Respect -o output file in --print#110785
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dtolnay wants to merge 8 commits intorust-lang:masterfrom
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Previously something like
rustc --print=cfg -o cfg.txtjust ignored the-ooption and would print to stdout as usual.File output simplifies integration in non-Cargo build systems — in my case Buck2. With this PR we get to skip a layer of Python wrapper or Bash wrapper to redirect rustc's stdout into the location dictated by the build system.