Re: [PATCH] btrfs-progs: Enable ThreadSanitizer, using D=tsan.

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On Wed, Jul 12, 2017 at 01:04:49PM -0700, Adam Buchbinder wrote:
> Tested with clang-3.9.
> 
> Signed-off-by: Adam Buchbinder <abuchbinder@xxxxxxxxxx>
> ---
>  Makefile | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index 81598df..8948301 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -17,6 +17,7 @@
>  #                  abort   - call abort() on first error (dumps core)
>  #                  all     - shortcut for all of the above
>  #                  asan    - enable address sanitizer compiler feature
> +#                  tsan    - enable thread sanitizer compiler feature
>  #                  ubsan   - undefined behaviour sanitizer compiler feature
>  #                  bcheck  - extended build checks
>  #   W=123          build with warnings (default: off)
> @@ -157,6 +158,11 @@ ifneq (,$(findstring asan,$(D)))
>    DEBUG_CFLAGS_INTERNAL += -fsanitize=address
>  endif
>  
> +ifneq (,$(findstring tsan,$(D)))
> +  DEBUG_CFLAGS_INTERNAL += -fsanitize=thread -fPIE
> +  LD_FLAGS += -fsanitize=thread -ltsan -pie

Why do you need to set PIE here? Is is necessary for tsan?

> +endif
> +
>  ifneq (,$(findstring ubsan,$(D)))
>    DEBUG_CFLAGS_INTERNAL += -fsanitize=undefined
>  endif
> -- 
> 2.13.2.932.g7449e964c-goog
> 
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