Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
175: Const fn r=KodrAus a=arturoc This adds const functions for every non mutable function in the crate. Co-authored-by: Arturo Castro <arturo@rin.rs>
- Loading branch information
Showing
3 changed files
with
218 additions
and
49 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,44 @@ | ||
use std::env; | ||
use std::process::Command; | ||
use std::str::{self, FromStr}; | ||
|
||
fn main(){ | ||
let minor = match rustc_minor_version() { | ||
Some(minor) => minor, | ||
None => return, | ||
}; | ||
|
||
// const fn stabilized in Rust 1.31: | ||
if minor >= 31 { | ||
println!("cargo:rustc-cfg=bitflags_const_fn"); | ||
} | ||
} | ||
|
||
fn rustc_minor_version() -> Option<u32> { | ||
let rustc = match env::var_os("RUSTC") { | ||
Some(rustc) => rustc, | ||
None => return None, | ||
}; | ||
|
||
let output = match Command::new(rustc).arg("--version").output() { | ||
Ok(output) => output, | ||
Err(_) => return None, | ||
}; | ||
|
||
let version = match str::from_utf8(&output.stdout) { | ||
Ok(version) => version, | ||
Err(_) => return None, | ||
}; | ||
|
||
let mut pieces = version.split('.'); | ||
if pieces.next() != Some("rustc 1") { | ||
return None; | ||
} | ||
|
||
let next = match pieces.next() { | ||
Some(next) => next, | ||
None => return None, | ||
}; | ||
|
||
u32::from_str(next).ok() | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters