## LibraryPath

# Enum LibraryPath

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    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§

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### CargoArtifact(PathBuf)

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

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### External(PathBuf)

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

## Implementations§

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### impl LibraryPath

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

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

## Trait Implementations§

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### impl AsRef<PathBuf> for LibraryPath

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

Converts this type into a shared reference of the (usually inferred) input type.
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### impl Clone for LibraryPath

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#### 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
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### impl Debug for LibraryPath

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

Formats the value using the given formatter. Read more
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### impl Hash for LibraryPath

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

Feeds this value into the given `Hasher`. Read more
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#### 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
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### impl Ord for LibraryPath

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

Compares and returns the minimum of two values. Read more
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#### fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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### impl PartialEq for LibraryPath

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

Tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialOrd for LibraryPath

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

This method returns an ordering between `self` and `other` values if one exists. Read more
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#### fn lt(&self, other: &Rhs) -> bool

Tests less than (for `self` and `other`) and is used by the `<` operator. Read more
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#### fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
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#### fn gt(&self, other: &Rhs) -> bool

Tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
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#### fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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### impl Eq for LibraryPath

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### impl StructuralPartialEq for LibraryPath

## Auto Trait Implementations§

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### impl Freeze for LibraryPath

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### impl RefUnwindSafe for LibraryPath

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### impl Send for LibraryPath

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### impl Sync for LibraryPath

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### impl Unpin for LibraryPath

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### impl UnwindSafe for LibraryPath

## Blanket Implementations§

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

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

Gets the `TypeId` of `self`. Read more
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where T: ?Sized,

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Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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where T: Clone,

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

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

Compare self to `key` and return their ordering.
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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Checks if this value is equivalent to the given key. Read more
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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

Compare self to `key` and return `true` if they are equal.
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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

Checks if this value is equivalent to the given key. Read more
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#### fn from(t: T) -> T

Returns the argument unchanged.

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

Instruments this type with the provided [`Span`], returning an `Instrumented` wrapper. Read more
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Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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where U: From<T>,

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Calls `U::from(self)`.

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

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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
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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
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### impl<T> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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The type for initializers.
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Initializes a with the given initializer. Read more
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Dereferences the given pointer. Read more
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where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a [`WithDispatch`] wrapper. Read more
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### impl<T> ErasedDestructor for T
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## 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