From f8347f1b2d376b5bf19eed03e18e11ecc889e966 Mon Sep 17 00:00:00 2001
From: Ben Barham <ben_barham@apple.com>
Date: Thu, 25 Apr 2024 22:05:10 -0700
Subject: [PATCH] Add option to install targets even when not top level

Also add namespaced targets for any exported target to facilitate
find_package and FetchContent both using the same target names.
---
 cmake/modules/AddSwiftHostLibrary.cmake | 3 ++-
 cmake/modules/CMakeLists.txt            | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/cmake/modules/AddSwiftHostLibrary.cmake b/cmake/modules/AddSwiftHostLibrary.cmake
index f3858efb584..459d0f3cb4f 100644
--- a/cmake/modules/AddSwiftHostLibrary.cmake
+++ b/cmake/modules/AddSwiftHostLibrary.cmake
@@ -130,7 +130,7 @@ function(add_swift_syntax_library name)
     endif()
   endif()
 
-  if(PROJECT_IS_TOP_LEVEL)
+  if(PROJECT_IS_TOP_LEVEL OR SWIFT_SYNTAX_INSTALL_TARGETS)
     # Install this target
     install(TARGETS ${name}
       EXPORT SwiftSyntaxTargets
@@ -148,4 +148,5 @@ function(add_swift_syntax_library name)
   else()
     set_property(GLOBAL APPEND PROPERTY SWIFT_EXPORTS ${name})
   endif()
+  add_library(SwiftSyntax::${name} ALIAS ${name})
 endfunction()
diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
index bb98e4ba873..e29130c8b4e 100644
--- a/cmake/modules/CMakeLists.txt
+++ b/cmake/modules/CMakeLists.txt
@@ -1,4 +1,4 @@
-if(PROJECT_IS_TOP_LEVEL)
+if(PROJECT_IS_TOP_LEVEL OR SWIFT_SYNTAX_INSTALL_TARGETS)
   export(EXPORT SwiftSyntaxTargets
          FILE ${CMAKE_CURRENT_BINARY_DIR}/SwiftSyntaxConfig.cmake
          NAMESPACE SwiftSyntax::)