CMP0022: Add test for target_link_libraries plain signature

Tests/CMakeCommands/target_link_libraries/cmp0022/CMakeLists.txt

@@ -28,3 +28,10 @@ endif()
 
 add_executable(staticlib_exe staticlib_exe.cpp)
 target_link_libraries(staticlib_exe staticlib1)
+
+add_library(onlyplainlib1 SHARED onlyplainlib1.cpp)
+add_library(onlyplainlib2 SHARED onlyplainlib2.cpp)
+target_link_libraries(onlyplainlib2 onlyplainlib1)
+
+add_executable(onlyplainlib_user onlyplainlib_user.cpp)
+target_link_libraries(onlyplainlib_user onlyplainlib2)

Tests/CMakeCommands/target_link_libraries/cmp0022/onlyplainlib1.cpp

+
+#include "onlyplainlib1.h"
+
+OnlyPlainLib1::OnlyPlainLib1()
+  : result(0)
+{
+
+}
+
+int OnlyPlainLib1::GetResult()
+{
+  return result;
+}

Tests/CMakeCommands/target_link_libraries/cmp0022/onlyplainlib1.h

+
+struct
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+OnlyPlainLib1
+{
+  OnlyPlainLib1();
+
+  int GetResult();
+
+private:
+  int result;
+};

Tests/CMakeCommands/target_link_libraries/cmp0022/onlyplainlib2.cpp

+
+#include "onlyplainlib2.h"
+
+OnlyPlainLib1 onlyPlainLib2()
+{
+  OnlyPlainLib1 opl1;
+  return opl1;
+}

Tests/CMakeCommands/target_link_libraries/cmp0022/onlyplainlib2.h

+
+#include "onlyplainlib1.h"
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+OnlyPlainLib1 onlyPlainLib2();

Tests/CMakeCommands/target_link_libraries/cmp0022/onlyplainlib_user.cpp

+
+#include "onlyplainlib2.h"
+
+int main(int argc, char **argv)
+{
+  return onlyPlainLib2().GetResult();
+}