Enum LtoJobs 

pub enum LtoJobs {
    One,
    Auto,
    Jobserver,
    Count(u32),
}

How many processes the link time work is spread over, which is what -flto= takes.

Named for the flag rather than for what it counts, because Jobs in the driver is already the answer to how many files are compiled at once and the two numbers are not the same number.

The link time half of link time optimization is where all of the time goes, because it is the half that has the whole program in front of it, and gcc’s answer is to cut the program into pieces and generate code for the pieces at once. This says how many at once.

Variants

One

Bare -flto, and -flto=1. One process, which is what gcc does when the flag is written without a number after it.

Auto

-flto=auto. As many as the machine has, worked out when the link runs.

Jobserver

-flto=jobserver. As many as make is willing to hand out, asked for through the jobserver pipe it puts in the environment, which is the only answer that does not fight with the rest of a parallel build for the same cores.

Count(u32)

-flto=<n>. Exactly that many. gcc refuses a zero, so this is never one.

Trait Implementations

impl Clone for LtoJobs

fn clone(&self) -> LtoJobs

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LtoJobs

impl Debug for LtoJobs

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

Formats the value using the given formatter.

impl Default for LtoJobs

fn default() -> LtoJobs

Returns the “default value” for a type.

impl Display for LtoJobs

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

Formats the value using the given formatter.

impl Eq for LtoJobs

impl FromStr for LtoJobs

fn from_str(s: &str) -> Result<Self, ()>

Parses the part after -flto=. A number has to be positive, which is gcc’s rule: -flto=0 is refused rather than read as -fno-lto.

type Err = ()

The associated error which can be returned from parsing.

impl Hash for LtoJobs

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for LtoJobs

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

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

Restrict a value to a certain range.

impl PartialEq for LtoJobs

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for LtoJobs

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl StructuralPartialEq for LtoJobs