diff --git a/compiler/rustc_lint/src/context/diagnostics.rs b/compiler/rustc_lint/src/context/diagnostics.rs index eb42730f69a4d..0fa61c5d87e77 100644 --- a/compiler/rustc_lint/src/context/diagnostics.rs +++ b/compiler/rustc_lint/src/context/diagnostics.rs @@ -188,6 +188,23 @@ pub(super) fn builtin( #[allow(rustc::potential_query_instability)] let possibilities: Vec = sess.parse_sess.check_config.expecteds.keys().copied().collect(); + + let mut names_possibilities: Vec<_> = if value.is_none() { + // We later sort and display all the possibilities, so the order here does not matter. + #[allow(rustc::potential_query_instability)] + sess.parse_sess + .check_config + .expecteds + .iter() + .filter_map(|(k, v)| match v { + ExpectedValues::Some(v) if v.contains(&Some(name)) => Some(k), + _ => None, + }) + .collect() + } else { + Vec::new() + }; + let is_from_cargo = std::env::var_os("CARGO").is_some(); let mut is_feature_cfg = name == sym::feature; @@ -262,17 +279,30 @@ pub(super) fn builtin( } is_feature_cfg |= best_match == sym::feature; - } else if !possibilities.is_empty() { - let mut possibilities = - possibilities.iter().map(Symbol::as_str).collect::>(); - possibilities.sort(); - let possibilities = possibilities.join("`, `"); + } else { + if !names_possibilities.is_empty() && names_possibilities.len() <= 3 { + names_possibilities.sort(); + for cfg_name in names_possibilities.iter() { + db.span_suggestion( + name_span, + "found config with similar value", + format!("{cfg_name} = \"{name}\""), + Applicability::MaybeIncorrect, + ); + } + } + if !possibilities.is_empty() { + let mut possibilities = + possibilities.iter().map(Symbol::as_str).collect::>(); + possibilities.sort(); + let possibilities = possibilities.join("`, `"); - // The list of expected names can be long (even by default) and - // so the diagnostic produced can take a lot of space. To avoid - // cloging the user output we only want to print that diagnostic - // once. - db.help_once(format!("expected names are: `{possibilities}`")); + // The list of expected names can be long (even by default) and + // so the diagnostic produced can take a lot of space. To avoid + // cloging the user output we only want to print that diagnostic + // once. + db.help_once(format!("expected names are: `{possibilities}`")); + } } let inst = if let Some((value, _value_span)) = value { diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.rs b/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.rs new file mode 100644 index 0000000000000..a6e68e1b7101c --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.rs @@ -0,0 +1,12 @@ +// #120427 +// This test checks we won't suggest more than 3 span suggestions for cfg names +// +// check-pass +// compile-flags: -Z unstable-options +// compile-flags: --check-cfg=cfg(foo,values("value")) --check-cfg=cfg(bar,values("value")) --check-cfg=cfg(bee,values("value")) --check-cfg=cfg(cow,values("value")) + +#[cfg(value)] +//~^ WARNING unexpected `cfg` condition name: `value` +fn x() {} + +fn main() {} diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr b/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr new file mode 100644 index 0000000000000..82d471d715b83 --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr @@ -0,0 +1,13 @@ +warning: unexpected `cfg` condition name: `value` + --> $DIR/cfg-value-for-cfg-name-duplicate.rs:8:7 + | +LL | #[cfg(value)] + | ^^^^^ + | + = help: expected names are: `bar`, `bee`, `cow`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows` + = help: to expect this configuration use `--check-cfg=cfg(value)` + = note: see for more information about checking conditional configuration + = note: `#[warn(unexpected_cfgs)]` on by default + +warning: 1 warning emitted + diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.rs b/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.rs new file mode 100644 index 0000000000000..edde6244ed1a9 --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.rs @@ -0,0 +1,12 @@ +// #120427 +// This test checks that when a single cfg has a value for user's specified name +// +// check-pass +// compile-flags: -Z unstable-options +// compile-flags: --check-cfg=cfg(foo,values("my_value")) --check-cfg=cfg(bar,values("my_value")) + +#[cfg(my_value)] +//~^ WARNING unexpected `cfg` condition name: `my_value` +fn x() {} + +fn main() {} diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.stderr b/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.stderr new file mode 100644 index 0000000000000..b88ee71a156a2 --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.stderr @@ -0,0 +1,21 @@ +warning: unexpected `cfg` condition name: `my_value` + --> $DIR/cfg-value-for-cfg-name-multiple.rs:8:7 + | +LL | #[cfg(my_value)] + | ^^^^^^^^ + | + = help: expected names are: `bar`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows` + = help: to expect this configuration use `--check-cfg=cfg(my_value)` + = note: see for more information about checking conditional configuration + = note: `#[warn(unexpected_cfgs)]` on by default +help: found config with similar value + | +LL | #[cfg(foo = "my_value")] + | ~~~~~~~~~~~~~~~~ +help: found config with similar value + | +LL | #[cfg(bar = "my_value")] + | ~~~~~~~~~~~~~~~~ + +warning: 1 warning emitted + diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name.rs b/tests/ui/check-cfg/cfg-value-for-cfg-name.rs new file mode 100644 index 0000000000000..7a0c345b7ca76 --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name.rs @@ -0,0 +1,18 @@ +// #120427 +// This test checks that when a single cfg has a value for user's specified name +// suggest to use `#[cfg(target_os = "linux")]` instead of `#[cfg(linux)]` +// +// check-pass +// compile-flags: -Z unstable-options +// compile-flags: --check-cfg=cfg() + +#[cfg(linux)] +//~^ WARNING unexpected `cfg` condition name: `linux` +fn x() {} + +// will not suggest if the cfg has a value +#[cfg(linux = "os-name")] +//~^ WARNING unexpected `cfg` condition name: `linux` +fn y() {} + +fn main() {} diff --git a/tests/ui/check-cfg/cfg-value-for-cfg-name.stderr b/tests/ui/check-cfg/cfg-value-for-cfg-name.stderr new file mode 100644 index 0000000000000..c044755142419 --- /dev/null +++ b/tests/ui/check-cfg/cfg-value-for-cfg-name.stderr @@ -0,0 +1,22 @@ +warning: unexpected `cfg` condition name: `linux` + --> $DIR/cfg-value-for-cfg-name.rs:9:7 + | +LL | #[cfg(linux)] + | ^^^^^ help: found config with similar value: `target_os = "linux"` + | + = help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows` + = help: to expect this configuration use `--check-cfg=cfg(linux)` + = note: see for more information about checking conditional configuration + = note: `#[warn(unexpected_cfgs)]` on by default + +warning: unexpected `cfg` condition name: `linux` + --> $DIR/cfg-value-for-cfg-name.rs:14:7 + | +LL | #[cfg(linux = "os-name")] + | ^^^^^^^^^^^^^^^^^ + | + = help: to expect this configuration use `--check-cfg=cfg(linux, values("os-name"))` + = note: see for more information about checking conditional configuration + +warning: 2 warnings emitted +