Tests: Add FileAPI case for cross-directory target_* commands

The backtraces for some of the commands incorrectly come from the
target's directory instead of the caller's directory.  Expect the
incorrect backtraces in test results for now.

Increase the minimum required version of CMake in the test case
to enable policy CMP0079 to support cross-directory calls.

Issue: #23873

22 files changed, 247 insertions, 33 deletions

diff --git a/Tests/RunCMake/FileAPI/CMakeLists.txt b/Tests/RunCMake/FileAPI/CMakeLists.txt
index 44025d3..9a66cde 100644
--- a/Tests/RunCMake/FileAPI/CMakeLists.txt
+++ b/Tests/RunCMake/FileAPI/CMakeLists.txt
@@ -1,3 +1,3 @@
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.13)
 project(${RunCMake_TEST} NONE)
 include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-check.py b/Tests/RunCMake/FileAPI/codemodel-v2-check.py
index 01a004c..b7623de 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-check.py
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-check.py
@@ -664,6 +664,7 @@ def gen_check_directories(c, g):
         read_codemodel_json_data("directories/dir_dir.json"),
         read_codemodel_json_data("directories/external.json"),
         read_codemodel_json_data("directories/fileset.json"),
+        read_codemodel_json_data("directories/subdir.json"),
     ]
 
     if matches(g["name"], "^Visual Studio "):
@@ -722,6 +723,7 @@ def gen_check_targets(c, g, inSource):
         read_codemodel_json_data("targets/c_shared_exe.json"),
         read_codemodel_json_data("targets/c_static_lib.json"),
         read_codemodel_json_data("targets/c_static_exe.json"),
+        read_codemodel_json_data("targets/c_subdir.json"),
 
