Mitch Phillips 5f0f4e3ae0 [GWP-ASan] Mutex implementation [2]. ... Summary: See D60593 for further information. This patch pulls out the mutex implementation and the required definitions file. We implement our own mutex for GWP-ASan currently, because: 1. We must be compatible with the sum of the most restrictive elements of the supporting allocator's build system. Current targets for GWP-ASan include Scudo (on Linux and Fuchsia), and bionic (on Android). 2. Scudo specifies `-nostdlib++ -nonodefaultlibs`, meaning we can't use `std::mutex` or `mtx_t`. 3. We can't use `sanitizer_common`'s mutex, as the supporting allocators cannot afford the extra maintenance (Android, Fuchsia) and code size (Fuchsia) overheads that this would incur. In future, we would like to implement a shared base mutex for GWP-ASan, Scudo and sanitizer_common. This will likely happen when both GWP-ASan and Scudo standalone are not in the development phase, at which point they will have stable requirements. Reviewers: vlad.tsyrklevich, morehouse, jfb Reviewed By: morehouse Subscribers: dexonsmith, srhines, cfe-commits, kubamracek, mgorny, cryptoad, jfb, #sanitizers, llvm-commits, vitalybuka, eugenis Tags: #sanitizers, #llvm, #clang Differential Revision: https://reviews.llvm.org/D61923 llvm-svn: 362138		2019-05-30 19:45:32 +00:00
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CMakeLists.txt	[GWP-ASan] Mutex implementation [2].	2019-05-30 19:45:32 +00:00