commit c270a4d42898726969ab791ffeba3788e87e3747
author Brian Silverman <bsilver16384@gmail.com> Sat Jul 23 16:08:06 2022 -0700
committer Brian Silverman <bsilver16384@gmail.com> Tue Jul 26 00:17:27 2022 -0700
tree e538289f1ac6a6ad9fae74ab027798d87a987b53
parent 6f53a7bf06112c0472896c36440a5941446c2e13

Support C++ and Rust interop with autocxx

Change-Id: Id2c852bf48ed58d6284e7ab8a388ac38419fc474
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>

build_tests/BUILD

diff --git a/build_tests/BUILD b/build_tests/BUILD
index dc76f45..e7f236a 100644
--- a/build_tests/BUILD
+++ b/build_tests/BUILD
@@ -5,6 +5,7 @@
 load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library", "rust_test")
 load("@npm//@bazel/typescript:index.bzl", "ts_library")
 load("@npm//@bazel/concatjs:index.bzl", "karma_web_test_suite")
+load("//tools/build_rules:autocxx.bzl", "autocxx_library")
 
 cc_test(
     name = "gflags_build_test",
@@ -119,7 +120,11 @@
 
 go_library(
     name = "build_tests_lib",
-    srcs = ["hello.go"],
+    srcs = [
+        "hello.go",
+        # Not sure why gazelle wants this here?
+        "hello_autocxx.h",
+    ],
     importpath = "github.com/frc971/971-Robot-Code/build_tests",
     target_compatible_with = ["@platforms//cpu:x86_64"],
     visibility = ["//visibility:private"],
@@ -191,3 +196,27 @@
     target_compatible_with = ["@platforms//os:linux"],
     deps = [":rust_in_cc_rs"],
 )
+
+cc_library(
+    name = "hello_autocxx_cc",
+    hdrs = [
+        "hello_autocxx.h",
+    ],
+)
+
+autocxx_library(
+    name = "hello_autocxx",
+    srcs = ["hello_autocxx.rs"],
+    libs = [":hello_autocxx_cc"],
+    override_cc_toolchain = "@llvm_toolchain//:cc-clang-x86_64-linux",
+    target_compatible_with = ["//tools/platforms/rust:has_support"],
+)
+
+rust_test(
+    name = "hello_autocxx_test",
+    crate = ":hello_autocxx",
+    # TODO: Make Rust play happy with pic vs nopic. Details at:
+    # https://github.com/bazelbuild/rules_rust/issues/118
+    rustc_flags = ["-Crelocation-model=static"],
+    target_compatible_with = ["//tools/platforms/rust:has_support"],
+)

build_tests/hello_autocxx.h

diff --git a/build_tests/hello_autocxx.h b/build_tests/hello_autocxx.h
new file mode 100644
index 0000000..8b6e285
--- /dev/null
+++ b/build_tests/hello_autocxx.h
@@ -0,0 +1,8 @@
+#ifndef BUILD_TESTS_HELLO_AUTOCXX_H_
+#define BUILD_TESTS_HELLO_AUTOCXX_H_
+
+#include <stdlib.h>
+
+int plain_function() { return 971; }
+
+#endif  // BUILD_TESTS_HELLO_AUTOCXX_H_

build_tests/hello_autocxx.rs

diff --git a/build_tests/hello_autocxx.rs b/build_tests/hello_autocxx.rs
new file mode 100644
index 0000000..483f8be
--- /dev/null
+++ b/build_tests/hello_autocxx.rs
@@ -0,0 +1,16 @@
+use autocxx::include_cpp;
+
+include_cpp! (
+#include "build_tests/hello_autocxx.h"
+generate!("plain_function")
+);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_plain_function() {
+        assert_eq!(autocxx::c_int::from(971), unsafe { ffi::plain_function() });
+    }
+}