## LibraryPath

# Enum LibraryPath

Source

    pub enum LibraryPath {
        CargoArtifact(PathBuf),
        External(PathBuf),
    }

Expand description

Represents a path added to the library search path.

We need to keep track of requests to add search paths within the cargo build directory separately from paths outside of Cargo. The reason is that we want to give precedence to linking against libraries within the Cargo build directory even if a similar library exists in the system (e.g. crate A adds `/usr/lib` to the search path and then a later build of crate B adds `target/debug/...` to satisfy its request to link against the library B that it built, but B is also found in `/usr/lib`).

There’s some nuance here because we want to preserve relative order of paths of the same type. For example, if the build process would in declaration order emit the following linker line:

    -L/usr/lib -Ltarget/debug/build/crate1/libs -L/lib -Ltarget/debug/build/crate2/libs)

we want the linker to actually receive:

    -Ltarget/debug/build/crate1/libs -Ltarget/debug/build/crate2/libs) -L/usr/lib -L/lib

so that the library search paths within the crate artifacts directory come first but retain relative ordering while the system library paths come after while still retaining relative ordering among them; ordering is the order they are emitted within the build process, not lexicographic order.

WARNING: Even though this type implements PartialOrd + Ord, this is a lexicographic ordering. The linker line will require an explicit sorting algorithm. PartialOrd + Ord is derived because BuildOutput requires it but that ordering is different from the one for the linker search path, at least today. It may be worth reconsidering & perhaps it’s ok if BuildOutput doesn’t have a lexicographic ordering for the library_paths? I’m not sure the consequence of that.

## Variants§

§

### CargoArtifact(PathBuf)

The path is pointing within the output folder of the crate and takes priority over external paths when passed to the linker.

§

### External(PathBuf)

The path is pointing outside of the crate’s build location. The linker will always receive such paths after `CargoArtifact`.

## Implementations§

Source§

### impl LibraryPath

Source

#### fn new(p: PathBuf, script_out_dir: &Path) -> Self

Source

#### pub fn into_path_buf(self) -> PathBuf

## Trait Implementations§

Source§

### impl AsRef<PathBuf> for LibraryPath

Source§

#### fn as_ref(&self) -> &PathBuf

Converts this type into a shared reference of the (usually inferred) input type.
Source§

### impl Clone for LibraryPath

Source§

#### fn clone(&self) -> LibraryPath

Returns a duplicate of the value. Read more
1.0.0 · Source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
Source§

### impl Debug for LibraryPath

Source§

#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
Source§

### impl Hash for LibraryPath

Source§

#### fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given `Hasher`. Read more
1.3.0 · Source§

#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
Source§

### impl Ord for LibraryPath

Source§

#### fn cmp(&self, other: &LibraryPath) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
1.21.0 · Source§

#### fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · Source§

#### fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · Source§

#### fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
Source§

### impl PartialEq for LibraryPath

Source§

#### fn eq(&self, other: &LibraryPath) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · Source§

#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
Source§

### impl PartialOrd for LibraryPath

Source§

#### fn partial_cmp(&self, other: &LibraryPath) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
1.0.0 · Source§

#### fn lt(&self, other: &Rhs) -> bool

Tests less than (for `self` and `other`) and is used by the `<` operator. Read more
1.0.0 · Source§

#### fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
1.0.0 · Source§

#### fn gt(&self, other: &Rhs) -> bool

Tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
1.0.0 · Source§

#### fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
Source§

### impl Eq for LibraryPath

Source§

### impl StructuralPartialEq for LibraryPath

## Auto Trait Implementations§

§

### impl Freeze for LibraryPath

§

### impl RefUnwindSafe for LibraryPath

§

### impl Send for LibraryPath

§

### impl Sync for LibraryPath

§

### impl Unpin for LibraryPath

§

### impl UnwindSafe for LibraryPath

## Blanket Implementations§

Source§

### impl<T> Any for T
where T: 'static + ?Sized,

Source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
Source§

### impl<T> Borrow<T> for T
where T: ?Sized,

Source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

### impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

### impl<T> CloneToUninit for T
where T: Clone,

Source§

#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
§

### impl<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

§

#### fn compare(&self, key: &K) -> Ordering

Compare self to `key` and return their ordering.
§

### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.
§

### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

#### fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
Source§

### impl<T> From<T> for T

Source§

#### fn from(t: T) -> T

Returns the argument unchanged.

§

### impl<T> Instrument for T

§

#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [`Span`], returning an `Instrumented` wrapper. Read more
§

#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
Source§

### impl<T, U> Into<U> for T
where U: From<T>,

Source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

Source§

### impl<T> IntoEither for T

Source§

#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
Source§

#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
§

### impl<T> Pointable for T

§

#### const ALIGN: usize

The alignment of pointer.
§

#### type Init = T

The type for initializers.
§

#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
§

#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
§

#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
§

#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
Source§

### impl<T> Same for T

Source§

#### type Output = T

Should always be `Self`
Source§

### impl<T> ToOwned for T
where T: Clone,

Source§

#### type Owned = T

The resulting type after obtaining ownership.
Source§

#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
Source§

#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
Source§

### impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

#### type Error = Infallible

The type returned in the event of a conversion error.
Source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
§

### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

#### fn vzip(self) -> V

§

### impl<T> WithSubscriber for T

§

#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a [`WithDispatch`] wrapper. Read more
§

#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a [`WithDispatch`] wrapper. Read more
§

### impl<T> ErasedDestructor for T
where T: 'static,

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes

Size for each variant:

- `CargoArtifact`: 24 bytes
- `External`: 24 bytes