Merge commit '3a31c6d827' into sync_cg_clif-2021-07-07

compiler/rustc_codegen_cranelift/scripts/cargo.rs

@@ -0,0 +1,70 @@
+use std::env;
+#[cfg(unix)]
+use std::os::unix::process::CommandExt;
+use std::path::PathBuf;
+use std::process::Command;
+
+fn main() {
+    if env::var("RUSTC_WRAPPER").map_or(false, |wrapper| wrapper.contains("sccache")) {
+        eprintln!(
+            "\x1b[1;93m=== Warning: Unsetting RUSTC_WRAPPER to prevent interference with sccache ===\x1b[0m"
+        );
+        env::remove_var("RUSTC_WRAPPER");
+    }
+
+    let sysroot = PathBuf::from(env::current_exe().unwrap().parent().unwrap());
+
+    env::set_var("RUSTC", sysroot.join("bin/cg_clif".to_string() + env::consts::EXE_SUFFIX));
+
+    let mut rustdoc_flags = env::var("RUSTDOCFLAGS").unwrap_or(String::new());
+    rustdoc_flags.push_str(" -Cpanic=abort -Zpanic-abort-tests -Zcodegen-backend=");
+    rustdoc_flags.push_str(
+        sysroot
+            .join(if cfg!(windows) { "bin" } else { "lib" })
+            .join(
+                env::consts::DLL_PREFIX.to_string()
+                    + "rustc_codegen_cranelift"
+                    + env::consts::DLL_SUFFIX,
+            )
+            .to_str()
+            .unwrap(),
+    );
+    rustdoc_flags.push_str(" --sysroot ");
+    rustdoc_flags.push_str(sysroot.to_str().unwrap());
+    env::set_var("RUSTDOCFLAGS", rustdoc_flags);
+
+    // Ensure that the right toolchain is used
+    env::set_var("RUSTUP_TOOLCHAIN", env!("RUSTUP_TOOLCHAIN"));
+
+    let args: Vec<_> = match env::args().nth(1).as_deref() {
+        Some("jit") => {
+            env::set_var(
+                "RUSTFLAGS",
+                env::var("RUSTFLAGS").unwrap_or(String::new()) + " -Cprefer-dynamic",
+            );
+            std::array::IntoIter::new(["rustc".to_string()])
+                .chain(env::args().skip(2))
+                .chain(["--".to_string(), "-Cllvm-args=mode=jit".to_string()])
+                .collect()
+        }
+        Some("lazy-jit") => {
+            env::set_var(
+                "RUSTFLAGS",
+                env::var("RUSTFLAGS").unwrap_or(String::new()) + " -Cprefer-dynamic",
+            );
+            std::array::IntoIter::new(["rustc".to_string()])
+                .chain(env::args().skip(2))
+                .chain(["--".to_string(), "-Cllvm-args=mode=jit-lazy".to_string()])
+                .collect()
+        }
+        _ => env::args().skip(1).collect(),
+    };
+
+    #[cfg(unix)]
+    Command::new("cargo").args(args).exec();
+
+    #[cfg(not(unix))]
+    std::process::exit(
+        Command::new("cargo").args(args).spawn().unwrap().wait().unwrap().code().unwrap_or(1),
+    );
+}