codex: drop dead Bazel v8 workarounds (#14225)

codex-rs/code-mode/BUILD.bazel

@@ -12,8 +12,5 @@ rust_library(
         "@crates//:serde",
         "@crates//:serde_json",
     ],
-    rustc_env = {
-        "BAZEL_PACKAGE": "codex-rs/code-mode",
-    },
     visibility = ["//visibility:public"],
 )

codex-rs/code-mode/src/bazel_stub.rs

@@ -8,19 +8,14 @@ pub use api::ExecutionResult;
 pub use api::ToolCallHandler;
 pub use api::ToolKind;
 
-const BAZEL_BUILD: bool = option_env!("BAZEL_PACKAGE").is_some();
 const BAZEL_UNSUPPORTED_REASON: &str = "code_mode is unavailable in Bazel builds";
 
 pub const fn is_supported() -> bool {
-    !BAZEL_BUILD
+    false
 }
 
 pub fn unsupported_reason() -> Option<&'static str> {
-    if BAZEL_BUILD {
-        Some(BAZEL_UNSUPPORTED_REASON)
-    } else {
-        None
-    }
+    Some(BAZEL_UNSUPPORTED_REASON)
 }
 
 pub fn execute(

codex-rs/code-mode/src/libc_stack_end_shim.cc

@@ -1,25 +0,0 @@
-// Bazel's Linux linker setup does not currently resolve V8's
-// `__libc_stack_end` reference from the system runtime. Provide a weak
-// definition and initialize it from the current thread's stack bounds so the
-// prebuilt archive can link and main-thread stack probing still has a sensible
-// fallback.
-#include <pthread.h>
-#include <stddef.h>
-#include <stdint.h>
-
-extern "C" __attribute__((weak)) void* __libc_stack_end = nullptr;
-
-__attribute__((constructor)) static void init_libc_stack_end() {
-  pthread_attr_t attr;
-  if (pthread_getattr_np(pthread_self(), &attr) != 0) {
-    return;
-  }
-
-  void* base = nullptr;
-  size_t size = 0;
-  if (pthread_attr_getstack(&attr, &base, &size) == 0 && base != nullptr) {
-    __libc_stack_end = static_cast<uint8_t*>(base) + size;
-  }
-
-  pthread_attr_destroy(&attr);
-}