Boost 1.33.0 Unit_test_example1 is OK in debug thus: ------ Rebuild All started: Project: unit_test_framework, Configuration: Debug Win32 ------ Deleting intermediate and output files for project 'unit_test_framework', configuration 'Debug|Win32' Compiling... xml_report_formatter.cpp xml_log_formatter.cpp unit_test_suite.cpp unit_test_parameters.cpp unit_test_monitor.cpp unit_test_main.cpp unit_test_log.cpp test_tools.cpp results_reporter.cpp results_collector.cpp progress_monitor.cpp plain_report_formatter.cpp framework.cpp i:\boost_1_33_0\boost\test\impl\framework.ipp(313) : warning C4244: 'initializing' : conversion from 'time_t' to 'unsigned int', possible loss of data execution_monitor.cpp compiler_log_formatter.cpp Generating Code... i:\boost_1_33_0\boost\lexical_cast.hpp(223) : warning C4701: potentially uninitialized local variable 'result' used Creating library... Creating browse information file... Microsoft Browse Information Maintenance Utility Version 8.00.50215 Copyright (C) Microsoft Corporation. All rights reserved. Build log was saved at "file://c:\temp\boost_test_library\Debug\BuildLog.htm" unit_test_framework - 0 error(s), 2 warning(s) ------ Rebuild All started: Project: unit_test_example1, Configuration: Debug Win32 ------ Deleting intermediate and output files for project 'unit_test_example1', configuration 'Debug|Win32' Compiling... unit_test_example1.cpp Compiling manifest to resources... Linking... LINK : .\Debug/unit_test_example1.exe not found or not built by the last incremental link; performing full link unit_test_framework.lib(compiler_log_formatter.obj) : warning LNK4099: PDB 'vc80.pdb' was not found with 'Debug\unit_test_framework.lib' or at 'i:\boost_1_33_0\libs\test\build\msvc71_proj\Debug\vc80.pdb'; linking object as if no debug info ... many similar - needs to avoid incremental liking???? Embedding manifest... Build log was saved at "file://c:\temp\boost_test_library\Debug\BuildLog.htm" unit_test_example1 - 0 error(s), 15 warning(s) ========== Rebuild All: 2 succeeded, 0 failed, 0 skipped ========== and runs as expected Running 1 test case... i:/boost_1_33_0/libs/test/example/unit_test_example1.cpp(17): error in "free_tes t_function": check 2 == 1 failed unknown location(0): fatal error in "free_test_function": memory access violatio n *** 1 failure detected (1 failure expected) in test suite "Unit test example 1" Press any key to continue . . . BUT in release >>>>>>>>>>>>>>>>> ------ Rebuild All started: Project: unit_test_framework, Configuration: Release Win32 ------ Deleting intermediate and output files for project 'unit_test_framework', configuration 'Release|Win32' Compiling... xml_report_formatter.cpp xml_log_formatter.cpp unit_test_suite.cpp unit_test_parameters.cpp unit_test_monitor.cpp unit_test_main.cpp unit_test_log.cpp test_tools.cpp results_reporter.cpp results_collector.cpp progress_monitor.cpp plain_report_formatter.cpp framework.cpp ..\..\..\..\boost/test/impl/framework.ipp(313) : warning C4244: 'initializing' : conversion from 'time_t' to 'unsigned int', possible loss of data execution_monitor.cpp ..\..\..\..\boost/test/impl/execution_monitor.ipp(214) : warning C4535: calling _set_se_translator() requires /EHa compiler_log_formatter.cpp Generating Code... Creating library... Build log was saved at "file://i:\boost_1_33_0\libs\test\build\msvc71_proj\Release\BuildLog.htm" unit_test_framework - 0 error(s), 2 warning(s) So library builds OK <<<<<<<<<<<<<<<< ------ Rebuild All started: Project: unit_test_example1, Configuration: Release Win32 ------ Deleting intermediate and output files for project 'unit_test_example1', configuration 'Release|Win32' Compiling... unit_test_example1.cpp Linking... msvcprt.lib(MSVCP80.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@ Z) already defined in unit_test_example1.obj <snip> ... MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCMT.lib(typinfo.obj) LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library .\Release/unit_test_example1.exe : fatal error LNK1169: one or more multiply defined symbols found Build log was saved at "file://i:\boost_1_33_0\libs\test\build\msvc71_proj\Release\BuildLog.htm" unit_test_example1 - 33 error(s), 1 warning(s) ========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ========== Suggestions? Thanks Paul Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539 561830 +44 7714 330204 mailto: pbristow@hetp.u-net.com