Description of problem:
boost headers (and web page) support up to 3.4. 

When compiling a simple C++ file with clang++-3.5 that includes boost/thread.hpp and uses the -march compilation options the compilation fails


Version-Release number of selected component (if applicable):
boost-1.55 from frdora 21
clang 3.5.0 from fedora 21

How reproducible:
Always (see simple source code below)

== source ==

#include <iostream>  
#include <boost/thread.hpp>   
#include <boost/date_time.hpp>       

using namespace std;

void workerFunc()                                
{                                                                                   boost::posix_time::seconds workTime(3);
    cout << "Worker: running" << endl;
    boost::this_thread::sleep(workTime);
    cout << "Worker: finished" << endl;
}    
      
int main(int argc, char* argv[])
{
   cout << "main: startup" << endl;
   boost::thread workerThread(workerFunc);

   cout << "main: waiting for thread" << endl;
   workerThread.join();

   cout << "main: done" << endl;
   return 0;
}

=== compilation ===

clang++ thr1.cpp -o thr -lboost_thread  ==> OK
clang++ -march=core2 thr1.cpp -o thr -lboost_thread  ==> FAIL
clang++ -march=native thr1.cpp -o thr -lboost_thread  ==> FAIL

== workaround == 

Add -DBOOST_HAS_INT128 since clang 3.5.0 actually has it

clang++ -march=native -DBOOST_HAS_INT128 thr1.cpp -o thr1 -lboost_thread ==> OK

== Note == 

compilation with clang 3.4 (before upgrade) was OK
compilation with gcc is of course OK