spdlog v1.9.1 and clang 12.0.1 (libc++) compilation failure

[btmcg]

I cannot seem to compile any code that includes spdlog with clang 12.0.1.

#include <spdlog/spdlog.h>

int
main(int /*argc*/, char** /*argv*/)
{
    spdlog::info("Welcome to spdlog!");
    return 0;
}

/usr/bin/clang++ -std=c++20 -stdlib=libc++ -ggdb3 -pedantic-errors -Wall -Werror -Wextra -O0 -DSPDLOG_COMPILED_LIB -isystem/tmp/spdlog/1.9.1/include -c main.cpp
-o main.o
In file included from main.cpp:1:
In file included from /tmp/spdlog/1.9.1/include/spdlog/spdlog.h:12:
In file included from /tmp/spdlog/1.9.1/include/spdlog/common.h:7:
In file included from /tmp/spdlog/1.9.1/include/spdlog/details/null_mutex.h:6:
In file included from /usr/bin/../include/c++/v1/atomic:579:
In file included from /usr/bin/../include/c++/v1/__threading_support:15:
In file included from /usr/bin/../include/c++/v1/chrono:829:
/usr/bin/../include/c++/v1/type_traits:1688:66: error: call to consteval function 'fmt::basic_format_string<char>::basic_format_string<fmt::basic_string_view<char>, 0>' is no
t a constant expression
    : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
                                                                 ^
/tmp/spdlog/1.9.1/include/spdlog/common.h:141:41: note: in instantiation of template class 'std::is_convertible<const fmt::basic_string_view<char> &, fmt::basic_format_string
<char>>' requested here
    : std::integral_constant<bool, std::is_convertible<const T &, fmt::format_string<>>::value || is_convertible_to_wformat_string<T>::value>
                                        ^
/tmp/spdlog/1.9.1/include/spdlog/logger.h:107:52: note: in instantiation of template class 'spdlog::is_convertible_to_basic_format_string<const fmt::basic_string_view<char> &
>' requested here
                                                  !is_convertible_to_basic_format_string<const T &>::value,
                                                   ^
/tmp/spdlog/1.9.1/include/spdlog/logger.h:109:10: note: while substituting prior template arguments into non-type template parameter [with T = fmt::basic_string_view<char>]
    void log(source_loc loc, level::level_enum lvl, const T &msg)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/spdlog/1.9.1/include/spdlog/logger.h:102:9: note: while substituting deduced template arguments into function template 'log' [with T = fmt::basic_string_view<char>, $1 =
 (no value)]
        log(loc, lvl, string_view_t{msg});
        ^
/usr/bin/../include/c++/v1/type_traits:1688:66: note: undefined constructor 'basic_format_string<fmt::basic_string_view<char>, 0>' cannot be used in a constant expression
    : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
                                                                 ^
/tmp/spdlog/1.9.1/include/spdlog/fmt/bundled/core.h:2835:17: note: declared here
  FMT_CONSTEVAL basic_format_string(const S& s) : str_(s) {
In file included from main.cpp:1:
In file included from /tmp/spdlog/1.9.1/include/spdlog/spdlog.h:12:
In file included from /tmp/spdlog/1.9.1/include/spdlog/common.h:7:
In file included from /tmp/spdlog/1.9.1/include/spdlog/details/null_mutex.h:6:
In file included from /usr/bin/../include/c++/v1/atomic:579:
In file included from /usr/bin/../include/c++/v1/__threading_support:15:
In file included from /usr/bin/../include/c++/v1/chrono:829:
/usr/bin/../include/c++/v1/type_traits:1688:66: error: call to consteval function 'fmt::basic_format_string<char>::basic_format_string<char [19], 0>' is not a constant expression
    : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
                                                                 ^
/tmp/spdlog/1.9.1/include/spdlog/common.h:141:41: note: in instantiation of template class 'std::is_convertible<char const (&)[19], fmt::basic_format_string<char>>' requested here
    : std::integral_constant<bool, std::is_convertible<const T &, fmt::format_string<>>::value || is_convertible_to_wformat_string<T>::value>
                                        ^
/tmp/spdlog/1.9.1/include/spdlog/logger.h:107:52: note: in instantiation of template class 'spdlog::is_convertible_to_basic_format_string<char const (&)[19]>' requested here
                                                  !is_convertible_to_basic_format_string<const T &>::value,
                                                   ^
/tmp/spdlog/1.9.1/include/spdlog/logger.h:109:10: note: while substituting prior template arguments into non-type template parameter [with T = char [19]]
    void log(source_loc loc, level::level_enum lvl, const T &msg)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/spdlog/1.9.1/include/spdlog/logger.h:95:9: note: while substituting deduced template arguments into function template 'log' [with T = char [19], $1 = (no value)]
        log(source_loc{}, lvl, msg);
        ^
/tmp/spdlog/1.9.1/include/spdlog/logger.h:246:9: note: in instantiation of function template specialization 'spdlog::logger::log<char [19]>' requested here
        log(level::info, msg);
        ^
/tmp/spdlog/1.9.1/include/spdlog/spdlog.h:255:27: note: in instantiation of function template specialization 'spdlog::logger::info<char [19]>' requested here
    default_logger_raw()->info(msg);
                          ^
main.cpp:7:13: note: in instantiation of function template specialization 'spdlog::info<char [19]>' requested here
    spdlog::info("Welcome to spdlog!");
            ^
/usr/bin/../include/c++/v1/type_traits:1688:66: note: undefined constructor 'basic_format_string<char [19], 0>' cannot be used in a constant expression
    : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {};
                                                                 ^
/tmp/spdlog/1.9.1/include/spdlog/fmt/bundled/core.h:2835:17: note: declared here
  FMT_CONSTEVAL basic_format_string(const S& s) : str_(s) {
                ^
2 errors generated.

spdlog was built using the following cmake command

cmake \
        -DCMAKE_BUILD_TYPE:STRING=Release \
        -DCMAKE_CXX_COMPILER:STRING=/usr/bin/clang++ \
        -DCMAKE_CXX_FLAGS:STRING="-stdlib=libc++ -rtlib=compiler-rt -fuse-ld=lld -lgcc_s" \
        -DCMAKE_INSTALL_PREFIX:PATH=/tmp/spdlog/1.9.1 \
        -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
        -DSPDLOG_BUILD_SHARED:BOOL=OFF \
        -S . -B _build

Any help would be appreciated. Thanks!

[gabime]

seems like duplicate of #2023