Hi, My problem might be a beginner one, but I spent all day searching forums and mailing archives and it didn't help much, so I am asking at the source. The reason why I write this email is that modifying boost source helps but what I did is not enough. what I did : - a first test file using helper macros to test a class (works fine alone) : #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_SUITE(Class1TestsSuite); BOOST_AUTO_TEST_CASE( test1 ){ BOOST_CHECK(1 == 2-1); } BOOST_AUTO_TEST_SUITE_END(); - add a second test file using helper macros to test an other class (compilation is OK, link KO) : #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_SUITE(Class2TestsSuite); BOOST_AUTO_TEST_CASE( test2 ){ BOOST_CHECK(1 != 2); } BOOST_AUTO_TEST_SUITE_END(); Here are the errors : c:/dev/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/c++/4.2.1-dw2/new multiple definition of `init_unit_test_suite(int, char**)' line 105 tests\main.o:c:/dev/mingw/bin/../lib/gcc/i686-pc-mingw32/4.2.1-dw2/../../../../include/boost/test/unit_test_suite.hpp first defined here line 184 I have edited unit_test_suite.hpp to add inline decalration to init_unit_test_suite : #else inline ::boost::unit_test::test_suite* init_unit_test_suite( int, char* [] ) { #endif Doing so, first error is suppressed. I might need to rebuild boost test lib for the second, but I haven't the tools at workplace. I am using : - Windows XP - MinGW packaged with boost 1.34.1 (http://nuwen.net/mingw.html) - Eclipse CDT Regards, Jérôme. This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. Overlay AM (and its subsidiaries) shall (will) not therefore be liable for the message if modified. --------------------------------------------- Ce message et toutes les pieces jointes (ci-apres le "message") sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, Overlay AM (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.