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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
use std::env;
use std::process::Command;
use std::str::{self, FromStr};
// 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");
let minor = match rustc_minor_version() {
Some(minor) => minor,
None => return,
};
if minor >= 77 {
println!("cargo:rustc-check-cfg=cfg(no_core_cstr)");
println!("cargo:rustc-check-cfg=cfg(no_core_error)");
println!("cargo:rustc-check-cfg=cfg(no_core_net)");
println!("cargo:rustc-check-cfg=cfg(no_core_num_saturating)");
println!("cargo:rustc-check-cfg=cfg(no_core_try_from)");
println!("cargo:rustc-check-cfg=cfg(no_diagnostic_namespace)");
println!("cargo:rustc-check-cfg=cfg(no_float_copysign)");
println!("cargo:rustc-check-cfg=cfg(no_num_nonzero_signed)");
println!("cargo:rustc-check-cfg=cfg(no_relaxed_trait_bounds)");
println!("cargo:rustc-check-cfg=cfg(no_serde_derive)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic)");
println!("cargo:rustc-check-cfg=cfg(no_std_atomic64)");
println!("cargo:rustc-check-cfg=cfg(no_systemtime_checked_add)");
println!("cargo:rustc-check-cfg=cfg(no_target_has_atomic)");
}
let target = env::var("TARGET").unwrap();
let emscripten = target == "asmjs-unknown-emscripten" || target == "wasm32-unknown-emscripten";
// TryFrom, Atomic types, non-zero signed integers, and SystemTime::checked_add
// stabilized in Rust 1.34:
// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#tryfrom-and-tryinto
// https://blog.rust-lang.org/2019/04/11/Rust-1.34.0.html#library-stabilizations
if minor < 34 {
println!("cargo:rustc-cfg=no_core_try_from");
println!("cargo:rustc-cfg=no_num_nonzero_signed");
println!("cargo:rustc-cfg=no_systemtime_checked_add");
println!("cargo:rustc-cfg=no_relaxed_trait_bounds");
}
// f32::copysign and f64::copysign stabilized in Rust 1.35.
// https://blog.rust-lang.org/2019/05/23/Rust-1.35.0.html#copy-the-sign-of-a-floating-point-number-onto-another
if minor < 35 {
println!("cargo:rustc-cfg=no_float_copysign");
}
// Support for #[cfg(target_has_atomic = "...")] stabilized in Rust 1.60.
if minor < 60 {
println!("cargo:rustc-cfg=no_target_has_atomic");
// Allowlist of archs that support std::sync::atomic module. This is
// based on rustc's compiler/rustc_target/src/spec/*.rs.
let has_atomic64 = target.starts_with("x86_64")
|| target.starts_with("i686")
|| target.starts_with("aarch64")
|| target.starts_with("powerpc64")
|| target.starts_with("sparc64")
|| target.starts_with("mips64el")
|| target.starts_with("riscv64");
let has_atomic32 = has_atomic64 || emscripten;
if minor < 34 || !has_atomic64 {
println!("cargo:rustc-cfg=no_std_atomic64");
}
if minor < 34 || !has_atomic32 {
println!("cargo:rustc-cfg=no_std_atomic");
}
}
// Current minimum supported version of serde_derive crate is Rust 1.61.
if minor < 61 {
println!("cargo:rustc-cfg=no_serde_derive");
}
// Support for core::ffi::CStr and alloc::ffi::CString stabilized in Rust 1.64.
// https://blog.rust-lang.org/2022/09/22/Rust-1.64.0.html#c-compatible-ffi-types-in-core-and-alloc
if minor < 64 {
println!("cargo:rustc-cfg=no_core_cstr");
}
// Support for core::num::Saturating and std::num::Saturating stabilized in Rust 1.74
// https://blog.rust-lang.org/2023/11/16/Rust-1.74.0.html#stabilized-apis
if minor < 74 {
println!("cargo:rustc-cfg=no_core_num_saturating");
}
// Support for core::net stabilized in Rust 1.77.
// https://blog.rust-lang.org/2024/03/21/Rust-1.77.0.html
if minor < 77 {
println!("cargo:rustc-cfg=no_core_net");
}
// Support for the `#[diagnostic]` tool attribute namespace
// https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#diagnostic-attributes
if minor < 78 {
println!("cargo:rustc-cfg=no_diagnostic_namespace");
}
// The Error trait became available in core in 1.81.
// https://blog.rust-lang.org/2024/09/05/Rust-1.81.0.html#coreerrorerror
if minor < 81 {
println!("cargo:rustc-cfg=no_core_error");
}
}
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()
}
|
