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
|
use rustc_abi::Endian;
use crate::spec::base::xtensa;
use crate::spec::{Target, TargetMetadata, TargetOptions, cvs};
pub(crate) fn target() -> Target {
Target {
llvm_target: "xtensa-none-elf".into(),
pointer_width: 32,
data_layout: "e-m:e-p:32:32-v1:8:8-i64:64-i128:128-n32".into(),
arch: "xtensa".into(),
metadata: TargetMetadata { description: None, tier: None, host_tools: None, std: None },
options: TargetOptions {
endian: Endian::Little,
c_int_width: 32,
families: cvs!["unix"],
os: "espidf".into(),
env: "newlib".into(),
vendor: "espressif".into(),
executables: true,
cpu: "esp32s2".into(),
linker: Some("xtensa-esp32s2-elf-gcc".into()),
// See https://github.com/espressif/rust-esp32-example/issues/3#issuecomment-861054477
//
// While the ESP32-S2 chip does not natively support atomics, ESP-IDF does support
// the __atomic* and __sync* compiler builtins. Setting `max_atomic_width` and `atomic_cas`
// and `atomic_cas: true` will cause the compiler to emit libcalls to these builtins. On the
// ESP32-S2, these are guaranteed to be lock-free.
//
// Support for atomics is necessary for the Rust STD library, which is supported by ESP-IDF.
max_atomic_width: Some(32),
atomic_cas: true,
..xtensa::opts()
},
}
}
|
