diff options
| -rw-r--r-- | library/std/src/sys/env_consts.rs | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/library/std/src/sys/env_consts.rs b/library/std/src/sys/env_consts.rs index f439aa5a905..018d7954db2 100644 --- a/library/std/src/sys/env_consts.rs +++ b/library/std/src/sys/env_consts.rs @@ -1,6 +1,19 @@ //! Constants associated with each target. -// Keep entries sorted alphabetically. +// Replaces the #[else] gate with #[cfg(not(any(…)))] of all the other gates. +// This ensures that they must be mutually exclusive and do not have precedence +// like cfg_if!. +macro cfg_unordered( + $(#[cfg($cfg:meta)] $os:item)* + #[else] $fallback:item +) { + $(#[cfg($cfg)] $os)* + #[cfg(not(any($($cfg),*)))] $fallback +} + +// Keep entries sorted alphabetically and mutually exclusive. + +cfg_unordered! { #[cfg(target_os = "aix")] pub mod os { @@ -375,3 +388,17 @@ pub mod os { pub const EXE_SUFFIX: &str = ".exe"; pub const EXE_EXTENSION: &str = "exe"; } + +// The fallback when none of the other gates match. +#[else] +pub mod os { + pub const FAMILY: &str = ""; + pub const OS: &str = ""; + pub const DLL_PREFIX: &str = ""; + pub const DLL_SUFFIX: &str = ""; + pub const DLL_EXTENSION: &str = ""; + pub const EXE_SUFFIX: &str = ""; + pub const EXE_EXTENSION: &str = ""; +} + +} |