macOS: export all envoy_dynamic_module_callback_* symbols via visibility pragma (Envoy 5d71bc2f)

dynamic-module-export-fix.patch

From 0d3b9844fb0ef7c0577d300159d939e9a9e4365e Mon Sep 17 00:00:00 2001
From: Dhi Aurrahman <dio@rockybars.com>
Date: Wed, 20 May 2026 13:42:41 +0700
Subject: [PATCH] fix(macos): export all envoy_dynamic_module_callback_*
 symbols

On macOS, only symbols exported in the Mach-O export table are resolvable
via `dlsym` from dynamically loaded modules. Because Envoy is built with
`-fvisibility=hidden`, the `envoy_dynamic_module_callback_*` symbols were
not exported and were removed during the post-build `strip(1)` step.

This caused dynamic modules relying on `dlsym` to fail at runtime even
though the Envoy binary itself still ran correctly.

Wrap the `extern "C"` blocks in both `abi_impl.cc` files with:

  #pragma GCC visibility push(default)
  ...
  #pragma GCC visibility pop

so the callback symbols are exported and survive stripping.

Linux is unaffected because ELF dynamic symbol handling differs from
Mach-O, and these symbols remain available there.
---
 source/extensions/dynamic_modules/abi_impl.cc              | 2 ++
 source/extensions/filters/http/dynamic_modules/abi_impl.cc | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/source/extensions/dynamic_modules/abi_impl.cc b/source/extensions/dynamic_modules/abi_impl.cc
index ef30d36227..6b644fca00 100644
--- a/source/extensions/dynamic_modules/abi_impl.cc
+++ b/source/extensions/dynamic_modules/abi_impl.cc
@@ -31,6 +31,7 @@ absl::flat_hash_map<std::string, void*>
 
 } // namespace
 
+#pragma GCC visibility push(default)
 extern "C" {
 
 bool envoy_dynamic_module_callback_log_enabled(envoy_dynamic_module_type_log_level level) {
@@ -3434,3 +3435,4 @@ __attribute__((weak)) void envoy_dynamic_module_callback_transport_socket_flush_
 }
 
 } // extern "C"
+#pragma GCC visibility pop
diff --git a/source/extensions/filters/http/dynamic_modules/abi_impl.cc b/source/extensions/filters/http/dynamic_modules/abi_impl.cc
index 0f5220fc95..a78b96ae19 100644
--- a/source/extensions/filters/http/dynamic_modules/abi_impl.cc
+++ b/source/extensions/filters/http/dynamic_modules/abi_impl.cc
@@ -448,6 +448,7 @@ getMutableDynamicMetadataListValue(envoy_dynamic_module_type_http_filter_envoy_p
 
 } // namespace
 
+#pragma GCC visibility push(default)
 extern "C" {
 
 envoy_dynamic_module_type_metrics_result
@@ -2435,6 +2436,7 @@ void envoy_dynamic_module_callback_http_clear_route_cluster_cache(
 }
 
 } // extern "C"
+#pragma GCC visibility pop
 } // namespace HttpFilters
 } // namespace DynamicModules
 } // namespace Extensions
-- 
2.42.0