<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `src/libstd/../stdsimd/crates/std_detect/src/detect/error_macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>error_macros.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../../../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../light1.35.0.css" id="themeStyle"><script src="../../../../../../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../../../../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../../../../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../../../../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../../../../../std/index.html'><img src='../../../../../../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../../../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../../../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../../../../../../settings.html"><img src="../../../../../../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! The `is_{target_arch}_feature_detected!` macro are only available on their</span>
<span class="doccomment">//! architecture. These macros provide a better error messages when the user</span>
<span class="doccomment">//! attempts to call them in a different architecture.</span>
<span class="doccomment">/// Prevents compilation if `is_x86_feature_detected` is used somewhere</span>
<span class="doccomment">/// else than `x86` and `x86_64` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>)))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_x86_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_x86_feature_detected can only be used on x86 and x86_64 targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
if is_x86_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_arm_feature_detected` is used somewhere else</span>
<span class="doccomment">/// than `ARM` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"arm"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_arm_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_arm_feature_detected can only be used on ARM targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "arm")] {
if is_arm_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_aarch64_feature_detected` is used somewhere else</span>
<span class="doccomment">/// than `aarch64` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"aarch64"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_aarch64_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_aarch64_feature_detected can only be used on AArch64 targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "aarch64")] {
if is_aarch64_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_powerpc_feature_detected` is used somewhere else</span>
<span class="doccomment">/// than `PowerPC` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"powerpc"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_powerpc_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_powerpc_feature_detected can only be used on PowerPC targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "powerpc")] {
if is_powerpc_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_powerpc64_feature_detected` is used somewhere</span>
<span class="doccomment">/// else than `PowerPC64` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"powerpc64"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_powerpc64_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_powerpc64_feature_detected can only be used on PowerPC64 targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "powerpc64")] {
if is_powerpc64_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_mips_feature_detected` is used somewhere else</span>
<span class="doccomment">/// than `MIPS` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"mips"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_mips_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_mips_feature_detected can only be used on MIPS targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "mips")] {
if is_mips_feature_detected(...) { ... }
}
"#</span>
)
};
}
<span class="doccomment">/// Prevents compilation if `is_mips64_feature_detected` is used somewhere else</span>
<span class="doccomment">/// than `MIPS64` targets.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"mips64"</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27731"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_mips64_feature_detected</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> {
<span class="macro">compile_error</span><span class="macro">!</span>(
<span class="string">r#"
is_mips64_feature_detected can only be used on MIPS64 targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:
#[cfg(target_arch = "mips64")] {
if is_mips64_feature_detected(...) { ... }
}
"#</span>
)
};
}
</pre></div>
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