Merge topic 'link-interface-direct'

f3ad061858 Add usage requirements to update direct link dependencies
193a999cd5 cmTarget: Add INTERFACE_LINK_LIBRARIES_DIRECT{,_EXCLUDE} backtrace storage
22d5427aa6 cmGeneratorTarget: Add LookupLinkItem option to consider own target name
f3d2eab36a cmGeneratorTarget: Fix link interface caching of partial results
d75ab9d066 cmGeneratorTarget: Clarify CMP0022 logic in ComputeLinkInterfaceLibraries
f3e9e03fe0 cmGeneratorTarget: Simplify CMP0022 warning check
216aa14997 cmGeneratorTarget: Return early from ExpandLinkItems with no items
1bc98371d1 Tests: Remove unnecessary policy setting from ObjectLibrary test
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6886

63 files changed, 773 insertions, 3 deletions

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index b1f473b..da6219e 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -3691,6 +3691,8 @@ if(BUILD_TESTING)
     --test-command InterfaceLinkLibraries)
   list(APPEND TEST_BUILD_DIRS "${CMake_BINARY_DIR}/Tests/InterfaceLinkLibraries")
 
+  ADD_TEST_MACRO(InterfaceLinkLibrariesDirect)
+
   if(NOT CMake_TEST_EXTERNAL_CMAKE)
     add_subdirectory(CMakeTests)
   endif()
diff --git a/Tests/ExportImport/Export/CMakeLists.txt b/Tests/ExportImport/Export/CMakeLists.txt
index a79efd0..c9e41f5 100644
--- a/Tests/ExportImport/Export/CMakeLists.txt
+++ b/Tests/ExportImport/Export/CMakeLists.txt
@@ -163,6 +163,16 @@ install(
 
 cmake_policy(PUSH)
 cmake_policy(SET CMP0022 NEW)
+
+# Test control over direct linking.
+include(../../InterfaceLinkLibrariesDirect/testStaticLibPlugin.cmake)
+include(../../InterfaceLinkLibrariesDirect/testSharedLibWithHelper.cmake)
+include(../../InterfaceLinkLibrariesDirect/testExeWithPluginHelper.cmake)
+if(NOT maybe_OBJECTS_DESTINATION)
+  target_compile_definitions(testSharedLibHelperObj INTERFACE testSharedLibHelperObj_NO_OBJECT)
+  target_compile_definitions(testExePluginHelperObj INTERFACE testExePluginHelperObj_NO_OBJECT)
+endif()
+
 # Test exporting dependent libraries into different exports
 add_library(testLibRequired testLibRequired.c)
 add_library(testLibDepends testLibDepends.c)
@@ -544,6 +554,9 @@ install(
   testLibDeprecation
   testLibCycleA testLibCycleB
   testLibNoSONAME
+  testStaticLibWithPlugin testStaticLibPluginExtra testStaticLibPlugin
+  testSharedLibWithHelper testSharedLibHelperObj
+  testExeWithPluginHelper testExePluginHelperObj
   testMod1 testMod2
   cmp0022NEW cmp0022OLD
   TopDirLib SubDirLinkA
@@ -619,6 +632,9 @@ export(TARGETS testExe2 testLib4 testLib5 testLib6 testLib7 testExe3 testExe4 te
   testLib4lib testLib4libdbg testLib4libopt
   testLibCycleA testLibCycleB
   testLibNoSONAME
+  testStaticLibWithPlugin testStaticLibPluginExtra testStaticLibPlugin
+  testSharedLibWithHelper testSharedLibHelperObj
+  testExeWithPluginHelper testExePluginHelperObj
   testMod1 testMod2
   testLibPerConfigDest
   NAMESPACE bld_
diff --git a/Tests/ExportImport/Import/A/CMakeLists.txt b/Tests/ExportImport/Import/A/CMakeLists.txt
index d6cc8d0..272c7a9 100644
--- a/Tests/ExportImport/Import/A/CMakeLists.txt
+++ b/Tests/ExportImport/Import/A/CMakeLists.txt
@@ -68,16 +68,23 @@ target_link_libraries(imp_testExe1
   exp_testLib7
   exp_testLibCycleA
   exp_testLibPerConfigDest
+  exp_testStaticLibWithPlugin
   )
 
 add_library(imp_testInterfaceInclude1 STATIC imp_testInterfaceInclude1.c)
 target_include_directories(imp_testInterfaceInclude1 SYSTEM PRIVATE testInterfaceIncludeSystem)
 target_link_libraries(imp_testInterfaceInclude1 PRIVATE exp_testInterfaceIncludeUser)
 
+add_executable(imp_UseSharedLibWithHelper1 ../../../InterfaceLinkLibrariesDirect/UseSharedLibWithHelper.c)
+target_link_libraries(imp_UseSharedLibWithHelper1 PRIVATE exp_testSharedLibWithHelper testSharedLibHelperExclude)
+
 # Try building a plugin to an executable imported from the install tree.
 add_library(imp_mod1 MODULE imp_mod1.c)
 target_link_libraries(imp_mod1 exp_testExe2)
 
+add_library(imp_ExePlugin1 MODULE ../../../InterfaceLinkLibrariesDirect/ExePlugin.c)
+target_link_libraries(imp_ExePlugin1 PRIVATE exp_testExeWithPluginHelper testExePluginHelperExclude)
