I can't get my g++ to compile and link a minimal boost co-routine program (and I guess other components as well) on my machine.
// example.cpp
#include <boost/coroutine/all.hpp>
#include <iostream>
using namespace boost::coroutines;
void mycorofunc(coroutine<void>::push_type &sink){
std::cout << "1";
sink();
std::cout << " 3";
}
int main() {
coroutine<void>::pull_type source{mycorofunc};
std::cout << " 2";
source();
std::cout << " 4!" << std::endl;
}
I used apt-get to install boost (libboost-all-dev), but neither
g++ example.cpp -lboost_coroutine -lboost_system
nor
g++ example.cpp -I/usr/include -L/usr/lib/x86_64-linux-gnu -lboost_coroutine -lboost_system
works. g++'s output is as follows:
In file included from /usr/include/boost/coroutine/v1/coroutine.hpp:19:0,
from /usr/include/boost/coroutine/coroutine.hpp:13,
from /usr/include/boost/coroutine/all.hpp:11,
from example.cpp:3:
/usr/include/boost/type_traits/function_traits.hpp: In instantiation of ‘struct boost::function_traits<void>’:
example.cpp:7:31: required from here
/usr/include/boost/type_traits/function_traits.hpp:168:8: error: invalid use of incomplete type ‘struct boost::detail::function_traits_helper<void*>’
struct function_traits :
^
/usr/include/boost/type_traits/function_traits.hpp:21:36: error: declaration of ‘struct boost::detail::function_traits_helper<void*>’
template<typename Function> struct function_traits_helper;
^
example.cpp:7:31: error: ‘arity’ is not a member of ‘boost::function_traits<void>’
void mycorofunc(coroutine<void>::push_type &sink){
^
example.cpp:7:31: error: template argument 2 is invalid
example.cpp:7:44: error: expected ‘,’ or ‘...’ before ‘&’ token
void mycorofunc(coroutine<void>::push_type &sink){
^
example.cpp: In function ‘void mycorofunc(int)’:
example.cpp:9:8: error: ‘sink’ was not declared in this scope
sink();
^
example.cpp: In function ‘int main()’:
example.cpp:14:17: error: ‘arity’ is not a member of ‘boost::function_traits<void>’
coroutine<void>::pull_type source{mycorofunc};
^
example.cpp:14:17: error: template argument 2 is invalid
example.cpp:14:30: error: expected initializer before ‘source’
coroutine<void>::pull_type source{mycorofunc};
^
example.cpp:16:10: error: ‘source’ was not declared in this scope
source();
Some more information about my environment:
$$ locate coroutine/all.hpp
/usr/include/boost/coroutine/all.hpp
/usr/local/boost_1_58_0/boost/coroutine/all.hpp
$$ locate boost_system
/usr/lib/x86_64-linux-gnu/libboost_system.a
/usr/lib/x86_64-linux-gnu/libboost_system.so
/usr/lib/x86_64-linux-gnu/libboost_system.so.1.54.0
$$ locate boost_coroutine
/usr/lib/x86_64-linux-gnu/libboost_coroutine.a
$$ g++ -E -x c++ - -v < /dev/null # printing g++ include path
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.2-19ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
COLLECT_GCC_OPTIONS='-E' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.8/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE - -mtune=generic -march=x86-64 -fstack-protector -Wformat -Wformat-security
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.8"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.8
/usr/include/x86_64-linux-gnu/c++/4.8
/usr/include/c++/4.8/backward
/usr/lib/gcc/x86_64-linux-gnu/4.8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
# 1 "<stdin>"
# 1 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "<stdin>"
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.8/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-E' '-v' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
Compiler: have tried both g++ (v. 4.8.2) and g++-5
Distro: Ubuntu 14.04.1 LTS
After days of debugging, this is the solution I found. It is possible that even a subset of the following instructions is equally enough to go about the problem.
Perform the following instructions:
g++-6 (any version newer than 5.2 which supports c++14 will
most likely work as well, though I have not tested them).1.58 or newer (support for coroutine2). As of the date of
this post, the latest version available in Ubuntu PPA is
1.54. Therefore, you need to manually install boost. If you do not know how, follow this link. -std=c++14 flag. Also, if you are working with coroutines like me, make sure to link against libboost_context. I have noticed that for coroutines 2, libboost_system is not needed, perhaps because it is automally pulled in by libboost_context, though I'm not sure about the reason.To put these points together, here's the command I used to compile and link my code (let's say I install boost in /usr/local/):
g++-6 -std=c++14 example.cpp -I/usr/local/include -L/usr/local/lib -lboost_coroutine -lboost_context -lboost_system
Apparently, boost.coroutine library in boost 1.54 is implemented with the deprecated C-like fcontext-API from boost.context [source]. I have noticed that my machine had problem compiling those parts. Unfortunately, Ubuntu PPA does not offer any newer version than 1.54 at this moment. Boost.coroutine2 is the recommended library to use, which can be found in version 1.59 or newer. Therefore, you need to manually download a suitable version of boost from its website and install it.
After doing so, my code successfully compilied, but not linked:
... undefined reference to `ontop_fcontext' `boost::context::basic_fixedsize_stack<boost::context::stack_traits>::deallocate(boost::context::stack_context&)':
example.cpp:(...): undefined reference to `boost::context::stack_traits::minimum_size()'
example.cpp:(...): undefined reference to `boost::context::stack_traits::is_unbounded()'
example.cpp:(...): undefined reference to `boost::context::stack_traits::maximum_size()'
Surprisingly, adding -lboost_context flag to the compile command did not remove this link error, suggesting that libboost_context is not properly linked against.
I then came across a question in boost forum wherein the original poster had somewhat similar problem to what I had. In short, there are a number of C macros that prevent execution_context to be properly included, and thus the problem with libboost_context. The code to know if your compiler has some of these macros enabled is as follows (I'm not sure if all of these macros are relevant):
#include <boost/config.hpp>
#if defined(BOOST_NO_CXX11_AUTO_DECLARATIONS) || \
defined(BOOST_NO_CXX11_CONSTEXPR) || \
defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || \
defined(BOOST_NO_CXX11_FINAL) || \
defined(BOOST_NO_CXX11_HDR_TUPLE) || \
defined(BOOST_NO_CXX11_NOEXCEPT) || \
defined(BOOST_NO_CXX11_NULLPTR) || \
defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || \
defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) || \
defined(BOOST_NO_CXX11_UNIFIED_INITIALISATION_SYNTAX) || \
defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || \
defined(BOOST_NO_HDR_ATOMIC) || \
defined(BOOST_NO_HDR_TUPLE)
#error "execution_context is prevented to be included in this compiler";
#endif
The solution is easy: installing g++-6 (or I guess 5.2 or newer), and compiling the code with std=-c++14.