pub enum Lto {
    Run(Option<InternedString>),
    Off,
    OnlyBitcode,
    ObjectAndBitcode,
    OnlyObject,
}
Expand description

Possible ways to run rustc and request various parts of LTO.

VariantFlagObject CodeBitcode
Run-C lto=foon/an/a
Off-C lto=offn/an/a
OnlyBitcode-C linker-plugin-lto
ObjectAndBitcode
OnlyObject-C embed-bitcode=no

Variants

Run(Option<InternedString>)

LTO is run for this rustc, and it’s -Clto=foo. If the given value is None, that corresponds to -Clto with no argument, which means do “fat” LTO.

Off

LTO has been explicitly listed as “off”. This means no thin-local-LTO, no LTO anywhere, I really mean it!

OnlyBitcode

This rustc invocation only needs to produce bitcode (it is only used for LTO), there’s no need to produce object files, so we can pass -Clinker-plugin-lto

ObjectAndBitcode

This rustc invocation needs to embed bitcode in object files. This means that object files may be used for a normal link, and the crate may be loaded for LTO later, so both are required.

OnlyObject

This should not include bitcode. This is primarily to reduce disk space usage.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

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

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

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

Returns the argument unchanged.

Calls U::from(self).

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

Should always be Self

The resulting type after obtaining ownership.

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

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.