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03fe46f43b
* Advise porter on where to make necessary change. In #1075 the change was already made for BSD (thank you!); my working edit had this guidance to ensure future porters get an error directing them where to make a necessary change. Otherwise, the FoundationEssentials build will fail and complain these variables are not defined but not have guidance as to where they are sourced from. * OpenBSD does not support extended attributes. * OpenBSD does not have secure_getenv. * Remaining OpenBSD changes. * OpenBSD also needs `pthread_mutex_t?`. * Originally I followed Darwin's check with `d_namlen`, but this should work too. * Correct statvfs type casts for OpenBSD. On OpenBSD, fsblkcnt_t -- the type of f_blocks -- is a UInt64; therefore, so must `blockSize` be. Ultimately, both sides of the `totalSizeBytes` multiplication should probably be type cast for all platforms, but that's a more significant functional change for another time. * Default activeProcessorCount to 1, not 0. After a rather tedious debugging session trying to figure out why swiftpm-bootstrap appeared to be deadlocked, this turned out to be the culprit. Perhaps this should be #error instead, but for now, set a sensible default. * Use sysconf for activeProcessorCount. This is what Dispatch does in some places for OpenBSD anyway, so do likewise here.