rewrite incr-foreign-head-span to rmake

Author: Oneirical

src/tools/compiletest/src/command-list.rs

@@ -201,6 +201,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "only-wasm32-wasip1",
     "only-watchos",
     "only-windows",
+    "only-windows-gnu",
     "only-x86",
     "only-x86_64",
     "only-x86_64-fortanix-unknown-sgx",

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -31,7 +31,6 @@ run-make/foreign-double-unwind/Makefile
 run-make/foreign-exceptions/Makefile
 run-make/foreign-rust-exceptions/Makefile
 run-make/incr-add-rust-src-component/Makefile
-run-make/incr-foreign-head-span/Makefile
 run-make/issue-107094/Makefile
 run-make/issue-14698/Makefile
 run-make/issue-15460/Makefile

tests/run-make/incr-foreign-head-span/Makefile

@@ -0,0 +1,25 @@
+// Ensure that modifying a crate on disk (without recompiling it)
+// does not cause ICEs (internal compiler errors) in downstream crates.
+// Previously, we would call `SourceMap.guess_head_span` on a span
+// from an external crate, which would cause us to read an upstream
+// source file from disk during compilation of a downstream crate.
+// See https://github.com/rust-lang/rust/issues/86480
+
+//@ ignore-none
+// Reason: no-std is not supported
+//@ ignore-nvptx64-nvidia-cuda
+// Reason: can't find crate for 'std'
+
+use run_make_support::{rfs, rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("first_crate.rs").incremental("incr").crate_type("lib").run();
+    rustc()
+        .input("second_crate.rs")
+        .incremental("incr")
+        .extern_("first_crate", rust_lib_name("first_crate"))
+        .crate_type("lib")
+        .run();
+    rfs::remove_file("first_crate.rs");
+    rustc().input("second_crate.rs").incremental("incr").cfg("second_run").crate_type("lib").run();
+}