Source: boost1.74 Version: 1.74.0+ds1-20 Severity: important Tags: patch When using asio, one may encounter an error when the header "boost/asio/awaitable.hpp" is used that shows that std::exchange symbol cannot be found. To reproduce this issue, one can use the daytime udp example from boost.org[1] using the following meson.build file: ,---- | project('daytime', 'cpp', | default_options : ['cpp_std=c++20']) | | boost_dep = dependency('boost') | default_cpp_args = ['-ggdb3', '-O2', '-Wall'] | | executable( | 'daytime_udp_client', | sources : 'daytime_udp_client.cpp', | cpp_args : default_cpp_args, | dependencies : [ | boost_dep | ], | ) `----
And build using "meson setup builddir && cd builddir && meson compile -v". The error message is as follows: ,---- | -*- mode: compilation; default-directory: "/sudo:root@localhost|docker:xiyueden@programming_learning_cpp_run_e19d94e6c210:/home/xiyueden/cpp/asio/daytime/builddir/" -*- | Compilation started at Mon May 22 01:49:57 | | cd builddir && meson compile -v | INFO: autodetecting backend as ninja | INFO: calculating backend command to run: /bin/ninja -v | [1/2] c++ -Idaytime_udp_client.p -I. -I.. -I/usr/include -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -std=c++20 -O0 -g -DBOOST_ALL_NO_LIB -ggdb3 -O2 -Wall -MD -MQ daytime_udp_client.p/daytime_udp_client.cpp.o -MF daytime_udp_client.p/daytime_udp_client.cpp.o.d -o daytime_udp_client.p/daytime_udp_client.cpp.o -c ../daytime_udp_client.cpp | FAILED: daytime_udp_client.p/daytime_udp_client.cpp.o | c++ -Idaytime_udp_client.p -I. -I.. -I/usr/include -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -std=c++20 -O0 -g -DBOOST_ALL_NO_LIB -ggdb3 -O2 -Wall -MD -MQ daytime_udp_client.p/daytime_udp_client.cpp.o -MF daytime_udp_client.p/daytime_udp_client.cpp.o.d -o daytime_udp_client.p/daytime_udp_client.cpp.o -c ../daytime_udp_client.cpp | In file included from /usr/include/boost/asio.hpp:23, | from ../daytime_udp_client.cpp:3: | /usr/include/boost/asio/awaitable.hpp: In constructor ‘boost::asio::awaitable<T, Executor>::awaitable(boost::asio::awaitable<T, Executor>&&)’: | /usr/include/boost/asio/awaitable.hpp:68:19: error: ‘exchange’ is not a member of ‘std’; did you mean ‘std::__atomic_impl::exchange’? | 68 | : frame_(std::exchange(other.frame_, nullptr)) | | ^~~~~~~~ | In file included from /usr/include/c++/12/bits/shared_ptr_atomic.h:33, | from /usr/include/c++/12/memory:78, | from /usr/include/boost/asio/associated_allocator.hpp:19, | from /usr/include/boost/asio.hpp:20: | /usr/include/c++/12/bits/atomic_base.h:976:7: note: ‘std::__atomic_impl::exchange’ declared here | 976 | exchange(_Tp* __ptr, _Val<_Tp> __desired, memory_order __m) noexcept | | ^~~~~~~~ | ninja: build stopped: subcommand failed. | | Compilation exited abnormally with code 1 at Mon May 22 01:49:59 `---- The GCC in use is the current in sid: ,---- | Using built-in specs. | COLLECT_GCC=gcc | COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/12/lto-wrapper | OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa | OFFLOAD_TARGET_DEFAULT=1 | Target: x86_64-linux-gnu | Configured with: ../src/configure -v --with-pkgversion='Debian 12.2.0-14' --with-bugurl=file:///usr/share/doc/gcc-12/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-12 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-12-bTRWOB/gcc-12-12.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-12-bTRWOB/gcc-12-12.2.0/debian/tmp-gcn/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu | Thread model: posix | Supported LTO compression algorithms: zlib zstd | gcc version 12.2.0 (Debian 12.2.0-14) `---- I have also tried different standard versions (11/14/17) and all shows the same error. The fix is to add "#include <utility>" in "boost/asio/awaitable.hpp". I'll attach a patch. Note that the boost1.81 package already included this fix. [1] https://www.boost.org/doc/libs/1_74_0/doc/html/boost_asio/tutorial/tutdaytime4/src.html -- System Information: Debian Release: 12.0 APT prefers testing-security APT policy: (500, 'testing-security'), (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 6.1.0-9-amd64 (SMP w/16 CPU threads; PREEMPT) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
--- /usr/include/boost/asio/awaitable.hpp 2023-01-30 09:20:12.000000000 -0800 +++ /usr/include/boost/asio/awaitable.hpp.patched 2023-05-22 01:59:49.607095861 -0700 @@ -25,6 +25,7 @@ # include <experimental/coroutine> #endif // defined(BOOST_ASIO_HAS_STD_COROUTINE) +#include <utility> #include <boost/asio/any_io_executor.hpp> #include <boost/asio/detail/push_options.hpp>