rewrite pgo-gen to rmake

Author: Oneirical

src/tools/run-make-support/src/lib.rs

@@ -272,7 +272,6 @@ pub fn shallow_find_files<P: AsRef<Path>, F: Fn(&PathBuf) -> bool>(
     for entry in fs_wrapper::read_dir(path) {
         let entry = entry.expect("failed to read directory entry.");
         let path = entry.path();
-
         if path.is_file() && closure(&path) {
             matching_files.push(path);
         }

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -109,7 +109,6 @@ run-make/pass-non-c-like-enum-to-c/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile
 run-make/pgo-gen-no-imp-symbols/Makefile
-run-make/pgo-gen/Makefile
 run-make/pgo-indirect-call-promotion/Makefile
 run-make/pgo-use/Makefile
 run-make/pointer-auth-link-with-c/Makefile

tests/run-make/pgo-gen/Makefile

@@ -0,0 +1,18 @@
+// -C profile-generate, when used with rustc, is supposed to output
+// profile files (.profraw) after running a binary to analyze how the compiler
+// optimizes code. This test checks that these files are generated.
+// See https://github.com/rust-lang/rust/pull/48346
+
+//@ needs-profiler-support
+//@ ignore-cross-compile
+
+use run_make_support::{cwd, find_files_by_prefix_and_extension, run, rustc};
+
+fn main() {
+    rustc().arg("-g").profile_generate(cwd()).run();
+    run("test");
+    assert!(
+        find_files_by_prefix_and_extension(cwd(), "default", "profraw").len() > 0,
+        "no .profraw file generated"
+    );
+}