Package: clang-11 Version: 1:11.0.1-2~bpo10+1 Severity: normal If I have a mixed C/C++ code with classes with virtual function in it, and I am trying to build it with BUSan with -fno-sanitize-recover=undefined option, then I get undefined reference error messages
/home/nataraj/test/ubsan_cpp_c/library.cpp:8: undefined reference to `__ubsan_vptr_type_cache' /usr/bin/ld: /home/nataraj/test/ubsan_cpp_c/library.cpp:8: undefined reference to `__ubsan_handle_dynamic_type_cache_miss_abort' I can fix these undefined references by specifying explicitly linking to clang_rt.ubsan_standalone_cxx-x86_64 library, but this is not how it should work as I can guess. Here I offer a sample project that allows to reproduce the problem. (I am not sure I will be able to add attach via reportbug, if not, I will attach it in the next message) When I buitld this project as written in build_ubsan_broken.sh: make clean CC=clang-11 CXX=clang++-11 \ CFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined" \ CXXFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined" \ LDFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined"\ make building will fail. But if I add -Wl,--whole-archive -L/usr/lib/clang/11/lib/linux/ -lclang_rt.ubsan_standalone_cxx-x86_64 -Wl,--no-whole-archive to LDFLAGS (see build_ubsan_wokarounded.sh), it will successfully build: make clean # Using hack suggested in http://clang-developers.42468.n3.nabble.com/fsanitize-undefined-and-shared-libraries-td4029561.html#a4029653 CC=clang-11 CXX=clang++-11 \ CFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined" \ CXXFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined" \ LDFLAGS="-fsanitize=undefined -fno-sanitize-recover=undefined -Wl,--whole-archive -L/usr/lib/clang/11/lib/linux/ -lclang_rt.ubsan_standalone_cxx-x86_64 -Wl,--no-whole-archive"\ make I guess this should be fixed and symbols from clang_rt.ubsan_standalone_cxx-x86_64 should be added to some library that are linked by default when you use -fsanitize=undefined -- System Information: Debian Release: 10.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.19.0-9-amd64 (SMP w/8 CPU cores) Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE=ru_RU.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages clang-11 depends on: ii binutils 2.31.1-16 ii libc6 2.28-10 ii libc6-dev 2.28-10 ii libclang-common-11-dev 1:11.0.1-2~bpo10+1 ii libclang-cpp11 1:11.0.1-2~bpo10+1 ii libclang1-11 1:11.0.1-2~bpo10+1 ii libgcc-8-dev 8.3.0-6 ii libgcc1 1:8.3.0-6 ii libllvm11 1:11.0.1-2~bpo10+1 ii libobjc-8-dev 8.3.0-6 ii libstdc++-8-dev 8.3.0-6 ii libstdc++6 8.3.0-6 Versions of packages clang-11 recommends: pn libomp-11-dev <none> ii llvm-11-dev 1:11.0.1-2~bpo10+1 ii python3 3.7.3-1 Versions of packages clang-11 suggests: pn clang-11-doc <none> -- no debconf information
ubsan_cpp_c.tgz
Description: application/gzip