         read_codemodel_json_data("targets/all_build_cxx.json"),
         read_codemodel_json_data("targets/zero_check_cxx.json"),
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/alias.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/alias.json
index 6514910..de8b177 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/alias.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/alias.json
@@ -10,7 +10,7 @@
         "^cxx_alias_exe::@53632cba2752272bb008$"
     ],
     "projectName": "Alias",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": null,
     "installers": []
 }
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/custom.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/custom.json
index c89e4f9..e57191c 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/custom.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/custom.json
@@ -10,7 +10,7 @@
         "^custom_tgt::@c11385ffed57b860da63$"
     ],
     "projectName": "Custom",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": null,
     "installers": []
 }
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/cxx.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/cxx.json
index 8052c1a..28f2b99 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/cxx.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/cxx.json
@@ -16,7 +16,7 @@
         "^cxx_static_lib::@a56b12a3f5c0529fb296$"
     ],
     "projectName": "Cxx",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": true,
     "installers": [
         {
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir.json
index 8509f08..2a3756e 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir.json
@@ -7,7 +7,7 @@
     ],
     "targetIds": null,
     "projectName": "codemodel-v2",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": null,
     "installers": []
 }
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir_dir.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir_dir.json
index 27184cd..12677f2 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir_dir.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/dir_dir.json
@@ -5,7 +5,7 @@
     "childSources": null,
     "targetIds": null,
     "projectName": "codemodel-v2",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": null,
     "installers": []
 }
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/external.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/external.json
index 6d2952d..f1199c3 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/external.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/external.json
@@ -9,7 +9,7 @@
         "^generated_exe::@[0-9a-f]+$"
     ],
     "projectName": "External",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": true,
     "installers": [
         {
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/fileset.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/fileset.json
index 4774a13..c4df2ec 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/fileset.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/fileset.json
@@ -8,7 +8,7 @@
     "^c_headers_2::@6b8db101d64c125f29fe$"
   ],
   "projectName": "codemodel-v2",
-  "minimumCMakeVersion": "3.12",
+  "minimumCMakeVersion": "3.13",
   "hasInstallRule": true,
   "installers": [
     {
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/imported.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/imported.json
index 92b9526..8210d7f 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/imported.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/imported.json
@@ -13,7 +13,7 @@
         "^link_imported_static_exe::@ba7eb709d0b48779c6c8$"
     ],
     "projectName": "Imported",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": true,
     "installers": [
         {
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/interface.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/interface.json
index 90664dc..08edd64 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/interface.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/interface.json
@@ -9,7 +9,7 @@
         "^iface_srcs::@25b7fa8ea00134654b85$"
     ],
     "projectName": "Interface",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": null,
     "installers": []
 }
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/subdir.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/subdir.json
new file mode 100644
index 0000000..996da47
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/subdir.json
@@ -0,0 +1,11 @@
+{
+    "source": "^subdir$",
+    "build": "^subdir$",
+    "parentSource": "^\\.$",
+    "childSources": null,
+    "targetIds": null,
+    "projectName": "codemodel-v2",
+    "minimumCMakeVersion": "3.13",
+    "hasInstallRule": null,
+    "installers": []
+}
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/top.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/top.json
index e7b146f..aed07e2 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/top.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/directories/top.json
@@ -11,7 +11,8 @@
         "^object$",
         "^.*/Tests/RunCMake/FileAPIExternalSource$",
         "^dir$",
-        "^fileset$"
+        "^fileset$",
+        "^subdir$"
     ],
     "targetIds": [
         "^ALL_BUILD::@6890427a1f51a3e7e1df$",
@@ -22,10 +23,11 @@
         "^c_shared_lib::@6890427a1f51a3e7e1df$",
         "^c_static_exe::@6890427a1f51a3e7e1df$",
         "^c_static_lib::@6890427a1f51a3e7e1df$",
+        "^c_subdir::@6890427a1f51a3e7e1df$",
         "^interface_exe::@6890427a1f51a3e7e1df$"
     ],
     "projectName": "codemodel-v2",
-    "minimumCMakeVersion": "3.12",
+    "minimumCMakeVersion": "3.13",
     "hasInstallRule": true,
     "installers": [
         {
@@ -48,7 +50,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 39,
+                    "line": 42,
                     "command": "install",
                     "hasParent": true
                 },
@@ -93,7 +95,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 42,
+                    "line": 45,
                     "command": "install",
                     "hasParent": true
                 },
@@ -141,7 +143,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 42,
+                    "line": 45,
                     "command": "install",
                     "hasParent": true
                 },
@@ -186,7 +188,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 42,
+                    "line": 45,
                     "command": "install",
                     "hasParent": true
                 },
@@ -230,7 +232,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 42,
+                    "line": 45,
                     "command": "install",
                     "hasParent": true
                 },
@@ -274,7 +276,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 47,
+                    "line": 50,
                     "command": "install",
                     "hasParent": true
                 },
@@ -321,7 +323,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 49,
+                    "line": 52,
                     "command": "install",
                     "hasParent": true
                 },
@@ -366,7 +368,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 50,
+                    "line": 53,
                     "command": "install",
                     "hasParent": true
                 },
@@ -415,7 +417,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 51,
+                    "line": 54,
                     "command": "install",
                     "hasParent": true
                 },
@@ -467,7 +469,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 52,
+                    "line": 55,
                     "command": "install",
                     "hasParent": true
                 },
@@ -516,7 +518,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 53,
