Add a std feature to vm

Author: coolreader18

vm/Cargo.toml

@@ -9,13 +9,14 @@ edition = "2018"
 include = ["src/**/*.rs", "Cargo.toml", "build.rs", "Lib/**/*.py"]
 
 [features]
-default = ["compile-parse", "threading"]
+default = ["compile-parse", "threading", "std"]
 vm-tracing-logging = []
 flame-it = ["flame", "flamer"]
 freeze-stdlib = ["rustpython-pylib"]
 jit = ["rustpython-jit"]
 threading = ["rustpython-common/threading"]
 compile-parse = ["rustpython-parser", "rustpython-compiler"]
+std = ["rustpython-compiler/std"] # enables compiler-core/std, parser/std, etc
 
 ssl = ["openssl", "openssl-sys", "openssl-probe"]
 

vm/src/lib.rs

@@ -12,6 +12,7 @@
 #![allow(clippy::module_inception)]
 #![doc(html_logo_url = "https://raw.githubusercontent.com/RustPython/RustPython/master/logo.png")]
 #![doc(html_root_url = "https://docs.rs/rustpython-vm/")]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 #[cfg(feature = "flame-it")]
 #[macro_use]