Wire realtime WebRTC native media into Bazel (#17145)

- Builds codex-realtime-webrtc through the normal Bazel Rust macro so
native macOS WebRTC sources are included.\n- Shares the macOS -ObjC link
flag with Bazel targets that can link libwebrtc.

---------

Co-authored-by: Codex <noreply@openai.com>

codex-rs/cli/BUILD.bazel

@@ -1,8 +1,9 @@
-load("//:defs.bzl", "codex_rust_crate", "multiplatform_binaries")
+load("//:defs.bzl", "MACOS_WEBRTC_RUSTC_LINK_FLAGS", "codex_rust_crate", "multiplatform_binaries")
 
 codex_rust_crate(
     name = "cli",
     crate_name = "codex_cli",
+    rustc_flags_extra = MACOS_WEBRTC_RUSTC_LINK_FLAGS,
 )
 
 multiplatform_binaries(

codex-rs/cloud-tasks/BUILD.bazel

@@ -1,6 +1,7 @@
-load("//:defs.bzl", "codex_rust_crate")
+load("//:defs.bzl", "MACOS_WEBRTC_RUSTC_LINK_FLAGS", "codex_rust_crate")
 
 codex_rust_crate(
     name = "cloud-tasks",
     crate_name = "codex_cloud_tasks",
+    rustc_flags_extra = MACOS_WEBRTC_RUSTC_LINK_FLAGS,
 )

codex-rs/realtime-webrtc/BUILD.bazel

@@ -1,12 +1,7 @@
-load("@rules_rust//rust:defs.bzl", "rust_library")
+load("//:defs.bzl", "MACOS_WEBRTC_RUSTC_LINK_FLAGS", "codex_rust_crate")
 
-rust_library(
+codex_rust_crate(
     name = "realtime-webrtc",
     crate_name = "codex_realtime_webrtc",
-    crate_root = "src/lib.rs",
-    srcs = ["src/lib.rs"],
-    edition = "2024",
-    rustc_flags = ["--cfg=codex_bazel"],
-    deps = ["@crates//:thiserror"],
-    visibility = ["//visibility:public"],
+    rustc_flags_extra = MACOS_WEBRTC_RUSTC_LINK_FLAGS,
 )

codex-rs/realtime-webrtc/src/lib.rs

@@ -1,4 +1,4 @@
-#[cfg(all(target_os = "macos", not(codex_bazel)))]
+#[cfg(target_os = "macos")]
 mod native;
 
 use std::fmt;
@@ -31,7 +31,7 @@ pub struct StartedRealtimeWebrtcSession {
 }
 
 pub struct RealtimeWebrtcSessionHandle {
-    #[cfg(all(target_os = "macos", not(codex_bazel)))]
+    #[cfg(target_os = "macos")]
     inner: native::SessionHandle,
     local_audio_peak: Arc<AtomicU16>,
 }
@@ -45,11 +45,11 @@ impl fmt::Debug for RealtimeWebrtcSessionHandle {
 
 impl RealtimeWebrtcSessionHandle {
     pub fn apply_answer_sdp(&self, answer_sdp: String) -> Result<()> {
-        #[cfg(all(target_os = "macos", not(codex_bazel)))]
+        #[cfg(target_os = "macos")]
         {
             self.inner.apply_answer_sdp(answer_sdp)
         }
-        #[cfg(any(not(target_os = "macos"), codex_bazel))]
+        #[cfg(not(target_os = "macos"))]
         {
             let _ = answer_sdp;
             Err(RealtimeWebrtcError::UnsupportedPlatform)
@@ -57,7 +57,7 @@ impl RealtimeWebrtcSessionHandle {
     }
 
     pub fn close(&self) {
-        #[cfg(all(target_os = "macos", not(codex_bazel)))]
+        #[cfg(target_os = "macos")]
         self.inner.close();
     }
 
@@ -70,7 +70,7 @@ pub struct RealtimeWebrtcSession;
 
 impl RealtimeWebrtcSession {
     pub fn start() -> Result<StartedRealtimeWebrtcSession> {
-        #[cfg(all(target_os = "macos", not(codex_bazel)))]
+        #[cfg(target_os = "macos")]
         {
             let started = native::start()?;
             Ok(StartedRealtimeWebrtcSession {
@@ -82,7 +82,7 @@ impl RealtimeWebrtcSession {
                 events: started.events,
             })
         }
-        #[cfg(any(not(target_os = "macos"), codex_bazel))]
+        #[cfg(not(target_os = "macos"))]
         {
             Err(RealtimeWebrtcError::UnsupportedPlatform)
         }

codex-rs/tui/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//:defs.bzl", "codex_rust_crate")
+load("//:defs.bzl", "MACOS_WEBRTC_RUSTC_LINK_FLAGS", "codex_rust_crate")
 
 codex_rust_crate(
     name = "tui",
@@ -23,4 +23,5 @@ codex_rust_crate(
     extra_binaries = [
         "//codex-rs/cli:codex",
     ],
+    rustc_flags_extra = MACOS_WEBRTC_RUSTC_LINK_FLAGS,
 )