fix: trace env vars from [env] table

src/cargo/core/compiler/fingerprint/mod.rs

@@ -362,7 +362,6 @@
 mod dirty_reason;
 
 use std::collections::hash_map::{Entry, HashMap};
-
 use std::env;
 use std::fmt::{self, Display};
 use std::fs::{self, File};
@@ -383,6 +382,7 @@ use tracing::{debug, info};
 
 use crate::core::compiler::unit_graph::UnitDep;
 use crate::core::Package;
+use crate::util::context::EnvConfigValue;
 use crate::util::errors::CargoResult;
 use crate::util::interning::InternedString;
 use crate::util::{self, try_canonicalize};
@@ -2124,6 +2124,9 @@ enum DepInfoPathType {
 ///
 /// The serialized Cargo format will contain a list of files, all of which are
 /// relative if they're under `root`. or absolute if they're elsewhere.
+///
+/// The `config_envs` argument is a set of environment variables that are
+/// defined in `[env]` table of the `config.toml`.
 pub fn translate_dep_info(
     rustc_dep_info: &Path,
     cargo_dep_info: &Path,
@@ -2132,6 +2135,7 @@ pub fn translate_dep_info(
     target_root: &Path,
     rustc_cmd: &ProcessBuilder,
     allow_package: bool,
+    config_envs: &Arc<HashMap<String, EnvConfigValue>>,
 ) -> CargoResult<()> {
     let depinfo = parse_rustc_dep_info(rustc_dep_info)?;
 
@@ -2168,9 +2172,11 @@ pub fn translate_dep_info(
     // This also includes `CARGO` since if the code is explicitly wanting to
     // know that path, it should be rebuilt if it changes. The CARGO path is
     // not tracked elsewhere in the fingerprint.
-    on_disk_info
-        .env
-        .retain(|(key, _)| !rustc_cmd.get_envs().contains_key(key) || key == CARGO_ENV);
+    //
+    // For issue#13280, We trace env vars that are defined in the `config.toml`.
+    on_disk_info.env.retain(|(key, _)| {
+        config_envs.contains_key(key) || !rustc_cmd.get_envs().contains_key(key) || key == CARGO_ENV
+    });
 
     let serialize_path = |file| {
         // The path may be absolute or relative, canonical or not. Make sure

src/cargo/core/compiler/mod.rs

@@ -330,7 +330,7 @@ fn rustc(
     if hide_diagnostics_for_scrape_unit {
         output_options.show_diagnostics = false;
     }
-
+    let config_envs = build_runner.bcx.gctx.env_config()?.clone();
     return Ok(Work::new(move |state| {
         // Artifacts are in a different location than typical units,
         // hence we must assure the crate- and target-dependent
@@ -459,6 +459,7 @@ fn rustc(
                 &rustc,
                 // Do not track source files in the fingerprint for registry dependencies.
                 is_local,
+                &config_envs,
             )
             .with_context(|| {
                 internal(format!(

src/cargo/util/context/mod.rs

@@ -63,7 +63,7 @@ use std::io::SeekFrom;
 use std::mem;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
-use std::sync::Once;
+use std::sync::{Arc, Once};
 use std::time::Instant;
 
 use self::ConfigValue as CV;
@@ -227,7 +227,7 @@ pub struct GlobalContext {
     target_cfgs: LazyCell<Vec<(String, TargetCfgConfig)>>,
     doc_extern_map: LazyCell<RustdocExternMap>,
     progress_config: ProgressConfig,
-    env_config: LazyCell<EnvConfig>,
+    env_config: LazyCell<Arc<EnvConfig>>,
     /// This should be false if:
     /// - this is an artifact of the rustc distribution process for "stable" or for "beta"
     /// - this is an `#[test]` that does not opt in with `enable_nightly_features`
@@ -1833,10 +1833,10 @@ impl GlobalContext {
         &self.progress_config
     }
 
-    pub fn env_config(&self) -> CargoResult<&EnvConfig> {
+    pub fn env_config(&self) -> CargoResult<&Arc<EnvConfig>> {
         let env_config = self
             .env_config
-            .try_borrow_with(|| self.get::<EnvConfig>("env"))?;
+            .try_borrow_with(|| CargoResult::Ok(Arc::new(self.get::<EnvConfig>("env")?)))?;
 
         // Reasons for disallowing these values:
         //

tests/testsuite/cargo_env_config.rs

@@ -315,10 +315,11 @@ from-config
     p.cargo("run")
         .env("ENV_TEST", "from-env")
         .with_stdout_data(str![[r#"
-from-config
+from-env
 
 "#]])
         .with_stderr_data(str![[r#"
+[COMPILING] foo v0.5.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [RUNNING] `target/debug/foo[EXE]`
 
@@ -355,10 +356,11 @@ one
 
     p.cargo(r#"run --config 'env.ENV_TEST="two"'"#)
         .with_stdout_data(str![[r#"
-one
+two
 
 "#]])
         .with_stderr_data(str![[r#"
+[COMPILING] foo v0.5.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 [RUNNING] `target/debug/foo[EXE]`