[PATCH] Make the presence of stdin and stdout optional

[Ed Schouten]

In http://reviews.llvm.org/D8340#142113, @mclow.lists wrote:

> Or does CloudABI support `stderr`?


Yes, only `stderr`. For a service, `stdin` and `stdout` make little sense, whereas `stderr` can still be used for logging. For example, `assert()` will log its diagnostics to `stderr`.


http://reviews.llvm.org/D8340

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