From c88e1de7277a788976deecf68774f564acef86a2 Mon Sep 17 00:00:00 2001
From: hauntsaninja <hauntsaninja@gmail.com>
Date: Wed, 21 Oct 2026 22:13:44 -0700
Subject: [PATCH] [mypyc] hide internal symbols

Codex claims this is about a 5% speed-up on self check on Linux

Authored by Codex
---
 mypyc/build.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mypyc/build.py b/mypyc/build.py
index e61c09a463ee..9050eef18d27 100644
--- a/mypyc/build.py
+++ b/mypyc/build.py
@@ -843,6 +843,9 @@ def get_cflags(
         cflags += [
             f"-O{opt_level}",
             f"-g{debug_level}",
+            # Native groups exchange functions and data through export capsules.
+            # PyMODINIT_FUNC keeps Python module entry points publicly visible.
+            "-fvisibility=hidden",
             "-Werror",
             "-Wno-unused-function",
             "-Wno-unused-label",