tests: Test no profiler-runtime injected for rlib

This test fails in this commit, but passes with the fix in the next
commit.

Author: Enselic

tests/run-make/no-profiler-runtime-for-rlib/rmake.rs

@@ -0,0 +1,62 @@
+//! Tests that for `--crate-type rlib`` there is no profiler runtime injected. This
+//! is needed for
+//! ```sh
+//! RUSTFLAGS="-Cinstrument-coverage" cargo build -Zbuild-std=std,profiler_builtins
+//! ```
+//! to work. See <https://github.com/rust-lang/rust/pull/133300>.
+
+use run_make_support::rustc;
+
+fn main() {
+    let stderr = rustc()
+        .env("RUSTC_LOG", "rustc_metadata::creader=info")
+        .input("test.rs")
+        .opt()
+        .arg("-Cinstrument-coverage")
+        .arg("--crate-type=rlib")
+        .run()
+        .stderr_utf8();
+
+    let mut names: Vec<&str> = vec![];
+    let mut in_resolved_crates = false;
+    for line in stderr.lines() {
+        if !in_resolved_crates {
+            in_resolved_crates = line.starts_with(" INFO rustc_metadata::creader resolved crates:");
+        } else {
+            if line.starts_with("   name: ") {
+                names.push(line.strip_prefix("   name: ").unwrap());
+            } else if !line.starts_with("   ") {
+                break;
+            }
+        }
+    }
+
+    // Make sure we see "core" and "std" so we know parsing works at all.
+    assert!(names.contains(&"core"));
+    assert!(names.contains(&"std"));
+
+    // Now make sure "profiler_builtins" has not been injected since we built an rlib.
+    assert!(!names.contains(&"profiler_builtins"));
+}
+
+/* Example stderr that we parse follows. Generated by
+https://github.com/rust-lang/rust/blob/b4cfcd9a8f82c689/compiler/rustc_metadata/src/creader.rs#L133
+
+ INFO rustc_metadata::creader resolved crates:
+   name: std
+   cnum: 1
+   hash: df6056d905861dad8c1fb84eaadfee3d
+   reqd: Explicit
+    rlib: .../stable-x86_64-unknown-linux-gnu/lib/libstd-22be60875a4ac8d7.rlib
+   name: core
+   cnum: 2
+   hash: d2a9b639158d9bf64905c675d97640f2
+   reqd: Explicit
+    rlib: .../stable-x86_64-unknown-linux-gnu/lib/libcore-46b25da62cc69443.rlib
+   name: compiler_builtins
+   cnum: 3
+   hash: 7130505301859f8a39afc97a37b8d758
+   reqd: Explicit
+    rlib: .../stable-x86_64-unknown-linux-gnu/lib/libcompiler_builtins-c71612932829263c.rlib
+
+*/

tests/run-make/no-profiler-runtime-for-rlib/test.rs

@@ -0,0 +1 @@
+pub fn test() {}