SPDLOG_LEVEL_NAMES error C2131: expression did not evaluate to a constant

[yalov]

win10, MSVC, c++17, spdlog 1.15.0, no external fmt,
spdlog added as add_subdirectory(spdlog) into a project.

The #define SPDLOG_LEVEL_NAMES { "TRCE", "DBUG", "INFO", "WARN", "ERRR", "CRIT", "OFF" } in the tweakme.h

creates

spdlog\common-inl.h(19): error C2131: expression did not evaluate to a constant

Also in the common-inl.h __cplusplus evaluate to 199711L,
so probably something wrong with the cmake "/Zc:__cplusplus" option. it is not.

as mentioned in the #3233

commenting the constexpr fixes the problem
or

#include <string_view>
using namespace std::literals;
#define SPDLOG_LEVEL_NAMES {"TRCE"sv, "DBUG"sv, "INFO"sv, "WARN"sv, "ERRR"sv, "CRIT"sv, "OFF"sv}

[tt4g]

PR is welcome: #3233 (comment)