Re: Cobalt link error

From: Josué Andrade Gomes (josuegomes_at_[hidden])
Date: 2023-12-23 21:17:19

Same error when building manually:

$ g++ -I~/.local/include -L~/.local/lib -o sample ../sample4.cpp
-std=c++20 -fcoroutines -lboost_system
/usr/bin/ld: /tmp/ccr6j1MG.o: in function `co_main(co_main(int,
char**)::_Z7co_mainiPPc.Frame*) [clone .actor]':
sample4.cpp:(.text+0x2a9): undefined reference to
`boost::cobalt::detail::main_promise::final_suspend()'
/usr/bin/ld: /tmp/ccr6j1MG.o: in function
`main::reset_res::operator()(std::pmr::memory_resource*)':
sample4.cpp:(.text._ZZ4mainEN9reset_resclEPNSt3pmr15memory_resourceE[_ZZ4mainEN9reset_resclEPNSt3pmr15memory_resourceE]+0x1c):
undefined reference to
`boost::cobalt::this_thread::set_default_resource(std::pmr::memory_resource*)'
/usr/bin/ld: /tmp/ccr6j1MG.o: in function `main':
sample4.cpp:(.text.main[main]+0x5b): undefined reference to
`boost::cobalt::this_thread::set_default_resource(std::pmr::memory_resource*)'
/usr/bin/ld: sample4.cpp:(.text.main[main]+0xc2): undefined reference
to `boost::cobalt::detail::main_promise::run_main(boost::cobalt::main)'
/usr/bin/ld: /tmp/ccr6j1MG.o: in function `bool
boost::cobalt::detail::promise_receiver<void>::awaitable::await_suspend<boost::cobalt::detail::fork::promise_type>(std::__n4861::coroutine_handle<boost::cobalt::detail::fork::promise_type>)':
sample4.cpp:(.text._ZN5boost6cobalt6detail16promise_receiverIvE9awaitable13await_suspendINS1_4fork12promise_typeEEEbNSt7__n486116coroutine_handleIT_EE[_ZN5boost6cobalt6detail16promise_receiverIvE9awaitable13await_suspendINS1_4fork12promise_typeEEEbNSt7__n486116coroutine_handleIT_EE]+0x7f):
undefined reference to `boost::cobalt::detail::already_awaited()'
/usr/bin/ld: /tmp/ccr6j1MG.o: in function
`boost::cobalt::detail::promise_receiver<void>::awaitable::interrupt_await()
&':
sample4.cpp:(.text._ZNR5boost6cobalt6detail16promise_receiverIvE9awaitable15interrupt_awaitEv[_ZNR5boost6cobalt6detail16promise_receiverIvE9awaitable15interrupt_awaitEv]+0x33):
undefined reference to `boost::cobalt::detail::detached_exception()'
collect2: error: ld returned 1 exit status

Em sáb., 23 de dez. de 2023 às 05:22, accelerator0099 via Boost-users
<boost-users_at_[hidden]> escreveu:
>
> CMake doesn't support cobalt (even the latest cmake 3.28.1 doesn't
> support it).
>
> On 12/21/23 22:29, Josué Andrade Gomes via Boost-users wrote:
> > cmake_minimum_required(VERSION 3.20)
> > project(coro_study)
> >
> > set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
> > set(CMAKE_CXX_STANDARD 20)
> > set(CMAKE_VERBOSE_MAKEFILE ON)
> >
> > set(Boost_VERBOSE 1)
> > set(Boost_DEBUG 1)
> >
> > find_package(Boost REQUIRED COMPONENTS system)
> >
> > add_executable(sample sample.cpp)
> >
> > target_include_directories(sample4 PRIVATE ${Boost_INCLUDE_DIRS})
> > target_link_libraries(sample4 PRIVATE ${Boost_LIBRARIES})
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