Why I had to use-D_GLIBCXX_USE_CXX11_ABI=0 to get a Boost.Test unit test to build and run
This is in the nature of a question, I am wondering *why* I had to use the -D_GLIBCXX_USE_CXX11_ABI=0 setting. This development is happening on Centos 7, where the system gcc/g++ is 4.8.5. So I recently built and installed gcc/g++ 8.2.0 from source, because I like Linux and prefer to try out C++17 stuff there rather than using a recent Visual Studio. That's just background. In any case I built the Boost Test module with ./b2 cxxflags="-stdlib=libc++ -std=c++14" linkflags="-stdlib=libc++ -std=c++14" going off suggestions I found. No evident problems there. After the install, among other things I end up with /usr/local/lib/libboost_unit_test_framework.so Now, I attempted to build a unit test with g++ -std=c++14 DocumentTest.cpp ../src/Document.cpp -I../include -L/usr/local/include -DBOOST_TEST_DYN_LINK -lboost_unit_test_framework The linker complained about an undefined reference for boost::unit_test::ut_detail::normalize_test_case_name[abi:cxx11](boost::unit_test::basic_cstring<char const>) Using nm -D on the shared library I see that the proper export symbol is there. abi:cxx11 seemed to offer some indication as to the problem, which is why after some experimentation I found that adding -D_GLIBCXX_USE_CXX11_ABI=0 to the unit test build command did the trick. The resulting a.out executes just fine (purely for debugging I made sure the unit test had a C++14 feature). I thought I sort of understood the ABI change business, gcc 5.1 before and after, but I guess I don't. What do I need to do, perhaps at the stage of building a Boost shared library, to not have to use that flag? Thanks for any wisdom. Arved Sandstrom
Are you sure you are actually using the new boost unit test you built, rather than some system installed one? Check with ldd which actual boost_unit_test_framework you are loading when you run the executable. The other question is when you invoke b2 is it using your custom gcc-8.2 or system gcc-4.8.5? Cheers, Andrew On Sun, Aug 19, 2018 at 12:00 PM Arved Sandstrom via Boost-users < boost-users@lists.boost.org> wrote:
This is in the nature of a question, I am wondering *why* I had to use the -D_GLIBCXX_USE_CXX11_ABI=0 setting.
This development is happening on Centos 7, where the system gcc/g++ is 4.8.5. So I recently built and installed gcc/g++ 8.2.0 from source, because I like Linux and prefer to try out C++17 stuff there rather than using a recent Visual Studio. That's just background.
In any case I built the Boost Test module with
./b2 cxxflags="-stdlib=libc++ -std=c++14" linkflags="-stdlib=libc++ -std=c++14"
going off suggestions I found. No evident problems there. After the install, among other things I end up with
/usr/local/lib/libboost_unit_test_framework.so
Now, I attempted to build a unit test with
g++ -std=c++14 DocumentTest.cpp ../src/Document.cpp -I../include -L/usr/local/include -DBOOST_TEST_DYN_LINK -lboost_unit_test_framework
The linker complained about an undefined reference for
boost::unit_test::ut_detail::normalize_test_case_name[abi:cxx11](boost::unit_test::basic_cstring<char const>)
Using nm -D on the shared library I see that the proper export symbol is there. abi:cxx11 seemed to offer some indication as to the problem, which is why after some experimentation I found that adding -D_GLIBCXX_USE_CXX11_ABI=0 to the unit test build command did the trick. The resulting a.out executes just fine (purely for debugging I made sure the unit test had a C++14 feature).
I thought I sort of understood the ABI change business, gcc 5.1 before and after, but I guess I don't. What do I need to do, perhaps at the stage of building a Boost shared library, to not have to use that flag?
Thanks for any wisdom.
Arved Sandstrom
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