Is there a list of all cfg features?

问题

Rust has the ability to check configuration at build time with, e.g., #[cfg(target_os = "linux")] or if cfg!(target_os = "linux") {...}, where target_os is a feature.

Is there a list of all (or, at least, commonly used) features that can be checked in Rust?

See related question regarding attributes Is there an exhaustive list of standard attributes anywhere?.

回答1:

The "Conditional compilation" section of the Reference has a list of configurations that must be defined (as of Rust 1.14):

target_arch with values like:
- x86
- x86_64
- mips
- powerpc
- powerpc64
- arm
- aarch64
target_os with values like:
- windows
- macos
- ios
- linux
- android
- freebsd
- dragonfly
- bitrig
- openbsd
- netbsd
target_family with values like:
- unix
- windows
unix (shortcut for target_family)
windows (shortcut for target_family)
target_env with values like:
- gnu
- msvc
- musl
- "" (empty string)
target_endian with values:
- little
- big
target_pointer_width with values like:
- 32
- 64
target_has_atomic with values like:
- 8
- 16
- 32
- 64
- ptr
target_vendor with values like:
- apple
- pc
- unknown
test
debug_assertions

回答2:

You can also use this command: rustc --print target-list.

Each triple are formatted as follows: {arch}-{vendor}-{sys}-{abi}.

For example, the triple 'arm-unknown-linux-gnueabihf' refers to:

architecture: arm
vendor: unknown. In this case, no vendor was specified.
system: linux
ABI: gnueabihf

回答3:

See also https://internals.rust-lang.org/t/all-the-rust-features/4322 for a comprehensive list of features.

Bear in mind that some / most of the features won't be stabilized so will only be available in nightly for some time and are subject to breaking improvements / upgrades until they are either stabilized or discontinued.

Features in rust nightly is survival of the fittest.

来源：https://stackoverflow.com/questions/41742046/is-there-a-list-of-all-cfg-features

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rust

rust-cargo