+
 # Try referencing an executable imported from the build tree.
 add_custom_command(
   OUTPUT ${Import_BINARY_DIR}/bld_generated.c
@@ -112,6 +119,7 @@ target_link_libraries(imp_testExe1b
   bld_testLib7
   bld_testLibCycleA
   bld_testLibPerConfigDest
+  bld_testStaticLibWithPlugin
   )
 
 add_library(imp_testInterfaceInclude1b STATIC imp_testInterfaceInclude1.c)
@@ -183,10 +191,16 @@ target_link_libraries(SubDirLink_bld PRIVATE bld_TopDirLib bld_SubDirLinkA)
 add_executable(SubDirLink_exp SubDirLink.c)
 target_link_libraries(SubDirLink_exp PRIVATE exp_TopDirLib exp_SubDirLinkA)
 
+add_executable(imp_UseSharedLibWithHelper1b ../../../InterfaceLinkLibrariesDirect/UseSharedLibWithHelper.c)
+target_link_libraries(imp_UseSharedLibWithHelper1b PRIVATE bld_testSharedLibWithHelper testSharedLibHelperExclude)
+
 # Try building a plugin to an executable imported from the build tree.
 add_library(imp_mod1b MODULE imp_mod1.c)
 target_link_libraries(imp_mod1b bld_testExe2)
 
+add_library(imp_ExePlugin1b MODULE ../../../InterfaceLinkLibrariesDirect/ExePlugin.c)
+target_link_libraries(imp_ExePlugin1b PRIVATE bld_testExeWithPluginHelper testExePluginHelperExclude)
+
 # Export/CMakeLists.txt pretends the RelWithDebInfo (as well as Debug)
 # configuration should link to debug libs.
 foreach(c DEBUG RELWITHDEBINFO)
diff --git a/Tests/ExportImport/Import/A/imp_testExe1.c b/Tests/ExportImport/Import/A/imp_testExe1.c
index 8173557..7490a80 100644
--- a/Tests/ExportImport/Import/A/imp_testExe1.c
+++ b/Tests/ExportImport/Import/A/imp_testExe1.c
@@ -10,6 +10,7 @@ extern int testLib6(void);
 extern int testLib7(void);
 extern int testLibCycleA1(void);
 extern int testLibPerConfigDest(void);
+extern int testStaticLibPlugin(void);
 
 /* Switch a symbol between debug and optimized builds to make sure the
    proper library is found from the testLib4 link interface.  */
@@ -24,6 +25,7 @@ int main()
 {
   return (testLib2() + generated_by_testExe1() + testLib3() + testLib4() +
           testLib5() + testLib6() + testLib7() + testLibCycleA1() +
-          testLibPerConfigDest() + generated_by_testExe3() +
-          generated_by_testExe4() + testLib4lib() + testLib4libcfg());
+          testLibPerConfigDest() + testStaticLibPlugin() +
+          generated_by_testExe3() + generated_by_testExe4() + testLib4lib() +
+          testLib4libcfg());
 }
diff --git a/Tests/InterfaceLinkLibrariesDirect/CMakeLists.txt b/Tests/InterfaceLinkLibrariesDirect/CMakeLists.txt
new file mode 100644
index 0000000..b06a2fb
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/CMakeLists.txt
@@ -0,0 +1,156 @@
+cmake_minimum_required(VERSION 3.21)
+project(InterfaceLinkLibrariesDirect C)
+
+include(testStaticLibPlugin.cmake)
+add_executable(InterfaceLinkLibrariesDirect main.c)
+target_link_libraries(InterfaceLinkLibrariesDirect PRIVATE testStaticLibWithPlugin)
+
+include(testSharedLibWithHelper.cmake)
+add_executable(UseSharedLibWithHelper UseSharedLibWithHelper.c)
+target_link_libraries(UseSharedLibWithHelper PRIVATE testSharedLibWithHelper testSharedLibHelperExclude)
+
+include(testExeWithPluginHelper.cmake)
+add_library(ExePlugin MODULE ExePlugin.c)
+target_link_libraries(ExePlugin PRIVATE testExeWithPluginHelper testExePluginHelperExclude)
+
+#----------------------------------------------------------------------------
+
+# Offer usage requirements and symbols to be used through static libs below.
+add_library(A STATIC
+  a_always.c
+
+  # Good symbols that direct_from_A libraries poison if incorrectly used.
+  a_not_direct_from_A.c
+  a_not_direct_from_A_for_exe.c
+  a_not_direct_from_A_optional.c
+
+  # Bad symbols in direct_from_A libraries below to ensure they come first.
+  a_poison_direct_from_A.c
+  a_poison_direct_from_A_for_exe.c
+  a_poison_direct_from_A_optional.c
+  )
+
+# Propagates as usage requirement from A.
+add_library(direct_from_A STATIC direct_from_A.c direct_from_A_poison.c)
+target_compile_definitions(direct_from_A INTERFACE DEF_DIRECT_FROM_A)
+set_property(TARGET A APPEND PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT direct_from_A)
+
+# Propagates as usage requirement from A, but only for executables.
