Move proc-macro-test test path fetching from include to env var

Author: Veykril

src/tools/rust-analyzer/crates/proc-macro-srv/build.rs

@@ -1,7 +1,7 @@
 //! Determine rustc version `proc-macro-srv` (and thus the sysroot ABI) is
 //! build with and make it accessible at runtime for ABI selection.
 
-use std::{env, fs::File, io::Write, path::PathBuf, process::Command};
+use std::{env, process::Command};
 
 fn main() {
     println!("cargo::rustc-check-cfg=cfg(rust_analyzer)");

src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/build.rs

@@ -121,6 +121,5 @@ fn main() {
     // This file is under `target_dir` and is already under `OUT_DIR`.
     let artifact_path = artifact_path.expect("no dylib for proc-macro-test-impl found");
 
-    let info_path = out_dir.join("proc_macro_test_location.txt");
-    fs::write(info_path, artifact_path.to_str().unwrap()).unwrap();
+    println!("cargo::rustc-env=PROC_MACRO_TEST_LOCATION={}", artifact_path.display());
 }

src/tools/rust-analyzer/crates/proc-macro-srv/proc-macro-test/src/lib.rs

@@ -1,4 +1,3 @@
 //! Exports a few trivial procedural macros for testing.
 
-pub static PROC_MACRO_TEST_LOCATION: &str =
-    include_str!(concat!(env!("OUT_DIR"), "/proc_macro_test_location.txt"));
+pub static PROC_MACRO_TEST_LOCATION: &str = env!("PROC_MACRO_TEST_LOCATION");