compile error at 48% (overloaded call is 'ambiguous')

[dchmelik]

I'm on Slackware64 GNU/Linux up-to-date stable with (extra/unofficial) leveldb-1.9.0-x86_64-1_SBo. I got cpp-ethereum code from git some minutes ago, tried to compile. It gets to 48% then says something is ambiguous:

[ 48%] Building CXX object libethereum/CMakeFiles/ethereum.dir/WarpHostCapability.cpp.o
In file included from /home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/operations.hpp:17:0,
                 from /home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/condition_variable.hpp:25,
                 from /home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/barrier.hpp:14,
                 from /home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/all.hpp:15,
                 from /home/user/cpp-ethereum/libethereum/WarpHostCapability.cpp:21:
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp: In instantiation of ‘boost::fibers::fiber::fiber(Fn&&, Arg ...) [with Fn = void (dev::eth::{anonymous}::WarpPeerObserver::*)(std::shared_ptr<dev::eth::WarpPeerCapability>); Arg = {dev::eth::{anonymous}::WarpPeerObserver*, std::shared_ptr<dev::eth::WarpPeerCapability>}; <template-parameter-1-3> = void; <template-parameter-1-4> = void; <template-parameter-1-5> = void]’:
/home/user/cpp-ethereum/libethereum/WarpHostCapability.cpp:69:68:   required from here
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:68:71: error: call of overloaded ‘fiber(<brace-enclosed initializer list>)’ is ambiguous
                std::forward< Fn >( fn), std::forward< Arg >( arg) ... } {
                                                                       ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:106:5: note: candidate: boost::fibers::fiber::fiber(boost::fibers::launch, std::allocator_arg_t, StackAllocator, Fn&&, Arg ...) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = void (dev::eth::{anonymous}::WarpPeerObserver::*)(std::shared_ptr<dev::eth::WarpPeerCapability>); Arg = {dev::eth::{anonymous}::WarpPeerObserver*, std::shared_ptr<dev::eth::WarpPeerCapability>}]
     fiber( launch policy, std::allocator_arg_t, StackAllocator salloc, Fn && fn, Arg ... arg) :
     ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:78:5: note: candidate: boost::fibers::fiber::fiber(boost::fibers::launch, Fn&&, Arg ...) [with Fn = const std::allocator_arg_t&; Arg = {boost::context::basic_fixedsize_stack<boost::context::stack_traits>, void (dev::eth::{anonymous}::WarpPeerObserver::*)(std::shared_ptr<dev::eth::WarpPeerCapability>), dev::eth::{anonymous}::WarpPeerObserver*, std::shared_ptr<dev::eth::WarpPeerCapability>}; <template-parameter-1-3> = void]
     fiber( launch policy, Fn && fn, Arg ... arg) :
     ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:64:5: note: candidate: boost::fibers::fiber::fiber(Fn&&, Arg ...) [with Fn = boost::fibers::launch; Arg = {std::allocator_arg_t, boost::context::basic_fixedsize_stack<boost::context::stack_traits>, void (dev::eth::{anonymous}::WarpPeerObserver::*)(std::shared_ptr<dev::eth::WarpPeerCapability>), dev::eth::{anonymous}::WarpPeerObserver*, std::shared_ptr<dev::eth::WarpPeerCapability>}; <template-parameter-1-3> = void; <template-parameter-1-4> = void; <template-parameter-1-5> = void]
     fiber( Fn && fn, Arg ... arg) :
     ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp: In instantiation of ‘boost::fibers::fiber::fiber(Fn&&, Arg ...) [with Fn = void (dev::eth::{anonymous}::WarpPeerObserver::*)(); Arg = {dev::eth::{anonymous}::WarpPeerObserver*}; <template-parameter-1-3> = void; <template-parameter-1-4> = void; <template-parameter-1-5> = void]’:
/home/user/cpp-ethereum/libethereum/WarpHostCapability.cpp:75:81:   required from here
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:68:71: error: call of overloaded ‘fiber(<brace-enclosed initializer list>)’ is ambiguous
                std::forward< Fn >( fn), std::forward< Arg >( arg) ... } {
                                                                       ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:106:5: note: candidate: boost::fibers::fiber::fiber(boost::fibers::launch, std::allocator_arg_t, StackAllocator, Fn&&, Arg ...) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = void (dev::eth::{anonymous}::WarpPeerObserver::*)(); Arg = {dev::eth::{anonymous}::WarpPeerObserver*}]
     fiber( launch policy, std::allocator_arg_t, StackAllocator salloc, Fn && fn, Arg ... arg) :
     ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:78:5: note: candidate: boost::fibers::fiber::fiber(boost::fibers::launch, Fn&&, Arg ...) [with Fn = const std::allocator_arg_t&; Arg = {boost::context::basic_fixedsize_stack<boost::context::stack_traits>, void (dev::eth::{anonymous}::WarpPeerObserver::*)(), dev::eth::{anonymous}::WarpPeerObserver*}; <template-parameter-1-3> = void]
     fiber( launch policy, Fn && fn, Arg ... arg) :
     ^
/home/user/.hunter/_Base/aa1facc/eb55840/852a159/Install/include/boost/fiber/fiber.hpp:64:5: note: candidate: boost::fibers::fiber::fiber(Fn&&, Arg ...) [with Fn = boost::fibers::launch; Arg = {std::allocator_arg_t, boost::context::basic_fixedsize_stack<boost::context::stack_traits>, void (dev::eth::{anonymous}::WarpPeerObserver::*)(), dev::eth::{anonymous}::WarpPeerObserver*}; <template-parameter-1-3> = void; <template-parameter-1-4> = void; <template-parameter-1-5> = void]
     fiber( Fn && fn, Arg ... arg) :
     ^
libethereum/CMakeFiles/ethereum.dir/build.make:254: recipe for target 'libethereum/CMakeFiles/ethereum.dir/WarpHostCapability.cpp.o' failed
gmake[2]: *** [libethereum/CMakeFiles/ethereum.dir/WarpHostCapability.cpp.o] Error 1
CMakeFiles/Makefile2:810: recipe for target 'libethereum/CMakeFiles/ethereum.dir/all' failed
gmake[1]: *** [libethereum/CMakeFiles/ethereum.dir/all] Error 2
Makefile:160: recipe for target 'all' failed
gmake: *** [all] Error 2

[gumb0]

Which compiler version do you use?

[dchmelik]

I'm using gcc 5.3.0.