From 7a03e8ffc8d2ced9aa4d552f4e679d80083ff93b Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <abdulras@thebrowser.company>
Date: Thu, 4 Sep 2025 09:58:53 -0700
Subject: [PATCH] ASTGen: prevent _StringProcessing from being loaded

When building the ASTGen library, we are building `_StringProcessing`.
If the SDK version is loaded, it causes confusion over the local
definition and the SDK definition. Avoid the implicit loading of the
module.
---
 lib/ASTGen/CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/ASTGen/CMakeLists.txt b/lib/ASTGen/CMakeLists.txt
index 46d88fef49174..9f6e76a4bee34 100644
--- a/lib/ASTGen/CMakeLists.txt
+++ b/lib/ASTGen/CMakeLists.txt
@@ -14,6 +14,8 @@ if(SWIFT_BUILD_REGEX_PARSER_IN_COMPILER)
   add_pure_swift_host_library(_CompilerRegexParser STATIC
     "${COMPILER_REGEX_PARSER_SOURCES}"
   )
+  target_compile_options(_CompilerRegexParser PRIVATE
+    -disable-implicit-string-processing-module-import)
 else()
   # Dummy target for dependencies
   add_custom_target(_CompilerRegexParser)