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Add build support for Cargo's build-std feature. #74033

Merged
merged 7 commits into from Jul 17, 2020
Merged

Add build support for Cargo's build-std feature. #74033

merged 7 commits into from Jul 17, 2020

Commits on Jul 15, 2020

  1. Automatically calculate std::env::consts::ARCH. 

    This simplifies the definition for ARCH.

Note that this changes asmjs-unknown-emscripten ARCH to `wasm32`,
which reflects the actual target arch.
    @ehuss
    ehuss committed Jul 15, 2020
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  2. Use cfg_if in libtest. 

    Simplifies some of the expressions, and provides a default.
    @ehuss
    ehuss committed Jul 15, 2020
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  3. Use cfg_if in libpanic_abort. 

    This allows setting a default abort using the core intrinsic.
    @ehuss
    ehuss committed Jul 15, 2020
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  4. Introduce restricted-std feature.

    @ehuss
    ehuss committed Jul 15, 2020
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  5. Tweak formatting.

    @ehuss
    ehuss committed Jul 15, 2020
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  6. Use an allow-list of platforms that support std. 

    Use a fall-through for no_std targets.
    @ehuss
    ehuss committed Jul 15, 2020
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  7. Simplify os_str_bytes cfg expression.

    @ehuss
    ehuss committed Jul 15, 2020
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