[eclipse-iceoryx#349] Make 'posix_generated' available for external b…

…azel builds

iceoryx2-pal/posix/BUILD.bazel

@@ -13,6 +13,7 @@
 package(default_visibility = ["//visibility:public"])
 
 load("@rules_cc//cc:defs.bzl", "cc_library")
+load("@rules_rust//cargo:defs.bzl", "cargo_build_script")
 load("@rules_rust//rust:defs.bzl", "rust_library")
 
 # Generate the binding lib
@@ -36,25 +37,32 @@ genrule(
         "src/c/posix.h",
         "@bindgen//:bindgen-cli",
     ],
-    outs = ["src/posix_generated.rs"],
+    outs = ["posix_generated.rs"],
     cmd = "$(execpath @bindgen//:bindgen-cli) --use-core --blocklist-type max_align_t $(location src/c/posix.h) --output $(OUTS)",
 )
 
+cargo_build_script(
+    name = "bazel_bindgen_workaround",
+    srcs = ["bazel_bindgen_workaround.rs"],
+)
+
 # Create the actual crate
 rust_library(
     name = "iceoryx2-pal-posix",
-    srcs = glob(["src/**/*.rs"]) + [ ":src/posix_generated.rs" ],
+    srcs = glob(["src/**/*.rs"]),
+    compile_data = [ "posix_generated.rs" ],
     deps = [
         "//iceoryx2-pal/concurrency-sync:iceoryx2-pal-concurrency-sync",
         "//iceoryx2-pal/configuration:iceoryx2-pal-configuration",
         "@crate_index//:lazy_static",
         ":iceoryx2-pal-posix-c-lib",
+        ":bazel_bindgen_workaround",
     ],
     rustc_env = {
-        # - the file is generated in 'posix/src'
         # - 'lib.rs' expects the location at 'env!("OUT_DIR")/posix_generated.rs'
-        # - therefore 'OUT_DIR' needs to point to the same dir where 'lib.rs' is located
-        "OUT_DIR": "."
+        # - 'OUT_DIR' is set by 'bazel_bindgen_workaround' and in the same folder like 'posix_generated.rs'
+        # - therefore the path needs to be corrected
+        "BAZEL_BINDGEN_PATH_CORRECTION": "/.."
     },
 )
 

iceoryx2-pal/posix/bazel_bindgen_workaround.rs

@@ -0,0 +1,17 @@
+// Copyright (c) 2024 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache Software License 2.0 which is available at
+// https://www.apache.org/licenses/LICENSE-2.0, or the MIT license
+// which is available at https://opensource.org/licenses/MIT.
+//
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+
+// This file is used to make bazel generate the `OUT_DIR` environment variable
+// to let rustc find the `posix_generated.rs` file
+
+fn main() {}

iceoryx2-pal/posix/build.rs

@@ -58,6 +58,9 @@ fn main() {
         }
     };
 
+    // needed for bazel but can be empty for cargo builds
+    println!("cargo:rustc-env=BAZEL_BINDGEN_PATH_CORRECTION=");
+
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
     bindings
         .write_to_file(out_path.join("posix_generated.rs"))

iceoryx2-pal/posix/src/lib.rs

@@ -20,7 +20,7 @@ pub(crate) mod internal {
     #![allow(improper_ctypes)]
     #![allow(unknown_lints)]
     #![allow(clippy::all)]
-    include!(concat!(env!("OUT_DIR"), "/posix_generated.rs"));
+    include!(concat!(env!("OUT_DIR"), env!("BAZEL_BINDGEN_PATH_CORRECTION"), "/posix_generated.rs"));
 
     pub const ESUCCES: u32 = 0;
 }