Re: [libvirt PATCH v2 0/7] Enable sanitizers

This series enables and adds AddressSanitizer and UndefinedBehaviorSanitizer builds to the CI. See: https://clang.llvm.org/docs/AddressSanitizer.html and https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html These sanitizers already found some issues in libvirt, e.g. 4eb7c621985dad4de911ec394ac628bd1a5b29ab, 1294de209cee6643511265c7e2d4283c047cf652, 8b8c91f487592c6c067847ca59dde405ca17573f, or 1c34211c22de28127a509edbf2cf2f44cb0d891e. There exist two more relevant sanitizers, ThreadSanitizer and MemorySanitizer. Unfortunately, those two require an instrumented build of all dependencies, including libc, to work correctly. Note that clang and gcc have different implementations of these sanitizers, hence the introduction of two new jobs to the CI. The latter one issues a warning about the use of LD_PRELOAD in `virTestMain`, which in this particular case can be safely ignored by setting `ASAN_OPTIONS` to verify_asan_link_order=0` for the gcc build. Changes since V1: Incorporated changes suggested by Pavel, except for #6 (now #7): The statement in https://listman.redhat.com/archives/libvir-list/2021-May/msg00070.html on the sanitizers working with Fedora 33 is wrong, I was fooled by caching. The bug described there is present in Fedora 33, 34, and Rawhide. Cheers, Tim Tim Wiederhake (7): meson: Allow larger stack frames when instrumenting meson: Allow undefined symbols when sanitizers are enabled tests: virfilemock: realpath: Allow non-null second parameter openvz: Add missing symbols to libvirt_openvz.syms tests: openvzutilstest: Remove duplicate linking with libvirt_openvz.a virt-aa-helper: Remove duplicate linking with src/datatypes.o ci: Enable address and undefined behavior sanitizers .gitlab-ci.yml | 35 +++++++++++++++++++++++++++++++++++ build-aux/syntax-check.mk | 2 +- meson.build | 14 ++++++++++---- src/libvirt_openvz.syms | 2 ++ src/security/meson.build | 1 - tests/meson.build | 2 +- tests/virfilemock.c | 20 ++++++++++++-------- 7 files changed, 61 insertions(+), 15 deletions(-)