Can not build Sample Project with gcc 11.2 in linux

[Maziar123]

Hi

Try Build Sample project with gcc 11.2 in linux

my sample cmakelists.txt

cmake_minimum_required(VERSION 3.20)


project(app LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED YES)
set(CMAKE_CXX_EXTENSIONS NO)

add_compile_options(-std=c++20 -fcoroutines -fconcepts)


find_package(cppcoro CONFIG REQUIRED)
add_executable(app main.cpp)
set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 20)
target_link_libraries(app PRIVATE cppcoro::cppcoro)

main.cpp

#include <cppcoro/task.hpp>
#include <cppcoro/task.hpp>
#include <cppcoro/io_service.hpp>
#include <cppcoro/read_only_file.hpp>

#include <cppcoro/filesystem.hpp>
#include <memory>
#include <algorithm>
#include <iostream>

namespace fs = cppcoro::filesystem;

cppcoro::task<std::uint64_t> count_lines(cppcoro::io_service& ioService, fs::path path)
{
  auto file = cppcoro::read_only_file::open(ioService, path);

  constexpr size_t bufferSize = 4096;
  auto buffer = std::make_unique<std::uint8_t[]>(bufferSize);

  std::uint64_t newlineCount = 0;

  for (std::uint64_t offset = 0, fileSize = file.size(); offset < fileSize;)
  {
    const auto bytesToRead = static_cast<size_t>(
      std::min<std::uint64_t>(bufferSize, fileSize - offset));

    const auto bytesRead = co_await file.read(offset, buffer.get(), bytesToRead);

    newlineCount += std::count(buffer.get(), buffer.get() + bytesRead, '\n');

    offset += bytesRead;
  }

  co_return newlineCount;
}

i get som errors :

FAILED: CMakeFiles/app.dir/main.cpp.o 
/usr/bin/c++  -isystem /home/mz/.local/include -std=c++20 -fcoroutines -fconcepts -std=c++20 -MD -MT CMakeFiles/app.dir/main.cpp.o -MF CMakeFiles/app.dir/main.cpp.o.d -o CMakeFiles/app.dir/main.cpp.o -c /mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp
In file included from /home/mz/.local/include/cppcoro/readable_file.hpp:9,
                 from /home/mz/.local/include/cppcoro/read_only_file.hpp:8,
                 from /mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:4:
/home/mz/.local/include/cppcoro/file_read_operation.hpp:97:1: error: expected declaration before ‘}’ token
   97 | }
      | ^
In file included from /home/mz/.local/include/cppcoro/read_only_file.hpp:8,
                 from /mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:4:
/home/mz/.local/include/cppcoro/readable_file.hpp:47:17: error: ‘file_read_operation’ does not name a type
   47 |                 file_read_operation read(
      |                 ^~~~~~~~~~~~~~~~~~~
/home/mz/.local/include/cppcoro/readable_file.hpp:52:17: error: ‘file_read_operation_cancellable’ does not name a type
   52 |                 file_read_operation_cancellable read(
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp: In function ‘cppcoro::task<long unsigned int> count_lines(cppcoro::io_service&, std::filesystem::__cxx11::path)’:
/mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:27:42: error: ‘class cppcoro::read_only_file’ has no member named ‘read’
   27 |     const auto bytesRead = co_await file.read(offset, buffer.get(), bytesToRead);
      |                                          ^~~~
In file included from /mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:1:
/home/mz/.local/include/cppcoro/task.hpp:52:38: error: the expression ‘cppcoro::detail::task_promise_base::final_awaitable::await_suspend<cppcoro::detail::task_promise<long unsigned int> >’ is required to be non-throwing
   52 |                                 void await_suspend(cppcoro::coroutine_handle<PROMISE> coroutine)
      |                                      ^~~~~~~~~~~~~
/home/mz/.local/include/cppcoro/task.hpp:52:38: note: must be declared with ‘noexcept(true)’
/home/mz/.local/include/cppcoro/task.hpp: In function ‘cppcoro::task<void> run(cppcoro::io_service&)’:
/home/mz/.local/include/cppcoro/task.hpp:52:38: error: the expression ‘cppcoro::detail::task_promise_base::final_awaitable::await_suspend<cppcoro::detail::task_promise<void> >’ is required to be non-throwing
/home/mz/.local/include/cppcoro/task.hpp:52:38: note: must be declared with ‘noexcept(true)’
/home/mz/.local/include/cppcoro/task.hpp: In function ‘cppcoro::task<void> process_events(cppcoro::io_service&)’:
/home/mz/.local/include/cppcoro/task.hpp:52:38: error: the expression ‘cppcoro::detail::task_promise_base::final_awaitable::await_suspend<cppcoro::detail::task_promise<void> >’ is required to be non-throwing
/home/mz/.local/include/cppcoro/task.hpp:52:38: note: must be declared with ‘noexcept(true)’
/mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp: In function ‘int main()’:
/mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:58:12: error: ‘sync_wait’ is not a member of ‘cppcoro’
   58 |   cppcoro::sync_wait(cppcoro::when_all_ready(
      |            ^~~~~~~~~
/mnt/N1/MZ/Prog/PC_CPP/Libs/cppcoro/Cppcoro_ex2/main.cpp:58:31: error: ‘when_all_ready’ is not a member of ‘cppcoro’
   58 |   cppcoro::sync_wait(cppcoro::when_all_ready(
      |                               ^~~~~~~~~~~~~~
ninja: build stopped: subcommand failed.

[andreasbuhr]

Yes, file IO is only supported on Windows right now.

[Maziar123]

But what clear way to build without File IO in Linux?

[andreasbuhr]

If you don't include any file-io files, it should work.

Otherwise, could you provide a complete CPP file which does not compile while it should?

[Maziar123]

You Can See my sample in UP! ☝️

[andreasbuhr]

You example includes read_only_file.hpp, so it is not supposed to work on Linux.