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env.rs
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env.rs
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//! Rust target environments
use crate::error::Error;
use core::{fmt, str::FromStr};
#[cfg(feature = "serde")]
use serde::{de, de::Error as DeError, ser, Deserialize, Serialize};
/// `target_env`: target environment that disambiguates the target platform by ABI / libc.
///
/// This value is closely related to the fourth element of the platform target triple,
/// though it is not identical. For example, embedded ABIs such as `gnueabihf` will simply
/// define `target_env` as `"gnu"` (i.e. `target::Env::GNU`)
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
#[non_exhaustive]
pub enum Env {
/// ``: None
None,
/// `eabihf`
Eabihf,
/// `gnu`: The GNU C Library (glibc)
Gnu,
/// `gnueabihf`
Gnueabihf,
/// `msvc`: Microsoft Visual C(++)
Msvc,
/// `musl`: Clean, efficient, standards-conformant libc implementation.
Musl,
/// `newlib`
Newlib,
/// `psx`
Psx,
/// `relibc`
Relibc,
/// `sgx`: Intel Software Guard Extensions (SGX) Enclave
Sgx,
/// `uclibc`: C library for developing embedded Linux systems
UClibc,
}
impl Env {
/// String representing this `Env` which matches `#[cfg(target_env)]`
pub fn as_str(self) -> &'static str {
match self {
Env::None => "",
Env::Eabihf => "eabihf",
Env::Gnu => "gnu",
Env::Gnueabihf => "gnueabihf",
Env::Msvc => "msvc",
Env::Musl => "musl",
Env::Newlib => "newlib",
Env::Psx => "psx",
Env::Relibc => "relibc",
Env::Sgx => "sgx",
Env::UClibc => "uclibc",
}
}
}
impl FromStr for Env {
type Err = Error;
/// Create a new `Env` from the given string
fn from_str(name: &str) -> Result<Self, Self::Err> {
let result = match name {
"" => Env::None,
"eabihf" => Env::Eabihf,
"gnu" => Env::Gnu,
"gnueabihf" => Env::Gnueabihf,
"msvc" => Env::Msvc,
"musl" => Env::Musl,
"newlib" => Env::Newlib,
"psx" => Env::Psx,
"relibc" => Env::Relibc,
"sgx" => Env::Sgx,
"uclibc" => Env::UClibc,
_ => return Err(Error),
};
Ok(result)
}
}
impl fmt::Display for Env {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_str())
}
}
#[cfg(feature = "serde")]
impl Serialize for Env {
fn serialize<S: ser::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_str(self.as_str())
}
}
#[cfg(all(feature = "serde", feature = "std"))]
impl<'de> Deserialize<'de> for Env {
fn deserialize<D: de::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
let string = std::string::String::deserialize(deserializer)?;
string.parse().map_err(|_| {
D::Error::custom(std::format!(
"Unrecognized value '{}' for target_env",
string
))
})
}
}