Rewrite core-no-fp-fmt-parse in Rust

Rewrite core-no-fp-fmt-parse in Rust

fix: missing import

fix: tidiness check

more tidy checks

remove tidy line length ignore

Author: Oneirical

Diff for: src/tools/run-make-support/src/rustc.rs

@@ -1,5 +1,6 @@
 use std::env;
 use std::path::Path;
+use std::path::PathBuf;
 use std::process::{Command, Output};
 
 use crate::{handle_failed_output, tmp_dir};
@@ -104,6 +105,13 @@ impl Rustc {
         self
     }
 
+    /// Generic file path provider.
+    pub fn arg_path(&mut self, path: &[&str]) -> &mut Self {
+        let path_buf = path.iter().collect::<PathBuf>();
+        self.cmd.arg(path_buf.to_str().unwrap());
+        self
+    }
+
     /// Generic command arguments provider. Use `.arg("-Zname")` over `.arg("-Z").arg("arg")`.
     /// This method will panic if a plain `-Z` or `-C` is passed, or if `-Z <name>` or `-C <name>`
     /// is passed (note the space).

Diff for: src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -31,7 +31,6 @@ run-make/compiler-rt-works-on-mingw/Makefile
 run-make/compressed-debuginfo/Makefile
 run-make/const-prop-lint/Makefile
 run-make/const_fn_mir/Makefile
-run-make/core-no-fp-fmt-parse/Makefile
 run-make/core-no-oom-handling/Makefile
 run-make/crate-data-smoke/Makefile
 run-make/crate-hash-rustc-version/Makefile

Diff for: tests/run-make/core-no-fp-fmt-parse/Makefile

@@ -0,0 +1,20 @@
+// This test checks that the core library of Rust can be compiled without enabling
+// support for formatting and parsing floating-point numbers.
+
+extern crate run_make_support;
+
+use run_make_support::rustc;
+use std::path::PathBuf;
+
+fn main() {
+    rustc()
+        .arg("--edition")
+        .arg("2021")
+        .arg("-Dwarnings")
+        .arg("--crate-type")
+        .arg("rlib")
+        .arg_path(&["..", "..", "..", "library", "core", "src", "lib.rs"])
+        .arg("--cfg")
+        .arg("no_fp_fmt_parse")
+        .run();
+}