Linkage error related to CivetServer

[D0zee]

Hi guys, trying to compile the project with the library, but getting linkage error:

#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libcivetweb-cpp.a(CivetServer.cpp.o): plugin needed to handle lto object
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libcivetweb-cpp.a(CivetServer.cpp.o): plugin needed to handle lto object
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(exposer.cc.o): in function `prometheus::Exposer::Exposer(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, CivetCallbacks const*)':
#19 109.2 exposer.cc:(.text+0x30): undefined reference to `CivetServer::CivetServer(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, CivetCallbacks const*, void const*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(exposer.cc.o): in function `prometheus::Exposer::GetListeningPorts() const':
#19 109.2 exposer.cc:(.text+0x881): undefined reference to `CivetServer::getListeningPorts()'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(endpoint.cc.o): in function `prometheus::detail::Endpoint::~Endpoint()':
#19 109.2 endpoint.cc:(.text+0x16): undefined reference to `CivetServer::removeHandler(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
#19 109.2 /usr/bin/ld: endpoint.cc:(.text+0x28): undefined reference to `CivetServer::removeAuthHandler(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(endpoint.cc.o): in function `prometheus::detail::Endpoint::RegisterAuth(std::function<bool (std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
#19 109.2 endpoint.cc:(.text+0x1ef): undefined reference to `CivetServer::addAuthHandler(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CivetAuthHandler*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(endpoint.cc.o): in function `prometheus::detail::Endpoint::Endpoint(CivetServer&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
#19 109.2 endpoint.cc:(.text+0x45a): undefined reference to `CivetServer::addHandler(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, CivetHandler*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTIN10prometheus6detail14MetricsHandlerE[_ZTIN10prometheus6detail14MetricsHandlerE]+0x10): undefined reference to `typeinfo for CivetHandler'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x28): undefined reference to `CivetHandler::handleGet(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x30): undefined reference to `CivetHandler::handlePost(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x38): undefined reference to `CivetHandler::handlePost(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x40): undefined reference to `CivetHandler::handleHead(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x48): undefined reference to `CivetHandler::handleHead(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x50): undefined reference to `CivetHandler::handlePut(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x58): undefined reference to `CivetHandler::handlePut(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x60): undefined reference to `CivetHandler::handleDelete(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x68): undefined reference to `CivetHandler::handleDelete(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x70): undefined reference to `CivetHandler::handleOptions(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x78): undefined reference to `CivetHandler::handleOptions(CivetServer*, mg_connection*, int*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x80): undefined reference to `CivetHandler::handlePatch(CivetServer*, mg_connection*)'
#19 109.2 /usr/bin/ld: vcpkg_installed/x64-linux/lib/libprometheus-cpp-pull.a(handler.cc.o):(.data.rel.ro._ZTVN10prometheus6detail14MetricsHandlerE[_ZTVN10prometheus6detail14MetricsHandlerE]+0x88): undefined reference to `CivetHandler::handlePatch(CivetServer*, mg_connection*, int*)'
#19 109.2 clang: error: linker command failed with exit code 1 (use -v to see invocation)
#19 109.2 ninja: build stopped: subcommand failed.

I use vcpkg where install the latest version and my cmake skeleton looks like:

cmake_minimum_required(VERSION 3.18)

project(Example CXX)

set(CMAKE_CXX_STANDARD 20)
...
set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)

set(SOURCES
  ...
)

set(LIBS
  prometheus-cpp::pull
  prometheus-cpp::core
  civetweb::civetweb-cpp
  civetweb::civetweb
)

# === Executable ===
add_executable(example 
    src/main.cpp
    ${SOURCES}
)

target_link_libraries(example PRIVATE ${LIBS})

# Prometheus 
find_package(prometheus-cpp REQUIRED)
find_package(civetweb REQUIRED)

Can you please help me? Tried the described actions from #639, tried to enable/disable LTO via set(CMAKE_INTERPROCEDURAL_OPTIMIZATION FALSE) but nothing helped.

[D0zee]

Update: it builds with Debug mode. But I don't understand why it doesn't with Release.

[dc6c]

Are you on Ubuntu 24.04 and using vcpkg to manage the dependencies with Clang to build your code? I have a repro case that shows that when using civetweb 1.16 installed by vcpkg, you get these link errors with Clang in release mode (or release with debug symbols), but not with GCC in release mode or Clang in debug mode: dc6c/vcpkg-civetweb-116#1.

I filed a bug with vcpkg (microsoft/vcpkg#47492), maybe it can be fixed at the port level.

[D0zee]

Are you on Ubuntu 24.04 and using vcpkg to manage the dependencies with Clang to build your code?

My ubuntu version is bookworm (probably 22.04).

Thank you for filing this bug!

[dc6c]

BTW, the way I solved it in my case was to add -fno-lto for civetweb in our custom vcpkg triplet, like this:

...
elseif(PORT MATCHES "civetweb")
  set(VCPKG_CXX_FLAGS "-fno-lto ${VCPKG_CXX_FLAGS}")
  set(VCPKG_C_FLAGS "-fno-lto ${VCPKG_C_FLAGS}")
else
...