options/dep: introduce --output_deps_to #2932
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This is to avoid printing the dependencies to stdout, which 1) can be brittle on careless Makefiles, as even a failing invocation will create the .depend file when an output redirection is used 2) is inconvient when debugging, as the the debug output will get mixed the actual dependency output. This new behavior is opt-in, the old behavior is preserved when the option is not provided.
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This is to avoid printing the dependencies to stdout, which
will create the .depend file when an output redirection is used
mixed the actual dependency output.
This new behavior is opt-in, the old behavior is preserved when the
option is not provided.