Set RUST_SAVE_ANALYSIS_CONFIG env variable for run-pass tests

This fixes rust-lang#96928 by setting the RUST_SAVE_ANALYSIS_CONFIG environment variable for run-pass tests in order to change the location where the result of the analysis is saved.

Author: AmSdGo

compiler/rustc_save_analysis/src/lib.rs

@@ -897,28 +897,25 @@ impl<'a> DumpHandler<'a> {
 
     fn output_file(&self, ctx: &SaveContext<'_>) -> (BufWriter<File>, PathBuf) {
         let sess = &ctx.tcx.sess;
-        let file_name = match ctx.config.output_file {
-            Some(ref s) => PathBuf::from(s),
+        let mut root_path = match self.odir {
+            Some(val) => val.join("save-analysis"),
             None => {
-                let mut root_path = match self.odir {
-                    Some(val) => val.join("save-analysis"),
-                    None => PathBuf::from("save-analysis-temp"),
-                };
-
-                if let Err(e) = std::fs::create_dir_all(&root_path) {
-                    error!("Could not create directory {}: {}", root_path.display(), e);
-                }
-
-                let executable = sess.crate_types().iter().any(|ct| *ct == CrateType::Executable);
-                let mut out_name = if executable { String::new() } else { "lib".to_owned() };
-                out_name.push_str(&self.cratename);
-                out_name.push_str(&sess.opts.cg.extra_filename);
-                out_name.push_str(".json");
-                root_path.push(&out_name);
-
-                root_path
+                PathBuf::from(ctx.config.output_file.as_ref().unwrap()).join("save-analysis-temp")
             }
         };
+        if let Err(e) = std::fs::create_dir_all(&root_path) {
+            error!("Could not create directory {}: {}", root_path.display(), e);
+        }
+        let file_name = {
+            let executable = sess.crate_types().iter().any(|ct| *ct == CrateType::Executable);
+            let mut out_name = if executable { String::new() } else { "lib".to_owned() };
+            out_name.push_str(&self.cratename);
+            out_name.push_str(&sess.opts.cg.extra_filename);
+            out_name.push_str(".json");
+            root_path.push(&out_name);
+
+            root_path
+        };
 
         info!("Writing output to {}", file_name.display());
 

src/tools/compiletest/src/runtest.rs

@@ -2011,6 +2011,17 @@ impl<'test> TestCx<'test> {
 
         match output_file {
             TargetLocation::ThisFile(path) => {
+                // The idea here is to use the env variable to pass the build_base directory to rustc_save_analysis to be used in cases where there is no output directory
+                // Use of double backslash in `base` below is to cater for paths in Windows OS
+                env::set_var(
+                    "RUST_SAVE_ANALYSIS_CONFIG",
+                    format!(
+                        "{{\"output_file\": \"{base}\",\"full_docs\": false,\
+                      \"pub_only\": true,\"reachable_only\": false,\
+                      \"distro_crate\": true,\"signatures\": false,\"borrow_data\": false}}",
+                        base = self.config.build_base.display().to_string().replace("\\", "\\\\"),
+                    ),
+                );
                 rustc.arg("-o").arg(path);
             }
             TargetLocation::ThisDirectory(path) => {