‘std::__cxx11::basic_string<_CharT> fmt::v6::internal::udl_formatter<Char, CHARS>::operator()(Args&& ...) const [with Args = {int}; Char = char; Char ...CHARS = {'{', '0', ':', '1', '0', '}'}]’:
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/test/format-test.cc:1996:3:   required from here
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:3421:77:   in constexpr expansion of ‘fmt::v6::internal::do_check_format_string<char, fmt::v6::internal::error_handler, {int}>(fmt::v6::basic_string_view<char>(((const char*)(& s)), 6ul), (fmt::v6::internal::error_handler(), fmt::v6::internal::error_handler()))’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:2620:28:   in constexpr expansion of ‘fmt::v6::internal::parse_format_string<true, char, fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>&>(s, checker)’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:2539:11:   in constexpr expansion of ‘(& handler)->fmt::v6::internal::format_string_checker<Char, ErrorHandler, Args>::on_format_specs<char, fmt::v6::internal::error_handler, {int}>((p + 1u), end)’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:2593:45:   in constexpr expansion of ‘((fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>*)this)->fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>::parse_funcs_[((fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>*)this)->fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>::arg_id_](((fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>*)this)->fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>::context_)’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:2562:21:   in constexpr expansion of ‘f.fmt::v6::formatter<T, Char, typename std::enable_if<(fmt::v6::internal::type_constant<T, Char>::value != custom_type), void>::type>::parse<fmt::v6::basic_format_parse_context<char> >(ctx)’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:2909:33:   in constexpr expansion of ‘(& ctx)->fmt::v6::basic_format_parse_context<Char, ErrorHandler>::error_handler<char, fmt::v6::internal::error_handler>()’
/mnt/build/jenkins/workspace/build/externals/fmt-6.1.2/src/fmt/6.1.2/include/fmt/format.h:3422:57: error: ‘fmt::v6::internal::format_string_checker<char, fmt::v6::internal::error_handler, int>::parse_context_type{fmt::v6::basic_string_view<char>{(((const char*)(& s)) + 3u), 3ul}, -1}’ is not a constant expression
             basic_string_view<Char>(s, sizeof...(CHARS)))
                                                         ^

[vitaut]

Should be fixed in dc22360. Thanks for reporting!