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Rollup merge of #105791 - Ezrashaw:add-e0472-long-docs, r=GuillaumeGomez

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docs: add long error explanation for error E0472

Add long-form error docs for E0472: "inline assembly not supported on this target" and update UI tests.

R? `@GuillaumeGomez`
This commit is contained in:
Matthias Krüger 2022-12-20 23:35:14 +01:00 • committed by GitHub
commit 4726e514d7
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4 changed files with 34 additions and 1 deletions
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2
compiler/rustc_error_codes/src/error_codes.rs
View file

@ -249,6 +249,7 @@ E0464: include_str!("./error_codes/E0464.md"),
E0466: include_str!("./error_codes/E0466.md"),
E0468: include_str!("./error_codes/E0468.md"),
E0469: include_str!("./error_codes/E0469.md"),
E0472: include_str!("./error_codes/E0472.md"),
E0477: include_str!("./error_codes/E0477.md"),
E0478: include_str!("./error_codes/E0478.md"),
E0482: include_str!("./error_codes/E0482.md"),
@ -599,7 +600,6 @@ E0791: include_str!("./error_codes/E0791.md"),
// E0467, // removed
// E0470, // removed
// E0471, // constant evaluation error (in pattern)
E0472, // llvm_asm! is unsupported on this target
// E0473, // dereference of reference outside its lifetime
// E0474, // captured variable `..` does not outlive the enclosing closure
// E0475, // index of slice outside its lifetime

31
compiler/rustc_error_codes/src/error_codes/E0472.md Normal file
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@ -0,0 +1,31 @@
Inline assembly (`asm!`) is not supported on this target.
Example of erroneous code:
```ignore (cannot-change-target)
// compile-flags: --target sparc64-unknown-linux-gnu
#![no_std]
use core::arch::asm;
fn main() {
unsafe {
asm!(""); // error: inline assembly is not supported on this target
}
}
```
The Rust compiler does not support inline assembly, with the `asm!` macro
(previously `llvm_asm!`), for all targets. All Tier 1 targets do support this
macro but support among Tier 2 and 3 targets is not guaranteed (even when they
have `std` support). Note that this error is related to
`error[E0658]: inline assembly is not stable yet on this architecture`, but
distinct in that with `E0472` support is not planned or in progress.
There is no way to easily fix this issue, however:
* Consider if you really need inline assembly, is there some other way to
achieve your goal (intrinsics, etc)?
* Consider writing your assembly externally, linking with it and calling it
from Rust.
* Consider contributing to <https://github.com/rust-lang/rust> and help
integrate support for your target!