[Patch] use __BLOCKS__ in asan_mac.cc to detect blocks availability

[Alexander Potapenko]

Are there situations when blocks support is missing in Clang?
On Oct 11, 2013 1:43 AM, "Iain Sandoe" <iain at codesourcery.com> wrote:

> Hi,
>
> I found today (on OSX10.8) that with cmake using gcc-4.8 as the bootstrap
> I was getting a fail building asan-mac.cc, related to use of blocks syntax.
>  The same checkout builds fine using autoconf/make.
>
> In asan-mac.cc, availability of blocks is currently tested by
> !defined(MISSING_BLOCKS_SUPPORT) - which is apparently not set in the cmake
> process - the attached trivial patch changes this to use
> "defined(__BLOCKS__)" instead.
>
> The same checkout now builds with both gcc-4.8 and clang for both 'cmake'
> and 'configure' (LLVM, clang and compiler-rt).
>
> Iain
>
>
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