Migrate emit-to-stdout to new run-make

Co-authored-by: Oneirical <[email protected]>
Co-authored-by: Chris Denton <[email protected]>

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

@@ -73,23 +73,23 @@ macro_rules! impl_common_helpers {
             /// Configuration for the child process’s standard input (stdin) handle.
             ///
             /// See [`std::process::Command::stdin`].
-            pub fn stdin<T: Into<Stdio>>(&mut self, cfg: T) -> &mut Self {
+            pub fn stdin<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
                 self.cmd.stdin(cfg);
                 self
             }
 
             /// Configuration for the child process’s standard output (stdout) handle.
             ///
             /// See [`std::process::Command::stdout`].
-            pub fn stdout<T: Into<Stdio>>(&mut self, cfg: T) -> &mut Self {
+            pub fn stdout<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
                 self.cmd.stdout(cfg);
                 self
             }
 
             /// Configuration for the child process’s standard error (stderr) handle.
             ///
             /// See [`std::process::Command::stderr`].
-            pub fn stderr<T: Into<Stdio>>(&mut self, cfg: T) -> &mut Self {
+            pub fn stderr<T: Into<::std::process::Stdio>>(&mut self, cfg: T) -> &mut Self {
                 self.cmd.stderr(cfg);
                 self
             }

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -1,6 +1,5 @@
 run-make/branch-protection-check-IBT/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
-run-make/emit-to-stdout/Makefile
 run-make/extern-fn-reachable/Makefile
 run-make/incr-add-rust-src-component/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile

tests/run-make/emit-to-stdout/rmake.rs

@@ -0,0 +1,73 @@
+//! If `-o -` or `--emit KIND=-` is provided, output should be written to stdout
+//! instead. Binary output (`obj`, `llvm-bc`, `link` and `metadata`)
+//! being written this way will result in an error if stdout is a tty.
+//! Multiple output types going to stdout will trigger an error too,
+//! as they would all be mixed together.
+//!
+//! See <https://github.com/rust-lang/rust/pull/111626>.
+
+use std::fs::File;
+
+use run_make_support::{diff, run_in_tmpdir, rustc};
+
+// Test emitting text outputs to stdout works correctly
+fn run_diff(name: &str, file_args: &[&str]) {
+    rustc().emit(format!("{name}={name}")).input("test.rs").args(file_args).run();
+    let out = rustc().emit(format!("{name}=-")).input("test.rs").run().stdout_utf8();
+    diff().expected_file(name).actual_text("stdout", &out).run();
+}
+
+// Test that emitting binary formats to a terminal gives the correct error
+fn run_terminal_err_diff(name: &str) {
+    #[cfg(not(windows))]
+    let terminal = File::create("/dev/ptmx").unwrap();
+    // FIXME: If this test fails and the compiler does print to the console,
+    // then this will produce a lot of output.
+    // We should spawn a new console instead to print stdout.
+    #[cfg(windows)]
+    let terminal = File::options().read(true).write(true).open(r"\\.\CONOUT$").unwrap();
+
+    let err = File::create(name).unwrap();
+    rustc().emit(format!("{name}=-")).input("test.rs").stdout(terminal).stderr(err).run_fail();
+    diff().expected_file(format!("emit-{name}.stderr")).actual_file(name).run();
+}
+
+fn main() {
+    run_in_tmpdir(|| {
+        run_diff("asm", &[]);
+        run_diff("llvm-ir", &[]);
+        run_diff("dep-info", &["-Zdep-info-omit-d-target=yes"]);
+        run_diff("mir", &[]);
+
+        run_terminal_err_diff("llvm-bc");
+        run_terminal_err_diff("obj");
+        run_terminal_err_diff("metadata");
+        run_terminal_err_diff("link");
+
+        // Test error for emitting multiple types to stdout
+        rustc()
+            .input("test.rs")
+            .emit("asm=-")
+            .emit("llvm-ir=-")
+            .emit("dep-info=-")
+            .emit("mir=-")
+            .stderr(File::create("multiple-types").unwrap())
+            .run_fail();
+        diff().expected_file("emit-multiple-types.stderr").actual_file("multiple-types").run();
+
+        // Same as above, but using `-o`
+        rustc()
+            .input("test.rs")
+            .output("-")
+            .emit("asm,llvm-ir,dep-info,mir")
+            .stderr(File::create("multiple-types-option-o").unwrap())
+            .run_fail();
+        diff()
+            .expected_file("emit-multiple-types.stderr")
+            .actual_file("multiple-types-option-o")
+            .run();
+
+        // Test that `-o -` redirected to a file works correctly (#26719)
+        rustc().input("test.rs").output("-").stdout(File::create("out-stdout").unwrap()).run();
+    });
+}