Re: Using coroutines in ASIO

From: Richard Hodges (hodges.r_at_[hidden])
Date: 2020-04-25 23:53:00

I believe there's a fix for this about to come out in boost 1.73

Until then it will work with clang9 -fcoroutines-ts -stdlib=libc++

It's because gcc went straight to the c++20 version of coroutines without
stopping fot coroutines.ts.

On Sun, 26 Apr 2020 at 00:49, Pedro Pinto via Boost-users <
boost-users_at_[hidden]> wrote:

> Hi there, I am trying to compile the asio co-routine example but as far as
> I can tell boost is looking for an <experimental/coroutine> header that
> does not exist on my system. I am using boost 1.71 and gcc on ubuntu 20.04.
> I tried both stock gcc (v9 on ubuntu) which does not have a coroutine
> header and gcc 10 which does have it but not under the experimental
> directory.
>
> Here is the output with gcc 10:
> /usr/lib/ccache/g++   -I../../src -g   -Wall   -pedantic   -Wextra
>   -Werror   -DASIO_HAS_CO_AWAIT   -DBOOST_ASIO_HAS_CO_AWAIT   -fcoroutines
>   --std=c++2a   -fdiagnostics-color -MD -MT CMakeFiles/mcbridge.dir
> /src/main.cpp.o -MF CMakeFiles/mcbridge.dir/src/main.cpp.o.d -o
> CMakeFiles/mcbridge.dir/src/main.cpp.o -c ../../src/main.cpp
> In file included from /usr/include/boost/asio/co_spawn.hpp:22,
>                 from ../../src/main.cpp:4:
> /usr/include/boost/asio/awaitable.hpp:22:10: fatal error: experimental/coroutine:
> No such file or directory
>   22 | #include <experimental/coroutine>
>
>
>
> Any ideas on how to compile this example?
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Richard Hodges
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