Tests: Add Xcode cases fixed by switch to the "new build system"

Support of 'new build system' in Xcode fixes indirectly few issues
which were caused by workaround with `XCODE_DEPEND_HELPER.cmake`
autogenerated script.

This patch adds test which is originated from issue #20260 and
reproduces this issue when 'new build system' is disabled.

Fixes: #20260

Tests/RunCMake/XcodeProject/RunCMakeTest.cmake

@@ -51,6 +51,35 @@ run_cmake(PerConfigPerSourceOptions)
 run_cmake(PerConfigPerSourceDefinitions)
 run_cmake(PerConfigPerSourceIncludeDirs)
 
+if(XCODE_VERSION VERSION_GREATER_EQUAL 12)
+
+  function(XcodeObjectLibsInTwoProjectsiOS)
+    set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeObjectLibsInTwoProjects-build-ios)
+    set(RunCMake_TEST_OPTIONS "-DCMAKE_SYSTEM_NAME=iOS")
+
+    run_cmake(XcodeObjectLibsInTwoProjects)
+
+    set(RunCMake_TEST_NO_CLEAN 1)
+
+    run_cmake_command(XcodeObjectLibsInTwoProjects-build-ios ${CMAKE_COMMAND} --build . --target shared_lib -- -sdk iphonesimulator)
+  endfunction()
+
+  XcodeObjectLibsInTwoProjectsiOS()
+
+  function(XcodeObjectLibsInTwoProjectsMacOS)
+    set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeObjectLibsInTwoProjects-build-macos)
+
+    run_cmake(XcodeObjectLibsInTwoProjects)
+
+    set(RunCMake_TEST_NO_CLEAN 1)
+
+    run_cmake_command(XcodeObjectLibsInTwoProjects-build-macos ${CMAKE_COMMAND} --build . --target shared_lib)
+  endfunction()
+
+  XcodeObjectLibsInTwoProjectsMacOS()
+
+endif()
+
 function(XcodeSchemaGeneration)
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/XcodeSchemaGeneration-build)
   set(RunCMake_TEST_NO_CLEAN 1)

Tests/RunCMake/XcodeProject/XcodeObjectLibsInTwoProjects.cmake

@@ -0,0 +1,5 @@
+cmake_minimum_required (VERSION 3.19)
+
+project (test_xcode_fail NONE)
+
+add_subdirectory(subproject_two_object_libs)

Tests/RunCMake/XcodeProject/subproject_two_object_libs/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required (VERSION 3.16)
+
+enable_language(CXX)
+
+project (subproject_two_object_libs)
+
+set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED NO)
+set(CMAKE_XCODE_ATTRIBUTE_CODE_SIGN_IDENTITY "")
+
+if(IOS)
+  set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+
+  set(CMAKE_OSX_ARCHITECTURES "arm64;x86_64")
+endif()
+
+# Hierarchy of libraries looks like:
+#
+# OBJECT-1 ---> STATIC--\
+#                        |---> SHARED
+# OBJECT-2 -------------/
+
+add_library(object_lib_dependency1 OBJECT dummy.cpp)
+
+add_library(static_lib_dependency STATIC dummy.cpp $<TARGET_OBJECTS:object_lib_dependency1>)
+
+add_library(object_lib_dependency2 OBJECT dummy.cpp)
+target_link_libraries(object_lib_dependency2 PRIVATE static_lib_dependency)
+
+add_library(shared_lib SHARED dummy.cpp)
+target_link_libraries(shared_lib PRIVATE static_lib_dependency)
+target_sources(shared_lib PRIVATE $<TARGET_OBJECTS:object_lib_dependency2>)

Tests/RunCMake/XcodeProject/subproject_two_object_libs/dummy.cpp

@@ -0,0 +1,5 @@
+namespace {
+void foo()
+{
+}
+}