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a3e4fd51f1
The original `ExecuteCommand()` called `system()` from the C library. The C library implementation of this on macOS contains a mutex which serializes calls to `system()`. This prevented the `-jobs=` flag from running copies of the fuzzing binary in parallel which is the opposite of what is intended. To fix this on macOS an alternative implementation of `ExecuteCommand()` is provided that can be used concurrently. This is provided in `FuzzerUtilDarwin.cpp` which is guarded to only compile code on Apple platforms. The existing implementation has been moved to a new file `FuzzerUtilLinux.cpp` which is guarded to only compile code on Linux. This commit includes a simple test to check that LibFuzzer is being executed in parallel when requested. Differential Revision: https://reviews.llvm.org/D22742 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278544 91177308-0d34-0410-b5e6-96231b3b80d8
Move to http://llvm.org/docs/LibFuzzer.html