+add_library(direct_from_A_for_exe STATIC direct_from_A_for_exe.c direct_from_A_for_exe_poison.c)
+target_compile_definitions(direct_from_A_for_exe INTERFACE DEF_DIRECT_FROM_A_FOR_EXE)
+set_property(TARGET A APPEND PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT
+  "$<$<STREQUAL:$<TARGET_PROPERTY:TYPE>,EXECUTABLE>:direct_from_A_for_exe>")
+
+# Propagates as usage requirement from A, but only for targets that opt-in.
+add_library(direct_from_A_optional STATIC direct_from_A_optional.c direct_from_A_optional_poison.c)
+target_compile_definitions(direct_from_A_optional INTERFACE DEF_DIRECT_FROM_A_OPTIONAL)
+set_property(TARGET A APPEND PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT
+  "$<$<BOOL:$<TARGET_PROPERTY:A_LINK_OPTIONAL>>:direct_from_A_optional>")
+
+# Uses and propagates A's usage requirements.
+# Does not use the exe-only or optional usage requirements.
+add_library(static_A_public STATIC static_A_public.c)
+target_link_libraries(static_A_public PUBLIC A)
+
+# Uses A's usage requirements, but does not propagate them.
+# Does not use the exe-only usage requirement.  Does use the optional one.
+add_library(static_A_private STATIC static_A_private.c)
+target_link_libraries(static_A_private PRIVATE A)
+set_property(TARGET static_A_private PROPERTY A_LINK_OPTIONAL 1)
+
+# Uses A's usage requirements, including an optional one.
+add_executable(exe_use_static_A_public exe_use_static_A_public.c)
+target_link_libraries(exe_use_static_A_public PRIVATE static_A_public)
+set_property(TARGET exe_use_static_A_public PROPERTY A_LINK_OPTIONAL 1)
+
+# Does not use A's usage requirements.
+add_executable(exe_use_static_A_private exe_use_static_A_private.c)
+target_link_libraries(exe_use_static_A_private PRIVATE static_A_private)
+
+#----------------------------------------------------------------------------
+
+# Test how original and injected dependencies get ordered.
+
+# A bunch of static libraries that need to be linked in alphabetic order.
+# Each library has an extra source to poison all symbols meant to be
+# provided by earlier libraries.  This enforces ordering on platforms
+# whose linkers re-visit static libraries.
+add_library(order_A STATIC order_A.c)
+add_library(order_B STATIC order_B.c order_B_poison.c)
+add_library(order_C STATIC order_C.c order_C_poison.c)
+add_library(order_D STATIC order_D.c order_D_poison.c)
+add_library(order_E STATIC order_E.c order_E_poison.c)
+add_library(order_F STATIC order_F.c order_F_poison.c)
+add_library(order_G STATIC order_G.c order_G_poison.c)
+add_library(order_H STATIC order_H.c order_H_poison.c)
+add_library(order_I STATIC order_I.c order_I_poison.c)
+add_library(order_J STATIC order_J.c order_J_poison.c)
+
+# An executable to drive linking.
+add_executable(order_main order_main.c)
+
+# In the following diagram, connection by a slash means the top
+# target lists the bottom target in a link interface property:
+#
+#  \ => INTERFACE_LINK_LIBRARIES
+#  / => INTERFACE_LINK_LIBRARIES_DIRECT
+#
+# The top of each tree represents an entry in the exe's LINK_LIBRARIES.
+# CMake should evaluate this graph to generate the proper link order.
+#
+#             D        H
+#            / \      / \
+#           B   J    F   I
+#          /   /    /   / \
+#         A   C    E   G   J
+set_property(TARGET order_main PROPERTY LINK_LIBRARIES order_D order_H)
+set_property(TARGET order_D PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_B)
+set_property(TARGET order_D PROPERTY INTERFACE_LINK_LIBRARIES order_J)
+set_property(TARGET order_B PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_A)
+set_property(TARGET order_J PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_C)
+set_property(TARGET order_H PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_F)
+set_property(TARGET order_H PROPERTY INTERFACE_LINK_LIBRARIES order_I)
+set_property(TARGET order_F PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_E)
+set_property(TARGET order_I PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT order_G)
+set_property(TARGET order_I PROPERTY INTERFACE_LINK_LIBRARIES order_J)
+
+#----------------------------------------------------------------------------
+
+# Test that the original LINK_LIBRARIES cannot be re-ordered by injection
+# from usage requirements.
+
+# A bunch of static libraries that need to be linked in alphabetic order.
+# Each library has an extra source to poison all symbols meant to be
+# provided by earlier libraries.  This enforces ordering on platforms
+# whose linkers re-visit static libraries.
+add_library(force_A STATIC order_A.c)
+add_library(force_B STATIC order_B.c order_B_poison.c)
+add_library(force_C STATIC order_C.c order_C_poison.c)
+add_library(force_D STATIC order_D.c order_D_poison.c)
+add_library(force_E STATIC order_E.c order_E_poison.c)
+add_library(force_F STATIC order_F.c order_F_poison.c)
+add_library(force_G STATIC order_G.c order_G_poison.c)
+add_library(force_H STATIC order_H.c order_H_poison.c)
+add_library(force_I STATIC order_I.c order_I_poison.c)
+add_library(force_J STATIC order_J.c order_J_poison.c)
+
+# An executable to drive linking.
