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e01aed9846
But now include a check for CPU_COUNT so we still build on 10 year old versions of glibc. Original message: Use sched_getaffinity instead of std:🧵:hardware_concurrency. The issue with std:🧵:hardware_concurrency is that it forwards to libc and some implementations (like glibc) don't take thread affinity into consideration. With this change a llvm program that can execute in only 2 cores will use 2 threads, even if the machine has 32 cores. This makes benchmarking a lot easier, but should also help if someone doesn't want to use all cores for compilation for example. llvm-svn: 314931
See docs/CMake.html for instructions on how to build LLVM with CMake.