Import n2 to androidupstream

Test: m n2
Third-Party Import of: https://github.com/evmar/n2
Request Document: go/android3p
For CL Reviewers: go/android3p#reviewing-a-cl
For Build Team: go/ab-third-party-imports
Bug: http://b/328273370
Original import of the code can be found at: https://googleplex-android.googlesource.com/platform/external/n2/+/refs/heads/third-party-review.
Security Questionnaire: http://b/328273370#comment1

Change-Id: Iab199b146d606cb1e8212f5c38d8612a5845b6bf

5 files changed, 55 insertions, 5 deletions

diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..a1b1b4b
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,33 @@
+
+// TODO: Add a module for the tests. The tests require libfiletime, which is not in android.
+
+rust_library_host {
+    name: "libn2",
+    crate_name: "n2",
+    srcs: ["src/lib.rs"],
+    edition: "2018",
+    cargo_env_compat: true,
+    // n2 prints the value of CARGO_PKG_VERSION when using the --version argument, we need to set
+    // this property to define the environment variable, but don't actually care about the value.
+    cargo_pkg_version: "android",
+    rustlibs: [
+        "libanyhow",
+        "libargh",
+        "liblibc",
+        "librustc_hash",
+    ],
+}
+
+rust_binary_host {
+    name: "n2",
+    crate_name: "n2",
+    srcs: ["src/main.rs"],
+    edition: "2018",
+    rustlibs: [
+        "libn2",
+        "libanyhow",
+        "libargh",
+        "liblibc",
+        "librustc_hash",
+    ],
+}
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..d86949a
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,14 @@
+name: "n2"
+description: "an alternative ninja implementation"
+
+third_party {
+  homepage: "https://github.com/evmar/n2"
+  identifier {
+    type: "Git"
+    value: "https://github.com/evmar/n2"
+    primary_source: true
+  }
+  version: "8881a661ae63e1124eb47b45f08d9fa1225a5f00"
+  license_type: NOTICE
+  last_upgrade_date { year: 2024 month: 3 day: 21 }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..412db17
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,2 @@
+include platform/build/soong:main:/OWNERS
+include platform/system/core:main:/janitors/OWNERS
diff --git a/src/lib.rs b/src/lib.rs
index c1e8cb0..0989e56 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -22,9 +22,10 @@ mod terminal;
 mod trace;
 mod work;
 
-#[cfg(not(any(windows, target_arch = "wasm32")))]
-use jemallocator::Jemalloc;
+// TODO: Import Jemalloc into android and re-enable it here.
+// #[cfg(not(any(windows, target_arch = "wasm32")))]
+// use jemallocator::Jemalloc;
 
-#[cfg(not(any(windows, target_arch = "wasm32")))]
-#[global_allocator]
-static GLOBAL: Jemalloc = Jemalloc;
+// #[cfg(not(any(windows, target_arch = "wasm32")))]
+// #[global_allocator]
+// static GLOBAL: Jemalloc = Jemalloc;