+add_executable(force_main order_main.c)
+
+# The executable explicitly lists all the libraries in the right order.
+target_link_libraries(force_main PRIVATE force_A force_B force_C force_D force_E force_F force_G force_H)
+
+# Add legitimate normal dependencies.
+set_property(TARGET force_D PROPERTY INTERFACE_LINK_LIBRARIES force_J)
+set_property(TARGET force_H PROPERTY INTERFACE_LINK_LIBRARIES force_I)
+set_property(TARGET force_I PROPERTY INTERFACE_LINK_LIBRARIES force_J)
+
+# Add bogus injected direct dependencies to verify that they do not
+# change the original order of LINK_LIBRARIES.
+set_property(TARGET force_A PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_B)
+set_property(TARGET force_B PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_C)
+set_property(TARGET force_C PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_D)
+set_property(TARGET force_D PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_E)
+set_property(TARGET force_E PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_F)
+set_property(TARGET force_F PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_G)
+set_property(TARGET force_G PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT force_H)
diff --git a/Tests/InterfaceLinkLibrariesDirect/ExePlugin.c b/Tests/InterfaceLinkLibrariesDirect/ExePlugin.c
new file mode 100644
index 0000000..40a261c
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/ExePlugin.c
@@ -0,0 +1,21 @@
+extern int testExePluginHelperObj(int n);
+
+#ifdef testExePluginHelperObj_NO_OBJECT
+int testExePluginHelperObj(int n)
+{
+  return n;
+}
+#endif
+
+#if defined(_WIN32)
+__declspec(dllimport)
+#endif
+  int testExePluginAPI(int n);
+
+#if defined(_WIN32)
+__declspec(dllexport)
+#endif
+  int testExePlugin(int n)
+{
+  return testExePluginAPI(n) + testExePluginHelperObj(n);
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/UseSharedLibWithHelper.c b/Tests/InterfaceLinkLibrariesDirect/UseSharedLibWithHelper.c
new file mode 100644
index 0000000..832e31f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/UseSharedLibWithHelper.c
@@ -0,0 +1,18 @@
+extern int testSharedLibHelperObj(int n);
+
+#ifdef testSharedLibHelperObj_NO_OBJECT
+int testSharedLibHelperObj(int n)
+{
+  return n;
+}
+#endif
+
+#if defined(_WIN32)
+__declspec(dllimport)
+#endif
+  int testSharedLibWithHelper(int n);
+
+int main(void)
+{
+  return testSharedLibWithHelper(0) + testSharedLibHelperObj(0);
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_always.c b/Tests/InterfaceLinkLibrariesDirect/a_always.c
new file mode 100644
index 0000000..007680d
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_always.c
@@ -0,0 +1,3 @@
+void a_always(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A.c b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A.c
new file mode 100644
index 0000000..732d36e
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A.c
@@ -0,0 +1,3 @@
+void not_direct_from_A(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_for_exe.c b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_for_exe.c
new file mode 100644
index 0000000..9aed296
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_for_exe.c
@@ -0,0 +1,3 @@
+void not_direct_from_A_for_exe(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_optional.c b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_optional.c
new file mode 100644
index 0000000..3572e51
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_not_direct_from_A_optional.c
@@ -0,0 +1,3 @@
+void not_direct_from_A_optional(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A.c b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A.c
new file mode 100644
index 0000000..6d1963d
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A.c
@@ -0,0 +1,5 @@
+extern void poison_direct_from_A(void);
+void direct_from_A(void)
+{
+  poison_direct_from_A();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_for_exe.c b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_for_exe.c
new file mode 100644
index 0000000..623fc07
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_for_exe.c
@@ -0,0 +1,5 @@
+extern void poison_direct_from_A_for_exe(void);
+void direct_from_A_for_exe(void)
+{
+  poison_direct_from_A_for_exe();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_optional.c b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_optional.c
new file mode 100644
index 0000000..0f1328e
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/a_poison_direct_from_A_optional.c
@@ -0,0 +1,5 @@
+extern void poison_direct_from_A_optional(void);
+void direct_from_A_optional(void)
+{
+  poison_direct_from_A_optional();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A.c
new file mode 100644
index 0000000..d6d0df3
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A.c
@@ -0,0 +1,3 @@
+void direct_from_A(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe.c
new file mode 100644
index 0000000..dfa6db1
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe.c
@@ -0,0 +1,3 @@
+void direct_from_A_for_exe(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe_poison.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe_poison.c
new file mode 100644
index 0000000..c0ecb0b
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_for_exe_poison.c
@@ -0,0 +1,5 @@
