From 765893e0536ba14202241d3d8b9bab5c061c9aa6 Mon Sep 17 00:00:00 2001
From: Heejin Ahn <aheejin@gmail.com>
Date: Fri, 3 Jul 2026 11:46:08 +0000
Subject: [PATCH] Update preserve list of library update scripts

Following `update_comiler_rt.py`, this updates other update scripts so
that we don't remove files having `emscripten` in their names.
https://github.com/emscripten-core/emscripten/blob/dd4ab289cfc2721ebaef602d400eea381161c4bb/system/lib/update_compiler_rt.py#L35

Also this adds two more missing files (that don't have `emscripten`) in
libcxxabi to its `preserve_files` list so that they don't get deleted
every time `update_libcxxabi.py` runs.
---
 system/lib/update_libcxx.py    | 2 +-
 system/lib/update_libcxxabi.py | 4 ++--
 system/lib/update_libunwind.py | 2 +-
 system/lib/update_llvm_libc.py | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/system/lib/update_libcxx.py b/system/lib/update_libcxx.py
index f8e6ee74c464a..b4557dde0f602 100755
--- a/system/lib/update_libcxx.py
+++ b/system/lib/update_libcxx.py
@@ -34,7 +34,7 @@ def clean_dir(dirname):
   if not os.path.exists(dirname):
     return
   for f in os.listdir(dirname):
-    if f in preserve_files:
+    if f in preserve_files or 'emscripten' in f:
       continue
     full = os.path.join(dirname, f)
     if os.path.isdir(full):
diff --git a/system/lib/update_libcxxabi.py b/system/lib/update_libcxxabi.py
index a939501865563..ad3e75d9e9027 100755
--- a/system/lib/update_libcxxabi.py
+++ b/system/lib/update_libcxxabi.py
@@ -16,12 +16,12 @@
 local_inc = os.path.join(local_root, 'include')
 
 excludes = ('CMakeLists.txt',)
-preserve_files = ()
+preserve_files = ('cxa_exception_js_utils.cpp', '__cpp_exception.S')
 
 
 def clean_dir(dirname):
   for f in os.listdir(dirname):
-    if f in preserve_files:
+    if f in preserve_files or 'emscripten' in f:
       continue
     full = os.path.join(dirname, f)
     if os.path.isdir(full):
diff --git a/system/lib/update_libunwind.py b/system/lib/update_libunwind.py
index f9d4ff8883f77..ad77168d9b59f 100755
--- a/system/lib/update_libunwind.py
+++ b/system/lib/update_libunwind.py
@@ -21,7 +21,7 @@
 
 def clean_dir(dirname):
   for f in os.listdir(dirname):
-    if f in preserve_files:
+    if f in preserve_files or 'emscripten' in f:
       continue
     full = os.path.join(dirname, f)
     if os.path.isdir(full):
diff --git a/system/lib/update_llvm_libc.py b/system/lib/update_llvm_libc.py
index 8508bb792b67b..352ca9e6b23ac 100644
--- a/system/lib/update_llvm_libc.py
+++ b/system/lib/update_llvm_libc.py
@@ -50,7 +50,7 @@ def clean_dir(dirname):
   if not os.path.exists(dirname):
     return
   for f in os.listdir(dirname):
-    if f in preserve_files:
+    if f in preserve_files or 'emscripten' in f:
       continue
     full = os.path.join(dirname, f)
     if os.path.isdir(full):