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Suggest x build library for a custom toolchain that fails to load core #113259

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Merged
merged 1 commit into from
Jul 3, 2023
Merged

Suggest x build library for a custom toolchain that fails to load core #113259

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3 changes: 3 additions & 0 deletions compiler/rustc_metadata/messages.ftl
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Expand Up @@ -25,6 +25,9 @@ metadata_conflicting_alloc_error_handler =
metadata_conflicting_global_alloc =
the `#[global_allocator]` in {$other_crate_name} conflicts with global allocator in: {$crate_name}
metadata_consider_adding_std =
consider adding the standard library to the sysroot with `x build library --target {$locator_triple}`
metadata_consider_building_std =
consider building the standard library from source with `cargo build -Zbuild-std`
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14 changes: 10 additions & 4 deletions compiler/rustc_metadata/src/errors.rs
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Expand Up @@ -646,12 +646,18 @@ impl IntoDiagnostic<'_> for CannotFindCrate {
} else {
diag.note(fluent::metadata_target_no_std_support);
}
// NOTE: this suggests using rustup, even though the user may not have it installed.
// That's because they could choose to install it; or this may give them a hint which
// target they need to install from their distro.

if self.missing_core {
diag.help(fluent::metadata_consider_downloading_target);
if env!("CFG_RELEASE_CHANNEL") == "dev" {
diag.help(fluent::metadata_consider_adding_std);
} else {
// NOTE: this suggests using rustup, even though the user may not have it installed.
// That's because they could choose to install it; or this may give them a hint which
// target they need to install from their distro.
diag.help(fluent::metadata_consider_downloading_target);
}
}

// Suggest using #![no_std]. #[no_core] is unstable and not really supported anyway.
// NOTE: this is a dummy span if `extern crate std` was injected by the compiler.
// If it's not a dummy, that means someone added `extern crate std` explicitly and
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