+extern void poison_not_direct_from_A_for_exe(void);
+void not_direct_from_A_for_exe(void)
+{
+  poison_not_direct_from_A_for_exe();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional.c
new file mode 100644
index 0000000..affdaeb
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional.c
@@ -0,0 +1,3 @@
+void direct_from_A_optional(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional_poison.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional_poison.c
new file mode 100644
index 0000000..c7c3528
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_optional_poison.c
@@ -0,0 +1,5 @@
+extern void poison_not_direct_from_A_optional(void);
+void not_direct_from_A_optional(void)
+{
+  poison_not_direct_from_A_optional();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/direct_from_A_poison.c b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_poison.c
new file mode 100644
index 0000000..b03cdf7
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/direct_from_A_poison.c
@@ -0,0 +1,5 @@
+extern void poison_not_direct_from_A(void);
+void not_direct_from_A(void)
+{
+  poison_not_direct_from_A();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_private.c b/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_private.c
new file mode 100644
index 0000000..024e96e
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_private.c
@@ -0,0 +1,23 @@
+#ifdef DEF_DIRECT_FROM_A
+#  error "DEF_DIRECT_FROM_A incorrectly defined"
+#endif
+#ifdef DEF_DIRECT_FROM_A_FOR_EXE
+#  error "DEF_DIRECT_FROM_A_FOR_EXE incorrectly defined"
+#endif
+#ifdef DEF_DIRECT_FROM_A_OPTIONAL
+#  error "DEF_DIRECT_FROM_A_OPTIONAL incorrectly defined"
+#endif
+
+extern void static_A_private(void);
+extern void not_direct_from_A(void);
+extern void not_direct_from_A_for_exe(void);
+extern void not_direct_from_A_optional(void);
+
+int main(void)
+{
+  static_A_private();
+  not_direct_from_A();
+  not_direct_from_A_for_exe();
+  not_direct_from_A_optional();
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_public.c b/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_public.c
new file mode 100644
index 0000000..b3b0a56
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/exe_use_static_A_public.c
@@ -0,0 +1,23 @@
+#ifndef DEF_DIRECT_FROM_A
+#  error "DEF_DIRECT_FROM_A incorrectly not defined"
+#endif
+#ifndef DEF_DIRECT_FROM_A_FOR_EXE
+#  error "DEF_DIRECT_FROM_A_FOR_EXE incorrectly not defined"
+#endif
+#ifndef DEF_DIRECT_FROM_A_OPTIONAL
+#  error "DEF_DIRECT_FROM_A_OPTIONAL incorrectly not defined"
+#endif
+
+extern void static_A_public(void);
+extern void direct_from_A(void);
+extern void direct_from_A_for_exe(void);
+extern void direct_from_A_optional(void);
+
+int main(void)
+{
+  static_A_public();
+  direct_from_A();
+  direct_from_A_for_exe();
+  direct_from_A_optional();
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/main.c b/Tests/InterfaceLinkLibrariesDirect/main.c
new file mode 100644
index 0000000..53f0e6d
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/main.c
@@ -0,0 +1,5 @@
+extern int testStaticLibPlugin(void);
+int main(void)
+{
+  return testStaticLibPlugin();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_A.c b/Tests/InterfaceLinkLibrariesDirect/order_A.c
new file mode 100644
index 0000000..2cd4d60
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_A.c
@@ -0,0 +1,5 @@
+extern void order_B(void);
+void order_A(void)
+{
+  order_B();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_B.c b/Tests/InterfaceLinkLibrariesDirect/order_B.c
new file mode 100644
index 0000000..1787f1d
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_B.c
@@ -0,0 +1,5 @@
+extern void order_C(void);
+void order_B(void)
+{
+  order_C();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_B_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_B_poison.c
new file mode 100644
index 0000000..bcb7b4b
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_B_poison.c
@@ -0,0 +1,6 @@
+extern void order_B_poison(void);
+
+void order_A(void)
+{
+  order_B_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_C.c b/Tests/InterfaceLinkLibrariesDirect/order_C.c
new file mode 100644
index 0000000..e67e719
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_C.c
@@ -0,0 +1,5 @@
+extern void order_D(void);
+void order_C(void)
+{
+  order_D();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_C_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_C_poison.c
new file mode 100644
index 0000000..fc31104
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_C_poison.c
@@ -0,0 +1,11 @@
+extern void order_C_poison(void);
+
+void order_A(void)
+{
+  order_C_poison();
+}
+
+void order_B(void)
+{
+  order_C_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_D.c b/Tests/InterfaceLinkLibrariesDirect/order_D.c
new file mode 100644
index 0000000..f5bb2d6
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_D.c
@@ -0,0 +1,5 @@
+extern void order_E(void);
+void order_D(void)
+{
+  order_E();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_D_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_D_poison.c
new file mode 100644
index 0000000..d2d64e6
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_D_poison.c
@@ -0,0 +1,16 @@
+extern void order_D_poison(void);
+
+void order_A(void)
+{
