Provide a way to use C++11 with C++ ports

[akimd (Akim Demaille)]

The following simple piece of code works as expected with GCC, however it fails with clang, whatever the version I tried (MP's 3.1, 3.2 and 3.3).

#include <sstream>
#include <iostream>

#include <boost/regex.hpp>

int main (int argc, const char* argv[])
{
  boost::regex exp("*"); 
  boost::regex_match("foo", exp);
}

clang++ 3.3

$ clang++-mp-3.3 -std=c++11 -stdlib=libc++ -I/opt/local/include -L/opt/local/lib -lboost_regex-mt foo.cc 
Undefined symbols for architecture x86_64:
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)", referenced from:
      boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*) in foo-abEP0S.o
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()", referenced from:
      bool boost::regex_match<char const*, std::__1::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) in foo-abEP0S.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

GCC

$ g++-mp-4.8 -std=c++11 -I/opt/local/include -L/opt/local/lib -lboost_regex-mt foo.cc
$

Clang 3.2 and 3.1

$ clang++-mp-3.2 -std=c++11 -stdlib=libc++ -I/opt/local/include -L/opt/local/lib -lboost_regex-mt foo.cc
Undefined symbols for architecture x86_64:
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)", referenced from:
      boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*) in foo-vigR70.o
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()", referenced from:
      bool boost::regex_match<char const*, std::__1::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) in foo-vigR70.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
$ clang++-mp-3.1 -std=c++11 -stdlib=libc++ -I/opt/local/include -L/opt/local/lib -lboost_regex-mt foo.cc
Undefined symbols for architecture x86_64:
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)", referenced from:
      boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*) in foo-MudWDP.o
  "boost::re_detail::perl_matcher<char const*, std::__1::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()", referenced from:
      bool boost::regex_match<char const*, std::__1::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::__1::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags) in foo-MudWDP.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Note that the error at linking is the same that you'd get if you don't pass -lboost_regex-mt at all, so probably something is going wrong when trying to use this library.

Cheers!

[jeremyhu (Jeremy Huddleston Sequoia)]

If you want to use libc++, please try out trunk/base r110519 or later with 'cxx_stdlib libc++' set in ${prefix}/etc/macports/macports.conf