I can't seem to get Boost's unit test framework to work on OS X Leopard (10.5) when using "-arch x86_64" for 64-bit builds (note: the programs I build using boost seem to work fine, but the unit tests blow up). I have Xcode 3.1.2 installed, and the results are the same if I'm using gcc 4.0 or 4.2. I used the 32_64.diff patch from trac to make 4-way Universal boost libraries (https://svn.boost.org/trac/boost/ticket/1679 ). Any ideas would be greatly appreciated =) Thanks, -Mike Without "-arch x86_64" (defaults to 32-bit intel): Mikes-Mac-Pro:~ mdickey$ g++ -DBOOST_TEST_DYN_LINK -I/usr/local/ include/boost-1_37 -L/usr/local/lib -lboost_unit_Test_framework-xgcc42- mt -o test test.cpp Mikes-Mac-Pro:~ mdickey$ ./test Running 5 test cases... *** No errors detected With "-arch x86_64": Mikes-Mac-Pro:~ mdickey$ g++ -arch x86_64 -DBOOST_TEST_DYN_LINK -I/usr/ local/include/boost-1_37 -L/usr/local/lib -lboost_unit_Test_framework- xgcc42-mt -o test test.cpp Mikes-Mac-Pro:~ mdickey$ ./test --log_level=all Running 5 test cases... Entering test suite "simple-unit-test" Entering test suite "SimpleTests_S" Entering test case "test1" Test case test1 doesn't include any assertions Leaving test case "test1"; testing time: 22mks Entering test case "test2" Test case test2 doesn't include any assertions Leaving test case "test2"; testing time: 15mks Entering test case "test3" Test case test3 doesn't include any assertions Leaving test case "test3"; testing time: 16mks Entering test case "test4" Test case test4 doesn't include any assertions Leaving test case "test4"; testing time: 15mks Entering test case "test5" Test case test5 doesn't include any assertions Leaving test case "test5"; testing time: 14mks Leaving test suite "SimpleTests_S" Leaving test suite "simple-unit-test" *** No errors detected test(93789) malloc: *** error for object 0x30001001004d0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug test(93789) malloc: *** error for object 0x30001001005d0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug test(93789) malloc: *** error for object 0x30001001006c0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug test(93789) malloc: *** error for object 0x30001001007c0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug gdb backtrace to malloc_error_break (note above that it's happening after completion of all tests): #0 0x00007fff810a9a11 in malloc_error_break () #1 0x00007fff810a4a90 in szone_error () #2 0x00000001000156ec in ~framework_impl [inlined] () at impl/ framework.ipp:133 #3 0x00000001000156ec in __tcf_1 () at impl/framework.ipp:222 #4 0x00007fff8100131c in __cxa_finalize () #5 0x00007fff81001232 in exit () #6 0x0000000100001057 in start () Confirm test program is a 64-bit executable: Mikes-Mac-Pro:~ mdickey$ file test test: Mach-O 64-bit executable x86_64 Dynamic linkage of test program: Mikes-Mac-Pro:~ mdickey$ otool -L test test: libboost_unit_test_framework-xgcc42-mt-1_37.dylib (compatibility version 0.0.0, current version 0.0.0) /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0) /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.3) Confirm Universal/FAT build of Boost libraries: Mikes-Mac-Pro:~ mdickey$ file /usr/local/lib/ libboost_unit_test_framework-xgcc42-mt.dylib /usr/local/lib/libboost_unit_test_framework-xgcc42-mt.dylib: Mach-O universal binary with 4 architectures /usr/local/lib/libboost_unit_test_framework-xgcc42-mt.dylib (for architecture i386): Mach-O dynamically linked shared library i386 /usr/local/lib/libboost_unit_test_framework-xgcc42-mt.dylib (for architecture ppc7400): Mach-O dynamically linked shared library ppc /usr/local/lib/libboost_unit_test_framework-xgcc42-mt.dylib (for architecture x86_64): Mach-O 64-bit dynamically linked shared library x86_64 /usr/local/lib/libboost_unit_test_framework-xgcc42-mt.dylib (for architecture ppc64): Mach-O 64-bit dynamically linked shared library ppc64 Source code for test.cpp (note that if I have just one or two test cases it doesn't crash.. having several IS significant): #define BOOST_TEST_MODULE simple-unit-test #include <boost/test/unit_test.hpp> class SimpleFixture { public: SimpleFixture() {} virtual ~SimpleFixture() {} }; BOOST_FIXTURE_TEST_SUITE(SimpleTests_S, SimpleFixture) BOOST_AUTO_TEST_CASE(test1) {} BOOST_AUTO_TEST_CASE(test2) {} BOOST_AUTO_TEST_CASE(test3) {} BOOST_AUTO_TEST_CASE(test4) {} BOOST_AUTO_TEST_CASE(test5) {} BOOST_AUTO_TEST_SUITE_END()