Remove failure when bindgen cc_lib does not contain static library

bindgen/private/bindgen.bzl

@@ -152,11 +152,6 @@ def _generate_cc_link_build_info(ctx, cc_lib):
                 linker_search_paths.append(lib.pic_static_library.dirname)
                 compile_data.append(lib.pic_static_library)
 
-    if not compile_data:
-        fail("No static libraries found in {}".format(
-            cc_lib.label,
-        ))
-
     rustc_flags_file = ctx.actions.declare_file("{}.rustc_flags".format(ctx.label.name))
     ctx.actions.write(
         output = rustc_flags_file,

examples/bindgen/BUILD.bazel

@@ -14,11 +14,30 @@ rust_bindgen_library(
 
 rust_binary(
     name = "simple_example",
-    srcs = ["main.rs"],
+    srcs = ["simple.rs"],
     deps = [":simple_bindgen"],
 )
 
 rust_test(
     name = "simple_test",
     crate = ":simple_example",
 )
+
+rust_bindgen_library(
+    name = "hello_c_bindgen",
+    bindgen_flags = [
+        "--allowlist-function=hello",
+    ],
+    cc_lib = "//bindgen/shared:hello_c",
+    crate_name = "hello_c",
+    header = "//bindgen/shared:hello.h",
+)
+
+rust_binary(
+    name = "shared_example",
+    srcs = ["shared.rs"],
+    deps = [
+        ":hello_c_bindgen",
+        "//bindgen/shared:hello_rs",
+    ],
+)

examples/bindgen/shared.rs

@@ -0,0 +1,4 @@
+fn main() {
+    hello_rs::hello();
+    unsafe { hello_c::hello() };
+}

examples/bindgen/shared/BUILD.bazel

@@ -0,0 +1,36 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+load("@rules_rust//bindgen:defs.bzl", "rust_bindgen")
+load("@rules_rust//rust:defs.bzl", "rust_library")
+
+package(default_visibility = ["//bindgen:__pkg__"])
+
+cc_library(
+    name = "greeting",
+    hdrs = ["greeting.h"],
+)
+
+rust_bindgen(
+    name = "greeting_bindgen",
+    bindgen_flags = [
+        "--allowlist-var=GREETING",
+        "--generate-cstr",
+    ],
+    cc_lib = ":greeting",
+    header = "greeting.h",
+)
+
+rust_library(
+    name = "hello_rs",
+    srcs = [
+        "hello.rs",
+        ":greeting_bindgen",
+    ],
+    crate_root = "hello.rs",
+)
+
+cc_library(
+    name = "hello_c",
+    srcs = ["hello.c"],
+    hdrs = ["hello.h"],
+    deps = [":greeting"],
+)

examples/bindgen/shared/greeting.h

@@ -0,0 +1,6 @@
+#ifndef __FFI_H_INCLUDE__
+#define __FFI_H_INCLUDE__
+
+#define GREETING "Hello"
+
+#endif  // __FFI_H_INCLUDE__

examples/bindgen/shared/hello.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+#include "greeting.h"
+
+void hello(void) { printf("%s from C!\n", GREETING); }

examples/bindgen/shared/hello.h

@@ -0,0 +1,6 @@
+#ifndef HELLO_H_INCLUDE__
+#define HELLO_H_INCLUDE__
+
+void hello(void);
+
+#endif  // HELLO_H_INCLUDE__

examples/bindgen/shared/hello.rs

@@ -0,0 +1,6 @@
+mod greeting_bindgen;
+
+pub fn hello() {
+    let greeting = greeting_bindgen::GREETING.to_str().unwrap();
+    println!("{greeting} from Rust!");
+}