Apple: Fix linking to frameworks that do not exist until build time

Fixes: #21621

4 files changed, 31 insertions, 0 deletions

diff --git a/Tests/Framework/CMakeLists.txt b/Tests/Framework/CMakeLists.txt
index a313c2c..f741ec2 100644
--- a/Tests/Framework/CMakeLists.txt
+++ b/Tests/Framework/CMakeLists.txt
@@ -84,3 +84,19 @@ if(NOT XCODE OR NOT XCODE_VERSION VERSION_LESS 5)
 endif()
 
 include(CPack)
+
+if(APPLE)
+  set(ExternalFramework_INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/External")
+  file(REMOVE_RECURSE "${ExternalFramework_INSTALL_DIR}")
+
+  include(ExternalProject)
+  ExternalProject_Add(ExternalFramework
+    SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/External"
+    INSTALL_DIR "${ExternalFramework_INSTALL_DIR}"
+    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
+  )
+
+  add_executable(useExternal useExternal.c)
+  target_link_libraries(useExternal PRIVATE "${ExternalFramework_INSTALL_DIR}/lib/External.framework")
+  add_dependencies(useExternal ExternalFramework)
+endif()
diff --git a/Tests/Framework/External/CMakeLists.txt b/Tests/Framework/External/CMakeLists.txt
new file mode 100644
index 0000000..b9128fd
--- /dev/null
+++ b/Tests/Framework/External/CMakeLists.txt
@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.19)
+project(ExternalFramework C)
+add_library(External SHARED external.c)
+set_property(TARGET External PROPERTY FRAMEWORK 1)
+install(TARGETS External DESTINATION lib)
diff --git a/Tests/Framework/External/external.c b/Tests/Framework/External/external.c
new file mode 100644
index 0000000..8441e71
--- /dev/null
+++ b/Tests/Framework/External/external.c
@@ -0,0 +1,4 @@
+int external(void)
+{
+  return 0;
+}
diff --git a/Tests/Framework/useExternal.c b/Tests/Framework/useExternal.c
new file mode 100644
index 0000000..8494b15
--- /dev/null
+++ b/Tests/Framework/useExternal.c
@@ -0,0 +1,6 @@
+extern int external(void);
+
+int main(void)
+{
+  return external();
+}