rewrite pgo-gen-no-imp-symbols to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -56,7 +56,6 @@ run-make/no-builtins-attribute/Makefile
 run-make/panic-abort-eh_frame/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-indirect-call-promotion/Makefile
 run-make/pointer-auth-link-with-c/Makefile
 run-make/print-calling-conventions/Makefile

tests/run-make/lto-linkage-used-attr/rmake.rs

@@ -4,7 +4,8 @@
 // This test checks that the impl_* symbols are preserved as they should.
 // See https://github.com/rust-lang/rust/issues/108030
 
-//FIXME(Oneirical): try it on more than only-x86_64-unknown-linux-gnu
+//@ only-x86_64-unknown-linux-gnu
+// Reason: some of the inline assembly directives are architecture-specific.
 
 use run_make_support::rustc;
 

tests/run-make/pgo-gen-no-imp-symbols/Makefile

@@ -0,0 +1,27 @@
+// LLVM's profiling instrumentation adds a few symbols that are used by the profiler runtime.
+// Since these show up as globals in the LLVM IR, the compiler generates dllimport-related
+// __imp_ stubs for them. This can lead to linker errors because the instrumentation
+// symbols have weak linkage or are in a comdat section, but the __imp_ stubs aren't.
+// Since profiler-related symbols were excluded from stub-generation in #59812, this has
+// been fixed, and this test checks that the llvm profile symbol appear, but without the
+// anomalous __imp_ stubs.
+// See https://github.com/rust-lang/rust/pull/59812
+
+use run_make_support::{cwd, rfs, rustc};
+
+fn main() {
+    rustc()
+        .input("test.rs")
+        .emit("llvm-ir")
+        .opt()
+        .codegen_units(1)
+        .profile_generate(cwd())
+        .arg("-Zno-profiler-runtime")
+        .run();
+    let out = rfs::read_to_string("test.ll");
+    // We expect symbols starting with "__llvm_profile_".
+    assert!(out.contains("__llvm_profile_"));
+    // We do NOT expect the "__imp_" version of these symbols.
+    assert!(!out.contains("__imp___llvm_profile_")); // 64 bit
+    assert!(!out.contains("__imp____llvm_profile_")); // 32 bit
+}