https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66262
--- Comment #6 from Gianfranco <costamagnagianfranco at yahoo dot it> --- Created attachment 35662 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35662&action=edit "Reduced" testcase I tried in the last few days to reduce as much as possible the testcase. I really hope it is enough for you to understand something more :) to reproduce: pbuilder-dist sid create pbuilder-dist sid login apt-get install vim cmake apt-get install libboost-chrono-dev libboost-system-dev libboost-locale-dev libboost-filesystem-dev apt-get install g++-5 cd casablanca/ mkdir build cd build/ cmake .. && make test_runner streams_test -j 9 && cd Binaries/ && ./test_runner libstreams_test.so #FAILURE cd ../.. mkdir build-gcc5 cd build-gcc5 export CXX=g++-5 cmake .. && make test_runner streams_test -j 9 && cd Binaries/ && ./test_runner libstreams_test.so #SUCCESS the build needs unittestpp to create the unittest, and needs the "test_runner" to open the library .so to run tests inside. The bug is for sure in the libstreams_test.so, created from this source file tests/functional/streams/fstreambuf_tests.cpp I guess this because copying the .so built in gcc-5 directory in the gcc-4 one makes the testsuite pass the tests. I can provide the binaries if needed, unfortunately I don't know how to debug the library inside, since it is called with dlopen. g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-19' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.9.2 (Debian 4.9.2-19) g++-5 -v Using built-in specs. COLLECT_GCC=g++-5 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 5.1.1-8' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=c++98 --disable-libstdcxx-dual-abi --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 5.1.1 20150528 (Debian 5.1.1-8) copying libstdc++6 from an ubuntu machine makes the test successfully pass on the gcc-4 build. (don't know how much of this is helpful for you) thanks a lot, Gianfranco
