Re: [Boost-users] thread: linux fedora .so built file under c++98 does not provide start_thread() symbol

18 Oct 2013


      Le 18/10/13 21:39, MM a écrit :
...
On 18 October 2013 20:04, Vicente J. Botet Escriba 
mailto:vicente.botet@wanadoo.fr> wrote:
Le 18/10/13 20:50, MM a écrit :
hello,
I am compiling my code with g++4.8.1 under c++11 mode, however
        the fedora's system provided boost thread lib has been
        compiled under c++98.
Linking fails because of errors like:
mainthread.cpp:(.text+0x2cf): undefined reference to
        `boost::thread::start_thread()'
        mainthread.cpp:(.text+0xcc9): undefined reference to
        `boost::thread::join()'
looking at the provided shared object,
        nm -C -D /usr/lib64/libboost_thread-mt.so.1.53.0 |grep
        start_thread
000000000000ba80 T
        boost::thread::start_thread_noexcept(boost::thread_attributes
        const&)
        000000000000ba00 T boost::thread::start_thread_noexcept()
neither of which is start_thread()
I've put an entry here
        https://bugzilla.redhat.com/show_bug.cgi?id=1021009
Is there a possible workaround?
Are you sure your compiling with Boost 1.53?
    start_thread is defined in boost/thread/detail/thread.h lines
    178-184 as
void start_thread()
            {
              if (!start_thread_noexcept())
              {
                boost::throw_exception(thread_resource_error());
              }
            }
Indeed, this file (thread.hpp not .h) is there and has the same code 
at the same lines.
However /usr/lib64/libboost_thread-mt.so.1.53.0 doesn't have 
start_thread() symbol at all.
start_thread_noexcept() is there though.
start_thread is defined inside a class and would expect it to be 
inlined. I don't understand why the symbols is unresolved. Please could 
you compile with -E and take a look at the preprocessed output?
...
Fedora guys said they compile with g++4.8 but with c++98, not c++11
Does it works if you compile with c++98?
Best,
Vicente
...
Please could you check this file and the contexts of this linenes
Best,
    Vicente
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