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[Qemu-devel] [RFC PATCH 0/4] ThreadSanitizer support

From: Alex Bennée
Subject: [Qemu-devel] [RFC PATCH 0/4] ThreadSanitizer support
Date: Mon, 25 Jan 2016 16:49:14 +0000

This is mainly motivated at being able to use the ThreadSanitizer to
give the MTTCG work a good testing for corner cases. However this
should be generally useful.

The first two patches are simple configure tweaks to make the passing
of flags sane. To build on my machine I installed the latest/greatest
GCC PPA and configured with:

    ./configure ${TARGET_LIST} --cc=gcc-5 --cxx=g++-5 \
  --extra-cflags="-fsanitize=thread" --extra-libs="-ltsan" \

The compiler selection gives the new GCC and I pass the -fsanitize
option in the cflags. I've introduced --extra-libs so we can link in
the ThreadSanitizer support library.

The third patch ensure we use the __atomic builtins for all atomic
functions if we have it available. This is needed so the
ThreadSanitizer can properly instrument the code but we should use it
anyway for consistency. The code generation for atomic accesses on x86
it unaffected.

Finally there is a patch with a few of the fixes for bugs thrown up
running make check. It doesn't fix them all as there are still some
warnings I need to look into more deeply.

Alex Bennée (4):
  configure: move EXTRA_CFLAGS append to the end
  configure: introduce --extra-libs
  include/qemu/atomic.h: default to __atomic functions
  tsan: various fixes for make check

 async.c                  |   4 +-
 configure                |  18 ++++++-
 include/qemu/atomic.h    | 126 ++++++++++++++++++++++++++++++-----------------
 tests/test-thread-pool.c |   2 +-
 thread-pool.c            |   9 ++--
 5 files changed, 105 insertions(+), 54 deletions(-)


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