[Boost-build] undefined reference to pthread

Subject: [Boost-build] undefined reference to pthread
From: Mathieu Champlon (m.champlon_at_[hidden])
Date: 2015-09-07 16:45:23

Hello,

My project uses Boost.Build, here is what my unit tests jamfile (partly) 
looks like

rule run-test ( name )
{
   run $(name) /boost//unit_test_framework /boost//thread : : : 
<define>BOOST_THREAD_USES_MOVE : $(name)_thread_safe ;
}

rule run-tests
{
   for name in [ glob test_*.cpp detail/test_*.cpp ] { run-test $(name) ; }
}

Before Boost 1.59 this was linking fine but with Boost 1.59 (and master) 
it fails.
(I have continuous integration testing ranging several versions of boost)
Here is the error:

gcc.link 
bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/test_sequence~cpp_thread_safe

bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/test_sequence.o: In 
function `recursive_mutex':

/home/travis/boost/boost/thread/pthread/recursive_mutex.hpp:67: 
undefined reference to `pthread_mutexattr_init'

/home/travis/boost/boost/thread/pthread/recursive_mutex.hpp:72: 
undefined reference to `pthread_mutexattr_settype'

/home/travis/boost/boost/thread/pthread/recursive_mutex.hpp:75: 
undefined reference to `pthread_mutexattr_destroy'

/home/travis/boost/boost/thread/pthread/recursive_mutex.hpp:82: 
undefined reference to `pthread_mutexattr_destroy'

/home/travis/boost/boost/thread/pthread/recursive_mutex.hpp:85: 
undefined reference to `pthread_mutexattr_destroy'

collect2: ld returned 1 exit status

"g++" -Wl,-R 
-Wl,"/home/travis/boost/bin.v2/libs/chrono/build/gcc-4.6/debug" -Wl,-R 
-Wl,"/home/travis/boost/bin.v2/libs/chrono/build/gcc-4.6/debug/threading-multi" 
-Wl,-R -Wl,"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug" 
-Wl,-R 
-Wl,"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug/threading-multi" 
-Wl,-R -Wl,"/home/travis/boost/bin.v2/libs/test/build/gcc-4.6/debug" 
-Wl,-R 
-Wl,"/home/travis/boost/bin.v2/libs/thread/build/gcc-4.6/debug/threading-multi" 
-Wl,-R -Wl,"/home/travis/boost/bin.v2/libs/timer/build/gcc-4.6/debug" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/chrono/build/gcc-4.6/debug" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/chrono/build/gcc-4.6/debug/threading-multi" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug/threading-multi" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/test/build/gcc-4.6/debug" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/thread/build/gcc-4.6/debug/threading-multi" 
-Wl,-rpath-link 
-Wl,"/home/travis/boost/bin.v2/libs/timer/build/gcc-4.6/debug" -o 
"bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/test_sequence~cpp_thread_safe" 
-Wl,--start-group 
"bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/test_sequence.o" 
"bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/undefined.o" 
"/home/travis/boost/bin.v2/libs/test/build/gcc-4.6/debug/libboost_unit_test_framework.so.1.59.0" 
"/home/travis/boost/bin.v2/libs/thread/build/gcc-4.6/debug/threading-multi/libboost_thread.so.1.59.0" 
"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug/libboost_system.so.1.59.0" 
"/home/travis/boost/bin.v2/libs/chrono/build/gcc-4.6/debug/threading-multi/libboost_chrono.so.1.59.0" 
"/home/travis/boost/bin.v2/libs/system/build/gcc-4.6/debug/threading-multi/libboost_system.so.1.59.0" 
-Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group -g --coverage

...failed gcc.link 
bin/test_sequence~cpp_thread_safe.test/gcc-4.6/debug/test_sequence~cpp_thread_safe...

It looks like -pthread is missing from the command line, but isn't 
Boost.Build supposed to take care of this ?
The system is a linux, probably ubuntu but not sure, it's run by 
travis-ci, see https://travis-ci.org/mat007/turtle

Any clue what is going wrong and how I can fix it ?

Many thanks !
MAT.