rewrite remap-path-prefix to rmake

Author: Oneirical

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

@@ -106,6 +106,17 @@ impl Rustc {
         self
     }
 
+    /// Remap source path prefixes in all output.
+    pub fn remap_path_prefix<P: AsRef<Path>>(&mut self, from: P, to: P) -> &mut Self {
+        let from = from.as_ref().to_string_lossy();
+        let to = to.as_ref().to_string_lossy();
+
+        self.cmd.arg("--remap-path-prefix");
+        self.cmd.arg(format!("{from}={to}"));
+
+        self
+    }
+
     /// Specify path to the input file.
     pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
         self.cmd.arg(path.as_ref());

tests/run-make/remap-path-prefix/Makefile

@@ -0,0 +1,58 @@
+// Generating metadata alongside remap-path-prefix would fail to actually remap the path
+// in the metadata. After this was fixed in #85344, this test checks that "auxiliary" is being
+// successfully remapped to "/the/aux" in the rmeta files.
+// See https://github.com/rust-lang/rust/pull/85344
+
+// FIXME(Oneirical): check if works without ignore-windows
+
+use run_make_support::{invalid_utf8_contains, invalid_utf8_not_contains, is_darwin, rustc};
+
+fn main() {
+    let mut out_simple = rustc();
+    let mut out_object = rustc();
+    let mut out_macro = rustc();
+    let mut out_diagobj = rustc();
+    out_simple
+        .remap_path_prefix("auxiliary", "/the/aux")
+        .crate_type("lib")
+        .emit("metadata")
+        .input("auxiliary/lib.rs");
+    out_object
+        .remap_path_prefix("auxiliary", "/the/aux")
+        .crate_type("lib")
+        .emit("metadata")
+        .input("auxiliary/lib.rs");
+    out_macro
+        .remap_path_prefix("auxiliary", "/the/aux")
+        .crate_type("lib")
+        .emit("metadata")
+        .input("auxiliary/lib.rs");
+    out_diagobj
+        .remap_path_prefix("auxiliary", "/the/aux")
+        .crate_type("lib")
+        .emit("metadata")
+        .input("auxiliary/lib.rs");
+
+    out_simple.run();
+    invalid_utf8_contains("liblib.rmeta", "/the/aux/lib.rs");
+    invalid_utf8_not_contains("liblib.rmeta", "auxiliary");
+
+    out_object.arg("-Zremap-path-scope=object");
+    out_macro.arg("-Zremap-path-scope=macro");
+    out_diagobj.arg("-Zremap-path-scope=diagnostics,object");
+    if is_darwin() {
+        out_object.arg("-Csplit-debuginfo=off");
+        out_macro.arg("-Csplit-debuginfo=off");
+        out_diagobj.arg("-Csplit-debuginfo=off");
+    }
+
+    out_object.run();
+    invalid_utf8_contains("liblib.rmeta", "/the/aux/lib.rs");
+    invalid_utf8_not_contains("liblib.rmeta", "auxiliary");
+    out_macro.run();
+    invalid_utf8_contains("liblib.rmeta", "/the/aux/lib.rs");
+    invalid_utf8_not_contains("liblib.rmeta", "auxiliary");
+    out_diagobj.run();
+    invalid_utf8_contains("liblib.rmeta", "/the/aux/lib.rs");
+    invalid_utf8_not_contains("liblib.rmeta", "auxiliary");
+}