undefined reference to `seastar::logger::failed_to_log about seastar

[robinchrist]

Same result when cooking fmt and upgrading to 10.2.1

robin@WS-DA-7773X:/data/dev/Kataklysmos/build$ ninja
[3/3] Linking CXX executable my_app
FAILED: my_app 
: && /usr/bin/c++ -O3 -DNDEBUG  CMakeFiles/my_app.dir/src/main.cpp.o -o my_app  /data/dev/Kataklysmos/external/seastar/build/release/libseastar.a  /usr/lib/x86_64-linux-gnu/libboost_program_options.so  /usr/lib/x86_64-linux-gnu/libboost_thread.so  /usr/lib/x86_64-linux-gnu/libboost_chrono.so  /usr/lib/x86_64-linux-gnu/libboost_date_time.so  /usr/lib/x86_64-linux-gnu/libboost_atomic.so  /usr/lib/x86_64-linux-gnu/libcares.so  /data/dev/Kataklysmos/external/seastar/build/release/_cooking/installed/lib/libfmt.a  /usr/lib/x86_64-linux-gnu/liblz4.so  -ldl  /usr/lib/x86_64-linux-gnu/libgnutls.so  -latomic  /usr/lib/x86_64-linux-gnu/libsctp.so  /usr/lib/x86_64-linux-gnu/libprotobuf.so  /usr/lib/x86_64-linux-gnu/libyaml-cpp.so  /usr/lib/x86_64-linux-gnu/libhwloc.so  /usr/lib/x86_64-linux-gnu/liburing.so  /usr/lib/x86_64-linux-gnu/libnuma.so && :
/usr/bin/ld: CMakeFiles/my_app.dir/src/main.cpp.o: in function `std::_Function_handler<seastar::future<void> (), main::{lambda()#1}>::_M_invoke(std::_Any_data const&) [clone .cold]':
main.cpp:(.text.unlikely+0x40): undefined reference to `seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, seastar::internal::source_location)'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

[robinchrist]

Seems to be somehow related to boost?

./configure.py --mode=release --cook fmt --cook Boost --cook valgrind --c++-standard=20 --enable-dpdk

Works at least (with the Valgrind fix).
I haven't had the nerve to test whether removing --cook Boost will fix the issue...

[tchaikov]

@robinchrist hi Robin, so there are two issues here:

1. undefined reference to seastar::logger::failed_to_log()` with GCC
2. call to consteval function 'seastar::logger::format_info<>::format_info<char[13], 0>' is not a constant express with Clang

may i learn the version of GCC and the version of Clang which you are using? have you tried to build both you application and Seastar with Clang?

the first issue is a mysterious to me. because this symbol should be included in libseastar.a, could you paste the output of

$ nm -C build/release/libseastar.a | grep failed_to_log
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
0000000000001200 T seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)
0000000000003e50 t seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>::operator()(seastar::internal::log_buf::inserter_iterator)
0000000000003e20 t seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>::~lambda_log_writer()
00000000000012a0 t seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>::~lambda_log_writer()
00000000000000a0 d typeinfo for seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>
0000000000000079 r typeinfo name for seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>
0000000000000078 d vtable for seastar::logger::lambda_log_writer<seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)::$_0>
                 U seastar::logger::failed_to_log(std::__exception_ptr::exception_ptr, fmt::v10::basic_string_view<char>, std::source_location)

[robinchrist]

It seems like this was related to C++17?

I can't reproduce it anymore after updating Seastar (because of #2180)

What is working:

• Build with two different compilers (gcc 13.2.0 builds Seastar with C++20, Clang 16 builds the app with C++20 and vice versa, Clang 16 builds Seastar with C++20 and gcc 13.2.0 builds the app with C++20)
• Build with gcc and two different C++ versions (Seastar with C++23, app forced to C++20 via cmake - for both gcc 13.2.0)
• Build Seastar & app with Clang 16 and C++20

What is NOT working:

• Build Seastar with Clang 16 and C++23
• Build with two different compiler and C++ versions (Seastar with gcc 13.2.0 and C++23, app with Clang and C++20)

Seem like Clang 16 has some issues with C++23.

[tchaikov]

see https://github.com/scylladb/seastar/blob/master/doc/compatibility.md#compilers . we don't support Clang 16.

[robinchrist]

we don't support Clang 16.

Yeah that's not a problem. The results I posted above were merely findings with the stuff that is currently on my dev machine and as a reference for others who might run into the same issue, not a "bug report" that Clang 16 is not working 😄