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Add -d:nimNoGetEntropy to allow running on macOS earlier than 10.12 #20460

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Add -d:nimNoGetEntropy to allow running on macOS earlier than 10.12 #20460

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8 changes: 6 additions & 2 deletions lib/std/sysrand.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,10 @@
## for targets running kernel version < 3.17) by passing a compile flag of
## `-d:nimNoGetRandom`. If this flag is passed, sysrand will use `/dev/urandom`
## as with any other POSIX compliant OS.
##
## On a macOS target, you can choose to use `/dev/urandom` instead of
## the one from `sys/random.h` by passing `-d:nimNoGetEntropy`. This is
## useful if you are running macOS prior to 10.12.
##

runnableExamples:
Expand All @@ -66,7 +70,7 @@ when defined(nimPreviewSlimSystem):
import std/assertions

const
batchImplOS = defined(freebsd) or defined(openbsd) or defined(zephyr) or (defined(macosx) and not defined(ios))
batchImplOS = defined(freebsd) or defined(openbsd) or defined(zephyr) or (defined(macosx) and not defined(nimNoGetEntropy) and not defined(ios))
batchSize {.used.} = 256

when batchImplOS:
Expand Down Expand Up @@ -254,7 +258,7 @@ elif defined(ios):

result = secRandomCopyBytes(nil, csize_t(size), addr dest[0])

elif defined(macosx):
elif defined(macosx) and not defined(nimNoGetEntropy):
const sysrandomHeader = """#include <Availability.h>
#include <sys/random.h>
"""
Expand Down