[PATCH] D41316: [libcxx] Allow random_device to be built optionally

[Eli Friedman via Phabricator via cfe-commits]

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A very similar patch was merged in e0d01294bc124211a8ffb55e69162eb34a242680 <https://reviews.llvm.org/rGe0d01294bc124211a8ffb55e69162eb34a242680> .


Repository:
  rCXX libc++

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  https://reviews.llvm.org/D41316/new/

https://reviews.llvm.org/D41316