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<h1 id="minicore-test-auxiliary-using-core-stubs"><a class="header" href="#minicore-test-auxiliary-using-core-stubs"><code>minicore</code> test auxiliary: using <code>core</code> stubs</a></h1>
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<!-- date-check Oct 2024 -->
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<p><a href="https://github.com/rust-lang/rust/tree/master/tests/auxiliary/minicore.rs"><code>tests/auxiliary/minicore.rs</code></a> is a test auxiliary for
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ui/codegen/assembly test suites. It provides <code>core</code> stubs for tests that need to
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build for cross-compiled targets but do not need/want to run.</p>
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<div class="warning">
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<p>Please note that <a href="https://github.com/rust-lang/rust/tree/master/tests/auxiliary/minicore.rs"><code>minicore</code></a> is only intended for <code>core</code> items, and explicitly
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<strong>not</strong> <code>std</code> or <code>alloc</code> items because <code>core</code> items are applicable to a wider
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range of tests.</p>
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</div>
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<p>A test can use <a href="https://github.com/rust-lang/rust/tree/master/tests/auxiliary/minicore.rs"><code>minicore</code></a> by specifying the <code>//@ add-core-stubs</code> directive.
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Then, mark the test with <code>#![feature(no_core)]</code> + <code>#![no_std]</code> + <code>#![no_core]</code>.
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Due to Edition 2015 extern prelude rules, you will probably need to declare
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<code>minicore</code> as an extern crate.</p>
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<h2 id="implied-compiler-flags"><a class="header" href="#implied-compiler-flags">Implied compiler flags</a></h2>
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<p>Due to the <code>no_std</code> + <code>no_core</code> nature of these tests, <code>//@ add-core-stubs</code>
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implies and requires that the test will be built with <code>-C panic=abort</code>.
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<strong>Unwinding panics are not supported.</strong></p>
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<p>Tests will also be built with <code>-C force-unwind-tables=yes</code> to preserve CFI
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directives in assembly tests.</p>
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<p>TL;DR: <code>//@ add-core-stubs</code> implies two compiler flags:</p>
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<ol>
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<li><code>-C panic=abort</code></li>
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<li><code>-C force-unwind-tables=yes</code></li>
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</ol>
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<h2 id="adding-more-core-stubs"><a class="header" href="#adding-more-core-stubs">Adding more <code>core</code> stubs</a></h2>
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<p>If you find a <code>core</code> item to be missing from the <a href="https://github.com/rust-lang/rust/tree/master/tests/auxiliary/minicore.rs"><code>minicore</code></a> stub, consider
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adding it to the test auxiliary if it's likely to be used or is already needed
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by more than one test.</p>
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<h2 id="example-codegen-test-that-uses-minicore"><a class="header" href="#example-codegen-test-that-uses-minicore">Example codegen test that uses <code>minicore</code></a></h2>
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<pre><pre class="playground"><code class="language-rust no_run"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>//@ add-core-stubs
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//@ revisions: meow bark
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//@[meow] compile-flags: --target=x86_64-unknown-linux-gnu
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//@[meow] needs-llvm-components: x86
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//@[bark] compile-flags: --target=wasm32-unknown-unknown
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//@[bark] needs-llvm-components: webassembly
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#![crate_type = "lib"]
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#![feature(no_core)]
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#![no_std]
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#![no_core]
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extern crate minicore;
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use minicore::*;
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struct Meow;
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impl Copy for Meow {} // `Copy` here is provided by `minicore`
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// CHECK-LABEL: meow
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#[unsafe(no_mangle)]
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fn meow() {}
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<span class="boring">}</span></code></pre></pre>
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