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// NOTE: this file is copy-pasted between several Embassy crates, because there is no
// straightforward way to share this code:
// - it cannot be placed into the root of the repo and linked from each build.rs using `#[path =
// "../build_common.rs"]`, because `cargo publish` requires that all files published with a crate
// reside in the crate's directory,
// - it cannot be symlinked from `embassy-xxx/build_common.rs` to `../build_common.rs`, because
// symlinks don't work on Windows.
use std::collections::HashSet;
use std::env;
/// Helper for emitting cargo instruction for enabling configs (`cargo:rustc-cfg=X`) and declaring
/// them (`cargo:rust-check-cfg=cfg(X)`).
#[derive(Debug)]
pub struct CfgSet {
enabled: HashSet<String>,
declared: HashSet<String>,
}
impl CfgSet {
pub fn new() -> Self {
Self {
enabled: HashSet::new(),
declared: HashSet::new(),
}
}
/// Enable a config, which can then be used in `#[cfg(...)]` for conditional compilation.
///
/// All configs that can potentially be enabled should be unconditionally declared using
/// [`Self::declare()`].
pub fn enable(&mut self, cfg: impl AsRef<str>) {
if self.enabled.insert(cfg.as_ref().to_owned()) {
println!("cargo:rustc-cfg={}", cfg.as_ref());
}
}
pub fn enable_all(&mut self, cfgs: &[impl AsRef<str>]) {
for cfg in cfgs.iter() {
self.enable(cfg.as_ref());
}
}
/// Declare a valid config for conditional compilation, without enabling it.
///
/// This enables rustc to check that the configs in `#[cfg(...)]` attributes are valid.
pub fn declare(&mut self, cfg: impl AsRef<str>) {
if self.declared.insert(cfg.as_ref().to_owned()) {
println!("cargo:rustc-check-cfg=cfg({})", cfg.as_ref());
}
}
pub fn declare_all(&mut self, cfgs: &[impl AsRef<str>]) {
for cfg in cfgs.iter() {
self.declare(cfg.as_ref());
}
}
pub fn set(&mut self, cfg: impl Into<String>, enable: bool) {
let cfg = cfg.into();
if enable {
self.enable(cfg.clone());
}
self.declare(cfg);
}
}
/// Sets configs that describe the target platform.
pub fn set_target_cfgs(cfgs: &mut CfgSet) {
let target = env::var("TARGET").unwrap();
if target.starts_with("thumbv6m-") {
cfgs.enable_all(&["cortex_m", "armv6m"]);
} else if target.starts_with("thumbv7m-") {
cfgs.enable_all(&["cortex_m", "armv7m"]);
} else if target.starts_with("thumbv7em-") {
cfgs.enable_all(&["cortex_m", "armv7m", "armv7em"]);
} else if target.starts_with("thumbv8m.base") {
cfgs.enable_all(&["cortex_m", "armv8m", "armv8m_base"]);
} else if target.starts_with("thumbv8m.main") {
cfgs.enable_all(&["cortex_m", "armv8m", "armv8m_main"]);
}
cfgs.declare_all(&[
"cortex_m",
"armv6m",
"armv7m",
"armv7em",
"armv8m",
"armv8m_base",
"armv8m_main",
]);
cfgs.set("has_fpu", target.ends_with("-eabihf"));
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct CompilerDate {
year: u16,
month: u8,
day: u8,
}
impl CompilerDate {
fn parse(date: &str) -> Option<Self> {
let mut parts = date.split('-');
let year = parts.next()?.parse().ok()?;
let month = parts.next()?.parse().ok()?;
let day = parts.next()?.parse().ok()?;
Some(Self { year, month, day })
}
}
impl PartialEq<&str> for CompilerDate {
fn eq(&self, other: &&str) -> bool {
let Some(other) = Self::parse(other) else {
return false;
};
self.eq(&other)
}
}
impl PartialOrd<&str> for CompilerDate {
fn partial_cmp(&self, other: &&str) -> Option<std::cmp::Ordering> {
Self::parse(other).map(|other| self.cmp(&other))
}
}
pub struct CompilerInfo {
#[allow(unused)]
pub version: rustc_version::Version,
pub channel: rustc_version::Channel,
pub commit_date: Option<CompilerDate>,
}
pub fn compiler_info() -> Option<CompilerInfo> {
let Ok(meta) = rustc_version::version_meta() else {
return None;
};
Some(CompilerInfo {
version: meta.semver,
channel: meta.channel,
commit_date: meta.commit_date.as_deref().and_then(CompilerDate::parse),
})
}
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