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Fix broken STD build for ESP-IDF #147213
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            Fix broken STD build for ESP-IDF #147213
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           @bors r+ rollup  | 
    
    
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Rollup of 11 pull requests Successful merges: - #146918 (add regression test) - #146980 (simplify setup_constraining_predicates, and note it is potentially cubic) - #147170 (compiletest: Pass around `DirectiveLine` instead of bare strings) - #147180 (add tests) - #147188 (Remove usage of `compiletest-use-stage0-libtest` from CI) - #147189 (Replace `rustc_span::Span` with a stripped down version for librustdoc's highlighter) - #147199 (remove outdated comment in (inner) `InferCtxt`) - #147200 (Fix autodiff empty ret regression) - #147209 (Remove `no-remap-src-base` from tests) - #147213 (Fix broken STD build for ESP-IDF) - #147217 (Don't create a top-level `true` directory when running UI tests) r? `@ghost` `@rustbot` modify labels: rollup
    
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Rollup merge of #147213 - ivmarkov:fix-hostname-espidf, r=joboet Fix broken STD build for ESP-IDF PRs #147162 and #146937 did [broke](https://github.com/esp-rs/esp-idf-sys/actions/runs/18151791720/job/51663969786) the STD build for `target_os = "espidf"` because that target [does not have neither a `gethostname`, not a `libc::_SC_HOST_NAME_MAX` by default](espressif/esp-idf#14849). While there is a [3rd party component for this syscall](https://components.espressif.com/components/espressif/sock_utils/versions/0.2.2/readme) in the ESP-IDF component registry, I don't think we should use it, because it does not come with ESP-IDF by default. Therefore, the one-liner fix just re-routes ESP-IDF into the `unsupported` branch.
    
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…boet Fix broken STD build for ESP-IDF PRs rust-lang#147162 and rust-lang#146937 did [broke](https://github.com/esp-rs/esp-idf-sys/actions/runs/18151791720/job/51663969786) the STD build for `target_os = "espidf"` because that target [does not have neither a `gethostname`, not a `libc::_SC_HOST_NAME_MAX` by default](espressif/esp-idf#14849). While there is a [3rd party component for this syscall](https://components.espressif.com/components/espressif/sock_utils/versions/0.2.2/readme) in the ESP-IDF component registry, I don't think we should use it, because it does not come with ESP-IDF by default. Therefore, the one-liner fix just re-routes ESP-IDF into the `unsupported` branch.
  
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PRs #147162 and #146937 did broke the STD build for
target_os = "espidf"because that target does not have neither agethostname, not alibc::_SC_HOST_NAME_MAXby default.While there is a 3rd party component for this syscall in the ESP-IDF component registry, I don't think we should use it, because it does not come with ESP-IDF by default.
Therefore, the one-liner fix just re-routes ESP-IDF into the
unsupportedbranch.