Struct LinkerFeatures 

pub struct LinkerFeatures(InternalBitFlags);

The -C linker-features components that can individually be enabled or disabled.

They are feature flags intended to be a more flexible mechanism than linker flavors, and also to prevent a combinatorial explosion of flavors whenever a new linker feature is required. These flags are “generic”, in the sense that they can work on multiple targets on the CLI. Otherwise, one would have to select different linkers flavors for each target.

Here are some examples of the advantages they offer:

• default feature sets for principal flavors, or for specific targets.
• flavor-specific features: for example, clang offers automatic cross-linking with --target, which gcc-style compilers don’t support. The flavor is still a C/C++ compiler, and we don’t need to multiply the number of flavors for this use-case. Instead, we can have a single +target feature.
• umbrella features: for example if clang accumulates more features in the future than just the +target above. That could be modeled as +clang.
• niche features for resolving specific issues: for example, on Apple targets the linker flag implementing the as-needed native link modifier (#99424) is only possible on sufficiently recent linker versions.
• still allows for discovery and automation, for example via feature detection. This can be useful in exotic environments/build systems.

Tuple Fields

0: InternalBitFlags

Implementations

impl LinkerFeatures

pub const CC: Self

Invoke the linker via a C/C++ compiler (e.g. on most unix targets).

pub const LLD: Self

Use the lld linker, either the system lld or the self-contained linker rust-lld.

impl LinkerFeatures

pub const fn empty() -> Self

Get a flags value with all bits unset.

pub const fn all() -> Self

Get a flags value with all known bits set.

pub const fn bits(&self) -> u8

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u8) -> Option<Self>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u8) -> Self

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u8) -> Self

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: Self) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: Self) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: Self, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl LinkerFeatures

pub const fn iter(&self) -> Iter<LinkerFeatures>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<LinkerFeatures>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

impl LinkerFeatures

pub fn from_str(s: &str) -> Option<LinkerFeatures>

Parses a single -C linker-features well-known feature, not a set of flags.

pub fn as_str(self) -> Option<&'static str>

Return the linker feature name, as would be passed on the CLI.

Returns None if the bitflags aren’t a singular component (but a mix of multiple flags).

pub fn is_lld_enabled(self) -> bool

Returns whether the lld linker feature is enabled.

pub fn is_cc_enabled(self) -> bool

Returns whether the cc linker feature is enabled.

Trait Implementations

impl Binary for LinkerFeatures

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

Formats the value using the given formatter.

impl BitAnd for LinkerFeatures

fn bitand(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

type Output = LinkerFeatures

The resulting type after applying the & operator.

impl BitAndAssign for LinkerFeatures

fn bitand_assign(&mut self, other: Self)

The bitwise and (&) of the bits in two flags values.

impl BitOr for LinkerFeatures

fn bitor(self, other: LinkerFeatures) -> Self

The bitwise or (|) of the bits in two flags values.

type Output = LinkerFeatures

The resulting type after applying the | operator.

impl BitOrAssign for LinkerFeatures

fn bitor_assign(&mut self, other: Self)

The bitwise or (|) of the bits in two flags values.

impl BitXor for LinkerFeatures

fn bitxor(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = LinkerFeatures

The resulting type after applying the ^ operator.

impl BitXorAssign for LinkerFeatures

fn bitxor_assign(&mut self, other: Self)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for LinkerFeatures

fn clone(&self) -> LinkerFeatures

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LinkerFeatures

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

Formats the value using the given formatter.

impl Default for LinkerFeatures

fn default() -> LinkerFeatures

Returns the “default value” for a type.

impl Extend<LinkerFeatures> for LinkerFeatures

fn extend<T: IntoIterator<Item = Self>>(&mut self, iterator: T)

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for LinkerFeatures

const FLAGS: &'static [Flag<LinkerFeatures>]

The set of defined flags.

type Bits = u8

The underlying bits type.

fn bits(&self) -> u8

Get the underlying bits value.

fn from_bits_retain(bits: u8) -> LinkerFeatures

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn contains_unknown_bits(&self) -> bool

This method will return true if any unknown bits are set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn truncate(&mut self)

where Self: Sized,

Remove any unknown bits from the flags.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

fn clear(&mut self)

where Self: Sized,

Unsets all bits in the flags.

fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromIterator<LinkerFeatures> for LinkerFeatures

fn from_iter<T: IntoIterator<Item = Self>>(iterator: T) -> Self

The bitwise or (|) of the bits in each flags value.

impl IntoIterator for LinkerFeatures

type Item = LinkerFeatures

The type of the elements being iterated over.

type IntoIter = Iter<LinkerFeatures>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl LowerHex for LinkerFeatures

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

Formats the value using the given formatter.

impl Not for LinkerFeatures

fn not(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = LinkerFeatures

The resulting type after applying the ! operator.

impl Octal for LinkerFeatures

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

Formats the value using the given formatter.

impl PartialEq for LinkerFeatures

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PublicFlags for LinkerFeatures

type Primitive = u8

The type of the underlying storage.

type Internal = InternalBitFlags

The type of the internal field on the generated flags type.

impl Sub for LinkerFeatures

fn sub(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = LinkerFeatures

The resulting type after applying the - operator.

impl SubAssign for LinkerFeatures

fn sub_assign(&mut self, other: Self)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl UpperHex for LinkerFeatures

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

Formats the value using the given formatter.

impl Copy for LinkerFeatures

impl Eq for LinkerFeatures

impl StructuralPartialEq for LinkerFeatures

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: 1 byte