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5 # Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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35 # Custom build type "TSAN", to be used for compiling GROMACS with
36 # clang or gcc with ThreadSanitizer (aka "TSan") turned on, so that
37 # the tests can be run to detect data races.
39 # The main advantage of the clang version is that there can be a
40 # suppressions file that acts at compile time, though there is no use of
41 # that yet. The main advantage of the gcc version is that it can be used
42 # with a OpenMP (if gomp is compiled with --disable-linux-futex).
44 # Unfortunately, out of the box Thread-MPI provokes several false
45 # positives. One example is that tMPI_Event_t contains an atomic int
46 # field "sync" that is initialized before thread spawn. During a
47 # collective, this is atomically updated by the source thread, and the
48 # update is observed by sink threads in tMPI_Event_wait, which do a
49 # yield wait when no change has occured. This means the read can
50 # happen before the write (by design, whether or not the read is
51 # atomic), but the surrounding logic prevents action until the write
52 # has happened. There is no way for the sink thread(s) to avoid
53 # reading until the write has happened - that is the point of the
56 # This ought to be able to be suppressed, but my attempts to apply
57 # suppressions on individual functions don't suppress reporting of the
58 # race event. Applying the suppression to the whole thread-MPI library
59 # might work, but seems to defeat the point. We want to be able to
60 # detect mis-use of the primitives provided by thread-MPI.
62 # This means there needs to be a way for this build type to trigger
63 # the use of the generic mutex-based fallback implementation within
66 # Later, if a blacklist is needed, use something like
67 # "-fsanitize-blacklist=${CMAKE_SOURCE_DIR}/cmake/thread-sanitizer.supp"
68 # TODO find a better home for this and other suppression files
69 set(_flags "-O1 -g -fsanitize=thread")
71 foreach(_language C CXX)
73 string(REPLACE "X" "+" _human_readable_language ${_language})
75 if (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
76 set(CMAKE_${_language}_FLAGS_TSAN "${_flags} -pie -fPIE" CACHE STRING "${_human_readable_language} flags for thread sanitizer" FORCE)
78 set(CMAKE_${_language}_FLAGS_TSAN ${_flags} CACHE STRING "${_human_readable_language} flags for thread sanitizer" FORCE)
80 mark_as_advanced(CMAKE_${_language}_FLAGS_TSAN)
81 string(TOUPPER "${CMAKE_BUILD_TYPE}" _cmake_build_type)
82 if (_cmake_build_type STREQUAL TSAN)
83 set(TMPI_ATOMICS_DISABLED 1)