WIP

Author: Kobzol

src/bootstrap/src/core/build_steps/gcc.rs

@@ -112,16 +112,42 @@ impl Step for Gcc {
             return true;
         }
 
-        command(root.join("contrib/download_prerequisites")).current_dir(&root).run(builder);
-        command(root.join("configure"))
+        let deps_dir = out_dir.join("deps");
+        t!(fs::create_dir_all(&deps_dir));
+
+        // Download dependencies into the build directory, to avoid modifying the source dir
+        // The configure script should automatically find them in the build directory
+        command(root.join("contrib/download_prerequisites"))
+            .current_dir(&root)
+            .arg("--directory")
+            .arg(deps_dir)
+            .run(builder);
+
+        let mut configure_cmd = command(root.join("configure"));
+        configure_cmd
             .current_dir(&out_dir)
             .arg("--enable-host-shared")
             .arg("--enable-languages=jit")
             .arg("--enable-checking=release")
             .arg("--disable-bootstrap")
             .arg("--disable-multilib")
-            .arg(format!("--prefix={}", install_dir.display()))
-            .run(builder);
+            .arg(format!("--prefix={}", install_dir.display()));
+        let mut cc = builder.build.cc(target).display().to_string();
+        if let Some(ref ccache) = builder.build.config.ccache {
+            cc = format!("{ccache} {cc}");
+        }
+        configure_cmd.env("CC", cc);
+
+        if let Ok(ref cxx) = builder.build.cxx(target) {
+            let mut cxx = cxx.display().to_string();
+            if let Some(ref ccache) = builder.build.config.ccache {
+                cxx = format!("{ccache} {cxx}");
+            }
+            configure_cmd.env("CXX", cxx);
+        }
+
+        configure_cmd.run(builder);
+
         command("make").current_dir(&out_dir).arg(format!("-j{}", builder.jobs())).run(builder);
         command("make").current_dir(&out_dir).arg("install").run(builder);