+  order_D_poison();
+}
+
+void order_B(void)
+{
+  order_D_poison();
+}
+
+void order_C(void)
+{
+  order_D_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_E.c b/Tests/InterfaceLinkLibrariesDirect/order_E.c
new file mode 100644
index 0000000..2a56443
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_E.c
@@ -0,0 +1,5 @@
+extern void order_F(void);
+void order_E(void)
+{
+  order_F();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_E_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_E_poison.c
new file mode 100644
index 0000000..7d8b53e
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_E_poison.c
@@ -0,0 +1,21 @@
+extern void order_E_poison(void);
+
+void order_A(void)
+{
+  order_E_poison();
+}
+
+void order_B(void)
+{
+  order_E_poison();
+}
+
+void order_C(void)
+{
+  order_E_poison();
+}
+
+void order_D(void)
+{
+  order_E_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_F.c b/Tests/InterfaceLinkLibrariesDirect/order_F.c
new file mode 100644
index 0000000..d242284
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_F.c
@@ -0,0 +1,5 @@
+extern void order_G(void);
+void order_F(void)
+{
+  order_G();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_F_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_F_poison.c
new file mode 100644
index 0000000..285f247
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_F_poison.c
@@ -0,0 +1,26 @@
+extern void order_F_poison(void);
+
+void order_A(void)
+{
+  order_F_poison();
+}
+
+void order_B(void)
+{
+  order_F_poison();
+}
+
+void order_C(void)
+{
+  order_F_poison();
+}
+
+void order_D(void)
+{
+  order_F_poison();
+}
+
+void order_E(void)
+{
+  order_F_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_G.c b/Tests/InterfaceLinkLibrariesDirect/order_G.c
new file mode 100644
index 0000000..ff71038
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_G.c
@@ -0,0 +1,5 @@
+extern void order_H(void);
+void order_G(void)
+{
+  order_H();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_G_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_G_poison.c
new file mode 100644
index 0000000..3a1fe1d
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_G_poison.c
@@ -0,0 +1,31 @@
+extern void order_G_poison(void);
+
+void order_A(void)
+{
+  order_G_poison();
+}
+
+void order_B(void)
+{
+  order_G_poison();
+}
+
+void order_C(void)
+{
+  order_G_poison();
+}
+
+void order_D(void)
+{
+  order_G_poison();
+}
+
+void order_E(void)
+{
+  order_G_poison();
+}
+
+void order_F(void)
+{
+  order_G_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_H.c b/Tests/InterfaceLinkLibrariesDirect/order_H.c
new file mode 100644
index 0000000..9c62bb1
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_H.c
@@ -0,0 +1,5 @@
+extern void order_I(void);
+void order_H(void)
+{
+  order_I();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_H_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_H_poison.c
new file mode 100644
index 0000000..0c6b84f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_H_poison.c
@@ -0,0 +1,36 @@
+extern void order_H_poison(void);
+
+void order_A(void)
+{
+  order_H_poison();
+}
+
+void order_B(void)
+{
+  order_H_poison();
+}
+
+void order_C(void)
+{
+  order_H_poison();
+}
+
+void order_D(void)
+{
+  order_H_poison();
+}
+
+void order_E(void)
+{
+  order_H_poison();
+}
+
+void order_F(void)
+{
+  order_H_poison();
+}
+
+void order_G(void)
+{
+  order_H_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_I.c b/Tests/InterfaceLinkLibrariesDirect/order_I.c
new file mode 100644
index 0000000..96152de
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_I.c
@@ -0,0 +1,5 @@
+extern void order_J(void);
+void order_I(void)
+{
+  order_J();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_I_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_I_poison.c
new file mode 100644
index 0000000..3fabe1f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_I_poison.c
@@ -0,0 +1,41 @@
+extern void order_I_poison(void);
+
+void order_A(void)
+{
+  order_I_poison();
+}
+
+void order_B(void)
+{
+  order_I_poison();
+}
+
+void order_C(void)
+{
+  order_I_poison();
+}
+
+void order_D(void)
+{
+  order_I_poison();
+}
+
+void order_E(void)
+{
+  order_I_poison();
+}
+
+void order_F(void)
+{
+  order_I_poison();
+}
+
+void order_G(void)
+{
+  order_I_poison();
+}
+
+void order_H(void)
+{
+  order_I_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_J.c b/Tests/InterfaceLinkLibrariesDirect/order_J.c
new file mode 100644
index 0000000..49eec47
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_J.c
@@ -0,0 +1,3 @@
+void order_J(void)
+{
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_J_poison.c b/Tests/InterfaceLinkLibrariesDirect/order_J_poison.c
new file mode 100644
index 0000000..9724fd5
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_J_poison.c
@@ -0,0 +1,46 @@
+extern void order_J_poison(void);
+
+void order_A(void)
+{
+  order_J_poison();
+}
+
+void order_B(void)
+{
+  order_J_poison();
+}
+
+void order_C(void)
+{
+  order_J_poison();
+}
+
+void order_D(void)
+{
+  order_J_poison();
+}
+
+void order_E(void)
+{
+  order_J_poison();
+}
+
+void order_F(void)
+{
+  order_J_poison();
+}
+
+void order_G(void)
+{
+  order_J_poison();
+}
+
+void order_H(void)
+{
+  order_J_poison();
+}
+
+void order_I(void)
