From 69f5db11f4140ec92b4a7812c9a11382a0816f6d Mon Sep 17 00:00:00 2001
From: Rintaro Ishizaki <rishizaki@apple.com>
Date: Sat, 14 Oct 2023 06:17:40 +0000
Subject: [PATCH] [CMake] Add option to specify '-module-abi-name'

Add 'SWIFT_MODULE_ABI_NAME_PREFIX' CMake variable. This can be used from
compiler's CMake so its swift-syntax libraries can have unique names.
That avoids symbol name conflicts when compiler libraries (e.g.
sourcekitdInProc) is used from binaries linking with swift-syntax (e.g.
via SwiftPM)

https://github.com/apple/swift/issues/68812
rdar://116951101
---
 CMakeLists.txt                          | 2 ++
 cmake/modules/AddSwiftHostLibrary.cmake | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b2cf7ad094..928f3a2b8a6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,8 @@ if(CMAKE_VERSION VERSION_LESS 3.21)
   endif()
 endif()
 
+set(SWIFT_MODULE_ABI_NAME_PREFIX CACHE STRING "ABI name prefix to avoid name conflicts")
+
 # The subdirectory into which host libraries will be installed.
 set(SWIFT_HOST_LIBRARIES_SUBDIRECTORY "swift/host")
 
diff --git a/cmake/modules/AddSwiftHostLibrary.cmake b/cmake/modules/AddSwiftHostLibrary.cmake
index 7a4d22e47d7..e8e6e4c717b 100644
--- a/cmake/modules/AddSwiftHostLibrary.cmake
+++ b/cmake/modules/AddSwiftHostLibrary.cmake
@@ -77,7 +77,14 @@ function(add_swift_syntax_library name)
       -emit-module-path;${module_file};
       -emit-module-source-info-path;${module_sourceinfo_file};
       -emit-module-interface-path;${module_interface_file}
+    >)
+  if(SWIFT_MODULE_ABI_NAME_PREFIX)
+    target_compile_options("${name}" PRIVATE
+      $<$<COMPILE_LANGUAGE:Swift>:
+        "SHELL:-Xfrontend -module-abi-name"
+        "SHELL:-Xfrontend ${SWIFT_MODULE_ABI_NAME_PREFIX}${name}"
       >)
+  endif()
 
   if(CMAKE_VERSION VERSION_LESS 3.26.0 AND SWIFT_SYNTAX_ENABLE_WMO_PRE_3_26)
     target_compile_options(${name} PRIVATE