[eclipse-iceoryx#439] Use prebuilt bindgen

WORKSPACE.bazel

@@ -59,16 +59,20 @@ rust_register_toolchains(
 )
 
 
-# Load bindgen rules
-load("@rules_rust//bindgen:repositories.bzl", "rust_bindgen_dependencies", "rust_bindgen_register_toolchains")
-
-rust_bindgen_dependencies()
-
-rust_bindgen_register_toolchains()
-
-load("@rules_rust//bindgen:transitive_repositories.bzl", "rust_bindgen_transitive_dependencies")
-
-rust_bindgen_transitive_dependencies()
+# Load prebuilt bindgen
+http_archive(
+    name = "bindgen",
+    sha256 = "b7e2321ee8c617f14ccc5b9f39b3a804db173ee217e924ad93ed16af6bc62b1d",
+    strip_prefix = "bindgen-cli-x86_64-unknown-linux-gnu",
+    urls = ["https://github.com/rust-lang/rust-bindgen/releases/download/v0.69.5/bindgen-cli-x86_64-unknown-linux-gnu.tar.xz"],
+    build_file_content = """
+filegroup(
+    name = "bindgen-cli",
+    srcs = ["bindgen"],
+    visibility = ["//visibility:public"],
+)
+    """,
+)
 
 
 # Load external crates

iceoryx2-pal/posix/BUILD.bazel

@@ -14,7 +14,6 @@ package(default_visibility = ["//visibility:public"])
 
 load("@rules_cc//cc:defs.bzl", "cc_library")
 load("@rules_rust//rust:defs.bzl", "rust_library")
-load("@rules_rust//bindgen:defs.bzl", "rust_bindgen_library")
 
 # Generate the binding lib
 cc_library(
@@ -31,29 +30,31 @@ cc_library(
 )
 
 # Generate the Rust binding file
-# This will generate 'posix_generated__bindgen.rs'
-rust_bindgen_library(
-    name = "posix_generated",
-    bindgen_flags = [
-        "--blocklist-type=max_align_t",
+genrule(
+    name = "iceoryx2-pal-posix-bindgen",
+    srcs = [
+        "src/c/posix.h",
+        "@bindgen//:bindgen-cli",
     ],
-    cc_lib = "iceoryx2-pal-posix-c-lib",
-    header = "src/c/posix.h",
-    wrap_static_fns = True,
+    outs = ["src/posix_generated.rs"],
+    cmd = "$(execpath @bindgen//:bindgen-cli) --use-core --blocklist-type max_align_t $(location src/c/posix.h) --output $(OUTS)",
 )
 
 # Create the actual crate
 rust_library(
     name = "iceoryx2-pal-posix",
-    srcs = glob(["src/**/*.rs"]) + [ ":posix_generated__bindgen.rs" ],
+    srcs = glob(["src/**/*.rs"]) + [ ":src/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",
     ],
     rustc_env = {
-        "OUT_DIR": ".." # the file is generated in 'posix', not in 'posix/src' where the 'lib.rs' is located; therefore the relative path of '..'
+        # - 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": "."
     },
 )
 

iceoryx2-pal/posix/build.rs

@@ -59,11 +59,8 @@ fn main() {
     };
 
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-    // bazel generates 'posix_generated__bindgen.rs' and there is no way to set the name
-    // the simplest solution is to use the same name here; the workaround in bazel would
-    // require to have a 'genrule' and copy the file
     bindings
-        .write_to_file(out_path.join("posix_generated__bindgen.rs"))
+        .write_to_file(out_path.join("posix_generated.rs"))
         .expect("Couldn't write bindings!");
 
     println!("cargo:rerun-if-changed=src/c/sigaction.c");

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__bindgen.rs"));
+    include!(concat!(env!("OUT_DIR"), "/posix_generated.rs"));
 
     pub const ESUCCES: u32 = 0;
 }