Merge commit 'e8dca3e87d' into sync_from_cg_gcc

compiler/rustc_codegen_gcc/tests/lang_tests_common.rs

@@ -0,0 +1,68 @@
+//! The common code for `tests/lang_tests_*.rs`
+use std::{
+    env::{self, current_dir},
+    path::PathBuf,
+    process::Command,
+};
+
+use lang_tester::LangTester;
+use tempfile::TempDir;
+
+/// Controls the compile options (e.g., optimization level) used to compile
+/// test code.
+#[allow(dead_code)] // Each test crate picks one variant
+pub enum Profile {
+    Debug,
+    Release,
+}
+
+pub fn main_inner(profile: Profile) {
+    let tempdir = TempDir::new().expect("temp dir");
+    let current_dir = current_dir().expect("current dir");
+    let current_dir = current_dir.to_str().expect("current dir").to_string();
+    let gcc_path = include_str!("../gcc_path");
+    let gcc_path = gcc_path.trim();
+    env::set_var("LD_LIBRARY_PATH", gcc_path);
+    LangTester::new()
+        .test_dir("tests/run")
+        .test_file_filter(|path| path.extension().expect("extension").to_str().expect("to_str") == "rs")
+        .test_extract(|source| {
+            let lines =
+                source.lines()
+                    .skip_while(|l| !l.starts_with("//"))
+                    .take_while(|l| l.starts_with("//"))
+                    .map(|l| &l[2..])
+                    .collect::<Vec<_>>()
+                    .join("\n");
+            Some(lines)
+        })
+        .test_cmds(move |path| {
+            // Test command 1: Compile `x.rs` into `tempdir/x`.
+            let mut exe = PathBuf::new();
+            exe.push(&tempdir);
+            exe.push(path.file_stem().expect("file_stem"));
+            let mut compiler = Command::new("rustc");
+            compiler.args(&[
+                &format!("-Zcodegen-backend={}/target/debug/librustc_codegen_gcc.so", current_dir),
+                "--sysroot", &format!("{}/build_sysroot/sysroot/", current_dir),
+                "-Zno-parallel-llvm",
+                "-C", "panic=abort",
+                "-C", "link-arg=-lc",
+                "-o", exe.to_str().expect("to_str"),
+                path.to_str().expect("to_str"),
+            ]);
+            match profile {
+                Profile::Debug => {}
+                Profile::Release => {
+                    compiler.args(&[
+                        "-C", "opt-level=3",
+                        "-C", "lto=no",
+                    ]);
+                }
+            }
+            // Test command 2: run `tempdir/x`.
+            let runtime = Command::new(exe);
+            vec![("Compiler", compiler), ("Run-time", runtime)]
+        })
+        .run();
+}