[FuzzerUtil] Partially revert D38481 on FuzzerUtil This is because lib/Fuzzer doesn't really depend on llvm infrastucture. It's not easy to access the llvm hardware_concurrency here. Differential Reivision: https://reviews.llvm.org/D38481 git-svn-id: svn://svn.chromium.org/llvm-project/llvm/trunk/lib/Fuzzer@314870 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
diff --git a/FuzzerUtil.cpp b/FuzzerUtil.cpp index 5f76ddc..f5a7773 100644 --- a/FuzzerUtil.cpp +++ b/FuzzerUtil.cpp
@@ -195,7 +195,15 @@ Printf(FallbackFMT, PC); } -unsigned NumberOfCpuCores() { return hardware_concurrency(); } +unsigned NumberOfCpuCores() { + unsigned N = std::thread::hardware_concurrency(); + if (!N) { + Printf("WARNING: std::thread::hardware_concurrency not well defined for " + "your platform. Assuming CPU count of 1.\n"); + N = 1; + } + return N; +} size_t SimpleFastHash(const uint8_t *Data, size_t Size) { size_t Res = 0; 