building cppcoro failed (undefined reference to __cxa_end_catch/__cxa_begin_catch)

[whoisdavidvu]

Hi Andreas, i just tried to build cppcoro but the build failed for me with a lot of "undefinded reference" errors and i was wondering if you can help me build it successfully.

Example:

/usr/bin/ld: /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/test/single_consumer_async_auto_reset_event_tests.cpp:40: undefined reference to '__cxa_begin_catch'
/usr/bin/ld: /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/test/single_consumer_async_auto_reset_event_tests.cpp:40: undefined reference to '__cxa_end_catch'

The following targets failed to build:
- build/linux_x64_clang11.0.0_debug/test/run
- build/linux_x64_clang11.0.0_optimised/test/run

[andreasbuhr]

Hi, how did you configure it? I see you are using Clang 11. Could you please try the following:

  cmake \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_CXX_STANDARD=20 \
    -DBUILD_TESTING=ON \
    -DCMAKE_CXX_FLAGS=-stdlib=libc++ \
    -DCMAKE_EXE_LINKER_FLAGS=-lc++ \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    ../path/to/cppcoro

Does it help?

[whoisdavidvu]

Hi, i didn't configure anything, i just used cake without any parameters.

I tried the cmake you posted and it wouldn't compile either, i uploaded the log files down below.

CMakeError.log
CMakeOutput.log

[andreasbuhr]

Thanks for your feedback.
The options I suggested above are the right options for using clang, but from your output I see CMake selected the system compiler, which is gcc probably.
Could you please try exporting which C++ compiler should be used first? Could you try the following?

export CXX=clang-11
cmake \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_CXX_STANDARD=20 \
    -DBUILD_TESTING=ON \
    -DCMAKE_CXX_FLAGS=-stdlib=libc++ \
    -DCMAKE_EXE_LINKER_FLAGS=-lc++ \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    ../path/to/cppcoro

Or, alternatively, to use it with gcc, do not export anything, but also do not specify the flags:

cmake \
    -DCMAKE_BUILD_TYPE=Debug \
    -DCMAKE_CXX_STANDARD=20 \
    -DBUILD_TESTING=ON \
    -DCMAKE_VERBOSE_MAKEFILE=ON \
    ../path/to/cppcoro

Does any of these work?

[whoisdavidvu]

I just tried the first code that you sent, but it didn't work aswell. I will upload the created logs down below.

CMakeError.log
CMakeOutput.log

Then i tried
export CXX=gcc-10
before trying the second block of code, and it also did not work.

CMakeError.log
CMakeOutput.log

If it helps, the terminal outputs this:

-- The CXX compiler identification is GNU 10.2.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- broken
CMake Error at /usr/share/cmake-3.16/Modules/CMakeTestCXXCompiler.cmake:53 (message):
  The C++ compiler

    "/usr/bin/c++"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/bin/gmake cmTC_dcd90/fast && /usr/bin/gmake -f CMakeFiles/cmTC_dcd90.dir/build.make CMakeFiles/cmTC_dcd90.dir/build
    gmake[1]: Entering directory '/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_dcd90.dir/testCXXCompiler.cxx.o
    /usr/bin/c++    -stdlib=libc++    -std=gnu++2a -o CMakeFiles/cmTC_dcd90.dir/testCXXCompiler.cxx.o -c /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
    c++: error: unrecognized command-line option ‘-stdlib=libc++’
    gmake[1]: *** [CMakeFiles/cmTC_dcd90.dir/build.make:66: CMakeFiles/cmTC_dcd90.dir/testCXXCompiler.cxx.o] Error 1
    gmake[1]: Leaving directory '/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeTmp'
    gmake: *** [Makefile:121: cmTC_dcd90/fast] Error 2
    
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:2 (project)


-- Configuring incomplete, errors occurred!
See also "/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeOutput.log".
See also "/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/CMakeFiles/CMakeError.log".

[andreasbuhr]

You need to clean your build directory before you change the configuration, otherwise CMake will cache settings.

You also should use out-of-source builds, see below.