+{
+  order_J_poison();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/order_main.c b/Tests/InterfaceLinkLibrariesDirect/order_main.c
new file mode 100644
index 0000000..eed2453
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/order_main.c
@@ -0,0 +1,6 @@
+extern void order_A(void);
+int main(void)
+{
+  order_A();
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/static_A_private.c b/Tests/InterfaceLinkLibrariesDirect/static_A_private.c
new file mode 100644
index 0000000..d98a22c
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/static_A_private.c
@@ -0,0 +1,16 @@
+#ifndef DEF_DIRECT_FROM_A
+#  error "DEF_DIRECT_FROM_A incorrectly not defined"
+#endif
+#ifdef DEF_DIRECT_FROM_A_FOR_EXE
+#  error "DEF_DIRECT_FROM_A_FOR_EXE incorrectly defined"
+#endif
+#ifndef DEF_DIRECT_FROM_A_OPTIONAL
+#  error "DEF_DIRECT_FROM_A_OPTIONAL incorrectly not defined"
+#endif
+
+extern void a_always(void);
+
+void static_A_private(void)
+{
+  a_always();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/static_A_public.c b/Tests/InterfaceLinkLibrariesDirect/static_A_public.c
new file mode 100644
index 0000000..ed88ca6
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/static_A_public.c
@@ -0,0 +1,16 @@
+#ifndef DEF_DIRECT_FROM_A
+#  error "DEF_DIRECT_FROM_A incorrectly not defined"
+#endif
+#ifdef DEF_DIRECT_FROM_A_FOR_EXE
+#  error "DEF_DIRECT_FROM_A_FOR_EXE incorrectly defined"
+#endif
+#ifdef DEF_DIRECT_FROM_A_OPTIONAL
+#  error "DEF_DIRECT_FROM_A_OPTIONAL incorrectly defined"
+#endif
+
+extern void a_always(void);
+
+void static_A_public(void)
+{
+  a_always();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testExePluginHelperObj.c b/Tests/InterfaceLinkLibrariesDirect/testExePluginHelperObj.c
new file mode 100644
index 0000000..49c495f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testExePluginHelperObj.c
@@ -0,0 +1,4 @@
+int testExePluginHelperObj(int n)
+{
+  return n;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.c b/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.c
new file mode 100644
index 0000000..f8787db
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.c
@@ -0,0 +1,12 @@
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+  int testExePluginAPI(int n)
+{
+  return n;
+}
+
+int main(void)
+{
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.cmake b/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.cmake
new file mode 100644
index 0000000..97c5b65
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testExeWithPluginHelper.cmake
@@ -0,0 +1,7 @@
+# Logic common to InterfaceLinkLibrariesDirect and ExportImport tests.
+set(src ${CMAKE_CURRENT_LIST_DIR})
+add_executable(testExeWithPluginHelper ${src}/testExeWithPluginHelper.c)
+add_library(testExePluginHelperObj OBJECT ${src}/testExePluginHelperObj.c)
+set_property(TARGET testExeWithPluginHelper PROPERTY ENABLE_EXPORTS 1)
+set_property(TARGET testExeWithPluginHelper PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT $<TARGET_NAME:testExePluginHelperObj>)
+set_property(TARGET testExeWithPluginHelper PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE $<1:testExePluginHelperExclude>)
diff --git a/Tests/InterfaceLinkLibrariesDirect/testSharedLibHelperObj.c b/Tests/InterfaceLinkLibrariesDirect/testSharedLibHelperObj.c
new file mode 100644
index 0000000..9d55fcb
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testSharedLibHelperObj.c
@@ -0,0 +1,4 @@
+int testSharedLibHelperObj(int n)
+{
+  return n;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.c b/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.c
new file mode 100644
index 0000000..f942b54
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.c
@@ -0,0 +1,7 @@
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+  int testSharedLibWithHelper(int n)
+{
+  return n;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.cmake b/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.cmake
new file mode 100644
index 0000000..c51751c
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testSharedLibWithHelper.cmake
@@ -0,0 +1,6 @@
+# Logic common to InterfaceLinkLibrariesDirect and ExportImport tests.
+set(src ${CMAKE_CURRENT_LIST_DIR})
+add_library(testSharedLibWithHelper SHARED ${src}/testSharedLibWithHelper.c)
+add_library(testSharedLibHelperObj OBJECT ${src}/testSharedLibHelperObj.c)
+set_property(TARGET testSharedLibWithHelper PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT $<TARGET_NAME:testSharedLibHelperObj>)
+set_property(TARGET testSharedLibWithHelper PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE $<1:testSharedLibHelperExclude>)
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.c
new file mode 100644
index 0000000..17f643f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.c
@@ -0,0 +1,6 @@
+extern int testStaticLibWithPlugin1(void);
+extern int testStaticLibPluginExtra(void);
+int testStaticLibPlugin(void)
+{
+  return testStaticLibWithPlugin1() + testStaticLibPluginExtra();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.cmake b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.cmake
new file mode 100644
index 0000000..907872f
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPlugin.cmake
@@ -0,0 +1,14 @@
+# Logic common to InterfaceLinkLibrariesDirect and ExportImport tests.
