Enum cargo::core::compiler::Lto

source ·
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§

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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.

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Off

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

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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

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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.

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

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.

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: 24 bytes

Size for each variant:

  • Run: 16 bytes
  • Off: 0 bytes
  • OnlyBitcode: 0 bytes
  • ObjectAndBitcode: 0 bytes
  • OnlyObject: 0 bytes