Please try the following:

mkdir cppcoro
cd cppcoro
git clone https://github.com/andreasbuhr/cppcoro.git
mkdir cppcoro_gccbuild
cd cppcoro_gccbuild
export CXX=g++-10
cmake  -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_STANDARD=20  -DBUILD_TESTING=ON -DCMAKE_VERBOSE_MAKEFILE=ON ../cppcoro
cmake --build .

cd ..
mkdir cppcoro_clangbuild
cd cppcoro_clangbuild
export CXX=clang++-11
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_STANDARD=20 -DBUILD_TESTING=ON -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DCMAKE_EXE_LINKER_FLAGS=-lc++ -DCMAKE_VERBOSE_MAKEFILE=ON ../cppcoro

[whoisdavidvu]

I just tried the upper cmake building the cppcoro in cppcoro_gccbuild and it seemed to build without any errors, whereas building the content for the clangbuild folder threw errors again. Is the build by the gcc compiler seen as a success? Or does it need to be built by clang?

-- The CXX compiler identification is Clang 11.0.0
-- Check for working CXX compiler: /usr/bin/clang++-11
-- Check for working CXX compiler: /usr/bin/clang++-11 -- broken
CMake Error at /usr/share/cmake-3.16/Modules/CMakeTestCXXCompiler.cmake:53 (message):
  The C++ compiler

    "/usr/bin/clang++-11"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/bin/gmake cmTC_27289/fast && /usr/bin/gmake -f CMakeFiles/cmTC_27289.dir/build.make CMakeFiles/cmTC_27289.dir/build
    gmake[1]: Entering directory '/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeTmp'
    Building CXX object CMakeFiles/cmTC_27289.dir/testCXXCompiler.cxx.o
    /usr/bin/clang++-11    -stdlib=libc++    -std=gnu++2a -o CMakeFiles/cmTC_27289.dir/testCXXCompiler.cxx.o -c /home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
    Linking CXX executable cmTC_27289
    /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_27289.dir/link.txt --verbose=1
    /usr/bin/clang++-11  -stdlib=libc++   -lc++  CMakeFiles/cmTC_27289.dir/testCXXCompiler.cxx.o  -o cmTC_27289 
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_free_exception'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_begin_catch'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_guard_release'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_pure_virtual'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_allocate_exception'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__gxx_personality_v0'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_throw'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_guard_abort'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_end_catch'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_guard_acquire'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `vtable for __cxxabiv1::__vmi_class_type_info'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `vtable for __cxxabiv1::__class_type_info'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `__cxa_rethrow'
    /usr/bin/ld: /usr/local/lib/libc++.so: undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    gmake[1]: *** [CMakeFiles/cmTC_27289.dir/build.make:87: cmTC_27289] Error 1
    gmake[1]: Leaving directory '/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeTmp'
    gmake: *** [Makefile:121: cmTC_27289/fast] Error 2
    
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:2 (project)


-- Configuring incomplete, errors occurred!
See also "/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeOutput.log".
See also "/home/davidvu/C++/projects/firstarray_randomgen/cppcoro/cppcoro_clangbuild/CMakeFiles/CMakeError.log".

[erikzenker]

I also do net get clang 11 working. Same error as above.
When I just try configure with clang 11. I get the following error:

CMake Error at cmake/FindCoroutines.cmake:272 (message):
  Cannot compile simple program using std::coroutines.  Is C++17 or later
  activated?
Call Stack (most recent call first):
  lib/CMakeLists.txt:172 (find_package)

When I try to add the cxx flags set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20 -stdlib=libc++ -fcoroutines") then -fcoroutines is an unknown argument. When I drop -fcoroutines the compiler complains Cppcoro requires a C++20 compiler with coroutine support.

So maybe we need to wait for clang12? Not sure if it works with clang8,9,10

[andreasbuhr]

-DCMAKE_CXX_STANDARD=20 should be all you need.

It works fine with both clang-10 and clang-11 in the CI.

[andreasbuhr]

Ah, just had an idea:
Maybe you do not have the clang standard library installed?
For clang 11 on debian-based:
sudo apt-get install libc++-11-dev libc++abi-11-dev

Does this help?

[whoisdavidvu]

Ah, just had an idea:
Maybe you do not have the clang standard library installed?
For clang 11 on debian-based:
sudo apt-get install libc++-11-dev libc++abi-11-dev

Does this help?

Thanks, this made it work for the clang build aswell.

[andreasbuhr]

Cool. I will add that step to the build documentation.