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Check build target supports std when building with -Zbuild-std=std #14183

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Check build target supports std when building with -Zbuild-std=std #14183

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Commits on Jul 3, 2024

  1. Check build target supports std when building with -Zbuild-std=std 

    Running cargo with "-Zbuild-std=std" should check whether the build
target supports building the standard library. This information can be
obtained from rustc with the target-spec-json "--print" option. When
'std' is false for the build target, cargo should not attempt to build
the standard library.

This avoids the "use of unstable library" errors, as this check is
performed before Cargo starts trying to build restricted_std code.
    @harmou01
    harmou01 committed Jul 3, 2024
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  2. test(cfg): parse rustc --print=target-spec-json

    @harmou01
    harmou01 committed Jul 3, 2024
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  3. Add new test case 'test_std_on_unsupported_target' 

    Add a new test case to check cargo handles building a target which
doesn't support the standard library properly.
    @harmou01
    harmou01 committed Jul 3, 2024
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