[Boost-bugs] [Boost C++ Libraries] #13171: Linker error when using boost::process::posix::use_vfork

Subject: [Boost-bugs] [Boost C++ Libraries] #13171: Linker error when using boost::process::posix::use_vfork
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-08-21 11:41:16

#13171: Linker error when using boost::process::posix::use_vfork
----------------------------------------------------+---------------------
 Reporter:  Ton van den Heuvel <tonvandenheuvel@…>  |      Owner:  (none)
     Type:  Bugs                                    |     Status:  new
Milestone:  To Be Determined                        |  Component:  process
  Version:  Boost 1.64.0                            |   Severity:  Problem
 Keywords:                                          |
----------------------------------------------------+---------------------
 Trying to build the following code using GCC 7.1.1 and Boost 1.64.0 fails:

 {{{
 #include <boost/process.hpp>

 namespace bp = boost::process;

 int main(void)
 {
   bp::child c("ls", bp::posix::use_vfork);
   c.wait();
   return 0;
 }
 }}}

 The following linker error is generated:

 {{{
 In function 'boost::process::detail::posix::executor >,
 boost::fusion::filter_view&, boost::process::detail::posix::use_vfork_
 const&> const, boost::process::detail::is_initializer > > >
 >::operator()()':
 spawn_simple.cpp:(.text._ZN5boost7process6detail5posix8executorINS_6fusion10joint_viewINS4_5tupleIJNS2_12exe_cmd_initIcEEEEENS4_11filter_viewIKNS6_IJRA6_KcRNS2_8null_outILi1ELin1EEERKNS2_10use_vfork_EEEENS1_14is_initializerIN4mpl_3argILin1EEEEEEEEEEclEv[_ZN5boost7process6detail5posix8executorINS_6fusion10joint_viewINS4_5tupleIJNS2_12exe_cmd_initIcEEEEENS4_11filter_viewIKNS6_IJRA6_KcRNS2_8null_outILi1ELin1EEERKNS2_10use_vfork_EEEENS1_14is_initializerIN4mpl_3argILin1EEEEEEEEEEclEv]+0x31):
 undefined reference to `boost::process::detail::posix::executor >,
 boost::fusion::filter_view&, boost::process::detail::posix::use_vfork_
 const&> const, boost::process::detail::is_initializer > > >
 >::invoke(mpl_::bool_, mpl_::bool_)'
 }}}

 Given that Boost Process is a header-only library, why is the linker
 complaining about unresolved symbols in
 {{{boost::process::...::invoke()}}}?

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/13171>
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