Rollup merge of #124473 - Urgau:port-print-cfg, r=jieyouxu

Port `print-cfg` run-make test to Rust-based rmake.rs

This PR port the `print-cfg` run-make test to Rust-based rmake.rs tests.

The actual test is now split in two:
 - the first part for the `--print=cfg` part
 - and the second part for the `=PATH` part of `--print`

Part of #121876.

r? `@jieyouxu`

Author: matthiaskrgr

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -219,7 +219,6 @@ run-make/prefer-rlib/Makefile
 run-make/pretty-print-to-file/Makefile
 run-make/pretty-print-with-dep-file/Makefile
 run-make/print-calling-conventions/Makefile
-run-make/print-cfg/Makefile
 run-make/print-target-list/Makefile
 run-make/profile/Makefile
 run-make/prune-link-args/Makefile

tests/run-make/print-cfg/Makefile

@@ -0,0 +1,106 @@
+//! This checks the output of `--print=cfg`
+//!
+//! Specifically it checks that output is correctly formatted
+//! (ie. no duplicated cfgs, values are between "", names are not).
+//!
+//! It also checks that some targets have the correct set cfgs.
+
+extern crate run_make_support;
+
+use std::collections::HashSet;
+use std::ffi::OsString;
+use std::io::BufRead;
+use std::iter::FromIterator;
+
+use run_make_support::{rustc, tmp_dir};
+
+struct PrintCfg {
+    target: &'static str,
+    includes: &'static [&'static str],
+    disallow: &'static [&'static str],
+}
+
+fn main() {
+    check(PrintCfg {
+        target: "x86_64-pc-windows-gnu",
+        includes: &["windows", "target_arch=\"x86_64\""],
+        disallow: &["unix"],
+    });
+    check(PrintCfg {
+        target: "i686-pc-windows-msvc",
+        includes: &["windows", "target_env=\"msvc\""],
+        disallow: &["unix"],
+    });
+    check(PrintCfg {
+        target: "i686-apple-darwin",
+        includes: &["unix", "target_os=\"macos\"", "target_vendor=\"apple\""],
+        disallow: &["windows"],
+    });
+    check(PrintCfg {
+        target: "i686-unknown-linux-gnu",
+        includes: &["unix", "target_env=\"gnu\""],
+        disallow: &["windows"],
+    });
+    check(PrintCfg {
+        target: "arm-unknown-linux-gnueabihf",
+        includes: &["unix", "target_abi=\"eabihf\""],
+        disallow: &["windows"],
+    });
+}
+
+fn check(PrintCfg { target, includes, disallow }: PrintCfg) {
+    fn check_(output: &str, includes: &[&str], disallow: &[&str]) {
+        let mut found = HashSet::<String>::new();
+        let mut recorded = HashSet::<String>::new();
+
+        for l in output.lines() {
+            assert!(l == l.trim());
+            if let Some((left, right)) = l.split_once('=') {
+                assert!(right.starts_with("\""));
+                assert!(right.ends_with("\""));
+                assert!(!left.contains("\""));
+            } else {
+                assert!(!l.contains("\""));
+            }
+
+            assert!(recorded.insert(l.to_string()), "duplicated: {}", &l);
+            assert!(!disallow.contains(&l), "found disallowed: {}", &l);
+            if includes.contains(&l) {
+                assert!(found.insert(l.to_string()), "duplicated (includes): {}", &l);
+            }
+        }
+
+        let should_found = HashSet::<String>::from_iter(includes.iter().map(|s| s.to_string()));
+        let diff: Vec<_> = should_found.difference(&found).collect();
+
+        assert!(
+            diff.is_empty(),
+            "expected: {:?}, found: {:?} (~ {:?})",
+            &should_found,
+            &found,
+            &diff
+        );
+    }
+
+    // --print=cfg
+    {
+        let output = rustc().target(target).print("cfg").run();
+
+        let stdout = String::from_utf8(output.stdout).unwrap();
+
+        check_(&stdout, includes, disallow);
+    }
+
+    // --print=cfg=PATH
+    {
+        let tmp_path = tmp_dir().join(format!("{target}.cfg"));
+        let mut print_arg = OsString::from("--print=cfg=");
+        print_arg.push(tmp_path.as_os_str());
+
+        let output = rustc().target(target).arg(print_arg).run();
+
+        let output = std::fs::read_to_string(&tmp_path).unwrap();
+
+        check_(&output, includes, disallow);
+    }
+}

tests/run-make/print-cfg/rmake.rs

@@ -0,0 +1,68 @@
+//! This checks the output of some `--print` options when
+//! output to a file (instead of stdout)
+
+extern crate run_make_support;
+
+use std::ffi::OsString;
+
+use run_make_support::{rustc, target, tmp_dir};
+
+struct Option<'a> {
+    target: &'a str,
+    option: &'static str,
+    includes: &'static [&'static str],
+}
+
+fn main() {
+    // Printed from CodegenBackend trait impl in rustc_codegen_llvm/src/lib.rs
+    check(Option {
+        target: &target(),
+        option: "relocation-models",
+        includes: &["dynamic-no-pic"],
+    });
+
+    // Printed by compiler/rustc_codegen_llvm/src/llvm_util.rs
+    check(Option {
+        target: "wasm32-unknown-unknown",
+        option: "target-features",
+        includes: &["reference-types"],
+    });
+
+    // Printed by C++ code in rustc_llvm/llvm-wrapper/PassWrapper.cpp
+    check(Option {
+        target: "wasm32-unknown-unknown",
+        option: "target-cpus",
+        includes: &["generic"],
+    });
+}
+
+fn check(args: Option) {
+    fn check_(output: &str, includes: &[&str]) {
+        for i in includes {
+            assert!(output.contains(i), "output doesn't contains: {}", i);
+        }
+    }
+
+    // --print={option}
+    let stdout = {
+        let output = rustc().target(args.target).print(args.option).run();
+
+        String::from_utf8(output.stdout).unwrap()
+    };
+
+    // --print={option}=PATH
+    let output = {
+        let tmp_path = tmp_dir().join(format!("{}.txt", args.option));
+        let mut print_arg = OsString::from(format!("--print={}=", args.option));
+        print_arg.push(tmp_path.as_os_str());
+
+        let _output = rustc().target(args.target).arg(print_arg).run();
+
+        std::fs::read_to_string(&tmp_path).unwrap()
+    };
+
+    check_(&stdout, args.includes);
+    check_(&output, args.includes);
+
+    assert_eq!(&stdout, &output);
+}