1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// Copyright (c) The camino Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Adapted from
//! https://github.com/dtolnay/syn/blob/a54fb0098c6679f1312113ae2eec0305c51c7390/build.rs.
use std::{env, process::Command, str};
// The rustc-cfg strings below are *not* public API. Please let us know by
// opening a GitHub issue if your build environment requires some way to enable
// these cfgs other than by executing our build script.
fn main() {
println!("cargo:rerun-if-changed=build.rs");
// Required by Rust 1.79+.
println!("cargo:rustc-check-cfg=cfg(doc_cfg)");
println!("cargo:rustc-check-cfg=cfg(path_buf_deref_mut)");
println!("cargo:rustc-check-cfg=cfg(try_reserve_2)");
println!("cargo:rustc-check-cfg=cfg(os_str_bytes)");
println!("cargo:rustc-check-cfg=cfg(os_string_pathbuf_leak)");
println!("cargo:rustc-check-cfg=cfg(absolute_path)");
println!("cargo:rustc-check-cfg=cfg(path_add_extension)");
println!("cargo:rustc-check-cfg=cfg(pathbuf_const_new)");
let compiler = match rustc_version() {
Some(compiler) => compiler,
None => return,
};
// NOTE:
// Adding a new cfg gated by Rust version MUST be accompanied by an addition to the matrix in
// .github/workflows/ci.yml.
//
// try_reserve_2 was added in a 1.63 nightly.
if (compiler.minor >= 63
&& (compiler.channel == ReleaseChannel::Stable || compiler.channel == ReleaseChannel::Beta))
|| compiler.minor >= 64
{
println!("cargo:rustc-cfg=try_reserve_2");
}
// path_buf_deref_mut was added in a 1.68 nightly.
if (compiler.minor >= 68
&& (compiler.channel == ReleaseChannel::Stable || compiler.channel == ReleaseChannel::Beta))
|| compiler.minor >= 69
{
println!("cargo:rustc-cfg=path_buf_deref_mut");
}
// os_str_bytes was added in 1.74.
if (compiler.minor >= 74 && compiler.channel == ReleaseChannel::Stable) || compiler.minor >= 75
{
println!("cargo:rustc-cfg=os_str_bytes");
}
// absolute_path was added in 1.79.
if (compiler.minor >= 79 && compiler.channel == ReleaseChannel::Stable) || compiler.minor >= 80
{
println!("cargo:rustc-cfg=absolute_path");
}
// os_string_pathbuf_leak was added in 1.89.
if (compiler.minor >= 89 && compiler.channel == ReleaseChannel::Stable) || compiler.minor >= 90
{
println!("cargo:rustc-cfg=os_string_pathbuf_leak");
}
// path_add_extension was added in 1.91.
if (compiler.minor >= 91 && compiler.channel == ReleaseChannel::Stable) || compiler.minor >= 92
{
println!("cargo:rustc-cfg=path_add_extension");
}
// pathbuf_const_new was added in 1.91.
if (compiler.minor >= 91 && compiler.channel == ReleaseChannel::Stable) || compiler.minor >= 92
{
println!("cargo:rustc-cfg=pathbuf_const_new");
}
}
struct Compiler {
minor: u32,
channel: ReleaseChannel,
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum ReleaseChannel {
Stable,
Beta,
Nightly,
}
fn rustc_version() -> Option<Compiler> {
let rustc = env::var_os("RUSTC")?;
let output = Command::new(rustc).arg("--version").output().ok()?;
let version = str::from_utf8(&output.stdout).ok()?;
let mut pieces = version.split('.');
if pieces.next() != Some("rustc 1") {
return None;
}
let minor = pieces.next()?.parse().ok()?;
let channel = if version.contains("nightly") {
ReleaseChannel::Nightly
} else if version.contains("beta") {
ReleaseChannel::Beta
} else {
ReleaseChannel::Stable
};
Some(Compiler { minor, channel })
}
|