+set(src ${CMAKE_CURRENT_LIST_DIR})
+add_library(testStaticLibWithPlugin STATIC
+  ${src}/testStaticLibWithPlugin1.c    # used by testStaticLibPlugin
+  ${src}/testStaticLibWithPlugin2.c    # used by testStaticLibPluginExtra
+  ${src}/testStaticLibWithPluginBad1.c # link error if not after testStaticLibPlugin
+  ${src}/testStaticLibWithPluginBad2.c # link error if not after testStaticLibPluginExtra
+  )
+add_library(testStaticLibPluginExtra STATIC ${src}/testStaticLibPluginExtra.c)
+add_library(testStaticLibPlugin STATIC ${src}/testStaticLibPlugin.c)
+target_link_libraries(testStaticLibPlugin PUBLIC testStaticLibWithPlugin testStaticLibPluginExtra)
+target_link_libraries(testStaticLibPluginExtra PUBLIC testStaticLibWithPlugin)
+set_property(TARGET testStaticLibWithPlugin PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT testStaticLibPlugin)
+set_property(TARGET testStaticLibWithPlugin PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE testStaticLibWithPlugin)
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibPluginExtra.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPluginExtra.c
new file mode 100644
index 0000000..11fe0f8
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibPluginExtra.c
@@ -0,0 +1,5 @@
+extern int testStaticLibWithPlugin2(void);
+int testStaticLibPluginExtra(void)
+{
+  return testStaticLibWithPlugin2();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin1.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin1.c
new file mode 100644
index 0000000..5e75dce
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin1.c
@@ -0,0 +1,4 @@
+int testStaticLibWithPlugin1(void)
+{
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin2.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin2.c
new file mode 100644
index 0000000..74ac1ae
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPlugin2.c
@@ -0,0 +1,4 @@
+int testStaticLibWithPlugin2(void)
+{
+  return 0;
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad1.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad1.c
new file mode 100644
index 0000000..b41abc9
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad1.c
@@ -0,0 +1,6 @@
+/* Produce an error if if the object compiled from this source is used.  */
+extern int testStaticLibWithPlugin_linked_before_testStaticLibPlugin(void);
+int testStaticLibPlugin(void)
+{
+  return testStaticLibWithPlugin_linked_before_testStaticLibPlugin();
+}
diff --git a/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad2.c b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad2.c
new file mode 100644
index 0000000..43337a5
--- /dev/null
+++ b/Tests/InterfaceLinkLibrariesDirect/testStaticLibWithPluginBad2.c
@@ -0,0 +1,7 @@
+/* Produce an error if if the object compiled from this source is used.  */
+extern int testStaticLibWithPlugin_linked_before_testStaticLibPluginExtra(
+  void);
+int testStaticLibPluginExtra(void)
+{
+  return testStaticLibWithPlugin_linked_before_testStaticLibPluginExtra();
+}
diff --git a/Tests/ObjectLibrary/Transitive/BarMain.c b/Tests/ObjectLibrary/Transitive/BarMain.c
new file mode 100644
index 0000000..aec3e48
--- /dev/null
+++ b/Tests/ObjectLibrary/Transitive/BarMain.c
@@ -0,0 +1,6 @@
+extern int BarObject1(void);
+
+int main(void)
+{
+  return BarObject1();
+}
diff --git a/Tests/ObjectLibrary/Transitive/BarObject1.c b/Tests/ObjectLibrary/Transitive/BarObject1.c
new file mode 100644
index 0000000..2f68386
--- /dev/null
+++ b/Tests/ObjectLibrary/Transitive/BarObject1.c
@@ -0,0 +1,5 @@
+extern int BarObject2(void);
+int BarObject1(void)
+{
+  return BarObject2();
+}
diff --git a/Tests/ObjectLibrary/Transitive/BarObject2.c b/Tests/ObjectLibrary/Transitive/BarObject2.c
new file mode 100644
index 0000000..881c64a
--- /dev/null
+++ b/Tests/ObjectLibrary/Transitive/BarObject2.c
@@ -0,0 +1,5 @@
+extern int BarObject3(void);
+int BarObject2(void)
+{
+  return BarObject3();
+}
diff --git a/Tests/ObjectLibrary/Transitive/BarObject3.c b/Tests/ObjectLibrary/Transitive/BarObject3.c
new file mode 100644
index 0000000..e557dbc
--- /dev/null
+++ b/Tests/ObjectLibrary/Transitive/BarObject3.c
@@ -0,0 +1,4 @@
+int BarObject3(void)
+{
+  return 0;
+}
diff --git a/Tests/ObjectLibrary/Transitive/CMakeLists.txt b/Tests/ObjectLibrary/Transitive/CMakeLists.txt
index d616cda..17247eb 100644
--- a/Tests/ObjectLibrary/Transitive/CMakeLists.txt
+++ b/Tests/ObjectLibrary/Transitive/CMakeLists.txt
@@ -1,4 +1,3 @@
-cmake_policy(SET CMP0022 NEW)
 add_library(FooStatic STATIC FooStatic.c)
 
 add_library(FooObject1 OBJECT FooObject.c)
@@ -10,3 +9,17 @@ add_library(FooObject2 OBJECT FooObject.c)
 target_link_libraries(FooObject2 INTERFACE FooStatic)
 add_executable(Transitive2 Transitive.c)
 target_link_libraries(Transitive2 PRIVATE FooObject2)
+
+add_library(FooObjectDirect OBJECT FooObject.c)
+add_library(FooStaticDirect STATIC FooStatic.c)
+set_property(TARGET FooStaticDirect PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT FooObjectDirect)
+add_executable(TransitiveDirect Transitive.c)
+target_link_libraries(TransitiveDirect PRIVATE FooStaticDirect)
+
+add_library(BarObject1 OBJECT BarObject1.c)
+add_library(BarObject2 OBJECT BarObject2.c)
+add_library(BarObject3 OBJECT BarObject3.c)
+set_property(TARGET BarObject1 PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT BarObject2)
+set_property(TARGET BarObject2 PROPERTY INTERFACE_LINK_LIBRARIES_DIRECT BarObject3)
+add_executable(BarMain BarMain.c)
+target_link_libraries(BarMain PRIVATE BarObject1)