On Tuesday, August 30, 2011 11:08:56 AM Alessandro Candini wrote:
My code (simplyfication of this: http://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/tutorial/tuttimer1/ src.html):
Being pedantic ... It does compile, the linker doesn't find the symbols. You need to link against the boost system and pthread library
#include <iostream> #include </usr/local/include/boost/asio.hpp> // Boost version 1.47.0 int main() { return 0; }
Compilation command: g++ -Wall -o timer1 timer1.cpp
Error: /tmp/ccGUgnoD.o: In function `__static_initialization_and_destruction_0(int, int)': timer1.cpp:(.text+0x52): undefined reference to `boost::system::generic_category()' timer1.cpp:(.text+0x5e): undefined reference to `boost::system::generic_category()' timer1.cpp:(.text+0x6a): undefined reference to `boost::system::system_category()' /tmp/ccGUgnoD.o: In function `boost::asio::error::get_system_category()': timer1.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::e rror::get_system_category()]+0x5): undefined reference to `boost::system::system_category()' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr_create(unsigned int&)': timer1.cpp:(.text._ZN5boost4asio6detail20posix_tss_ptr_createERj[boost::asio ::detail::posix_tss_ptr_create(unsigned int&)]+0x19): undefined reference to `pthread_key_create' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::a sio::detail::task_io_service>::context>::~posix_tss_ptr()': timer1.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1 _15task_io_serviceEE7contextEED2Ev[_ZN5boost4asio6detail13posix_tss_ptrINS1_ 10call_stackINS1_15task_io_serviceEE7contextEED5Ev]+0x15): undefined reference to `pthread_key_delete' /tmp/ccGUgnoD.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::a sio::detail::strand_service::strand_impl>::context>::~posix_tss_ptr()': timer1.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1 _14strand_service11strand_implEE7contextEED2Ev[_ZN5boost4asio6detail13posix_ tss_ptrINS1_10call_stackINS1_14strand_service11strand_implEE7contextEED5Ev]+ 0x15): undefined reference to `pthread_key_delete' collect2: ld returned 1 exit status make: *** [all] Error 1
Any ideas?
Thanks in advance.