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Used in 99 crates (38 directly)

MIT/Apache

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Cargo Emit

Talk to Cargo easily at build time, brought to you by Nikolai Vazquez.

This library provides:

Convenience macros for communicating with Cargo during the build.rs phrase. Cargo listens to certain build script outputs that dictate how it should behave.
An accessible location for seeing what script build outputs are available to emit.
Protection against typos that can be made when printing these formatted outputs directly yourself. Mistyping macro names will result in a compile failure.

Usage

This crate exposes the following macros:

Macro	Output
`pair!($key, $value)`	`cargo:$key=$value`
`rerun_if_changed!($path)`	`cargo:rerun-if-changed=$path`
`rerun_if_env_changed!($key)`	`cargo:rerun-if-env-changed=$key`
`rustc_cdylib_link_arg!($flag)`	`cargo:rustc-cdylib-link-arg=$flag`
`rustc_cfg!($feature)`	`cargo:rustc-cfg=$feature`
`rustc_env!($key, $value)`	`cargo:rustc-env=$key=$value`
`rustc_flags!($flags)`	`cargo:rustc-flags=$flags`
`rustc_link_arg!($arg)`	`cargo:rustc-link-arg=$arg`
`rustc_link_arg_bin!($bin => $arg)`	`cargo:rustc-link-arg-bin=$bin=$arg`
`rustc_link_arg_bins!($arg)`	`cargo:rustc-link-arg-bins=$arg`
`rustc_link_lib!($name => $kind)`	`cargo:rustc-link-lib=$kind=$name`
`rustc_link_search!($path => $kind)`	`cargo:rustc-link-search=$kind=$path`
`warning!($message)`	`cargo:warning=$message`

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