+                    "line": 56,
                     "command": "install",
                     "hasParent": true
                 },
@@ -558,7 +560,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 54,
+                    "line": 57,
                     "command": "install",
                     "hasParent": true
                 },
@@ -600,7 +602,7 @@
             "backtrace": [
                 {
                     "file": "^codemodel-v2\\.cmake$",
-                    "line": 55,
+                    "line": 58,
                     "command": "install",
                     "hasParent": true
                 },
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/projects/codemodel-v2.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/projects/codemodel-v2.json
index 0d6c4a1..151c0a8 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/projects/codemodel-v2.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/projects/codemodel-v2.json
@@ -14,7 +14,8 @@
         "^\\.$",
         "^dir$",
         "^dir/dir$",
-        "^fileset$"
+        "^fileset$",
+        "^subdir$"
     ],
     "targetIds": [
         "^ALL_BUILD::@6890427a1f51a3e7e1df$",
@@ -26,6 +27,7 @@
         "^c_shared_exe::@6890427a1f51a3e7e1df$",
         "^c_static_lib::@6890427a1f51a3e7e1df$",
         "^c_static_exe::@6890427a1f51a3e7e1df$",
+        "^c_subdir::@6890427a1f51a3e7e1df$",
         "^c_headers_1::@6b8db101d64c125f29fe$",
         "^c_headers_2::@6b8db101d64c125f29fe$"
     ]
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/all_build_top.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/all_build_top.json
index 4e772a7..0d45d07 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/all_build_top.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/all_build_top.json
@@ -96,6 +96,10 @@
             "backtrace": null
         },
         {
+            "id": "^c_subdir::@6890427a1f51a3e7e1df$",
+            "backtrace": null
+        },
+        {
             "id": "^c_static_exe::@6890427a1f51a3e7e1df$",
             "backtrace": null
         },
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_shared_lib.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_shared_lib.json
index b4318dd..9a210ff 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_shared_lib.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_shared_lib.json
@@ -115,7 +115,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 42,
+                        "line": 45,
                         "command": "install",
                         "hasParent": true
                     },
@@ -145,7 +145,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 42,
+                        "line": 45,
                         "command": "install",
                         "hasParent": true
                     },
@@ -175,7 +175,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 47,
+                        "line": 50,
                         "command": "install",
                         "hasParent": true
                     },
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_subdir.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_subdir.json
new file mode 100644
index 0000000..799c21e
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/c_subdir.json
@@ -0,0 +1,186 @@
+{
+    "name": "c_subdir",
+    "id": "^c_subdir::@6890427a1f51a3e7e1df$",
+    "directorySource": "^\\.$",
+    "projectName": "codemodel-v2",
+    "type": "STATIC_LIBRARY",
+    "isGeneratorProvided": null,
+    "sources": [
+        {
+            "path": "^subdir/empty\\.c$",
+            "isGenerated": null,
+            "sourceGroupName": "Source Files",
+            "compileGroupLanguage": "C",
+            "backtrace": [
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 18,
+                    "command": "add_subdirectory",
+                    "hasParent": true
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": null,
+                    "command": null,
+                    "hasParent": true
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": true
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": null,
+                    "command": null,
+                    "hasParent": false
+                }
+            ]
+        }
+    ],
+    "sourceGroups": [
+        {
+            "name": "Source Files",
+            "sourcePaths": [
+                "^subdir/empty\\.c$"
+            ]
+        }
+    ],
+    "compileGroups": [
+        {
+            "language": "C",
+            "sourcePaths": [
+                "^subdir/empty\\.c$"
+            ],
+            "includes": [
+              {
+                "path": "^.*/Tests/RunCMake/FileAPI/subdir$",
+                "isSystem": null,
+                "backtrace": [
+                  {
+                    "file": "^subdir/CMakeLists\\.txt$",
+                    "line": 2,
+                    "command": "target_include_directories",
+                    "hasParent": true
+                  },
+                  {
+                    "file": "^subdir/CMakeLists\\.txt$",
+                    "line": null,
+                    "command": null,
+                    "hasParent": false
+                  }
+                ]
+              }
+            ],
+            "defines": [
+                {
+                    "define": "SUBDIR",
+                    "backtrace": [
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": 18,
+                            "command": "add_subdirectory",
+                            "hasParent": true
+                        },
+                        {
+                            "file": "^codemodel-v2\\.cmake$",
+                            "line": null,
+                            "command": null,
+                            "hasParent": true
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": 3,
+                            "command": "include",
+                            "hasParent": true
+                        },
+                        {
+                            "file": "^CMakeLists\\.txt$",
+                            "line": null,
+                            "command": null,
+                            "hasParent": false
+                        }
+                    ]
+                }
+            ],
+            "compileCommandFragments": null
+        }
+    ],
+    "backtrace": [
+        {
+            "file": "^codemodel-v2\\.cmake$",
+            "line": 17,
+            "command": "add_library",
+            "hasParent": true
+        },
+        {
+            "file": "^codemodel-v2\\.cmake$",
+            "line": null,
+            "command": null,
+            "hasParent": true
+        },
+        {
+            "file": "^CMakeLists\\.txt$",
+            "line": 3,
+            "command": "include",
+            "hasParent": true
+        },
+        {
+            "file": "^CMakeLists\\.txt$",
+            "line": null,
+            "command": null,
+            "hasParent": false
+        }
+    ],
+    "folder": null,
+    "nameOnDisk": "^(lib)?c_subdir\\.(a|lib)$",
+    "artifacts": [
+        {
+            "path": "^((Debug|Release|RelWithDebInfo|MinSizeRel)/)?(lib)?c_subdir\\.(a|lib)$",
+            "_dllExtra": false
+        }
+    ],
+    "build": "^\\.$",
+    "source": "^\\.$",
+    "install": null,
+    "link": null,
+    "archive": {
+        "lto": null
+    },
+    "dependencies": [
+        {
+            "id": "^c_lib::@6890427a1f51a3e7e1df$",
+            "backtrace": [
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": 18,
+                    "command": "add_subdirectory",
+                    "hasParent": true
+                },
+                {
+                    "file": "^codemodel-v2\\.cmake$",
+                    "line": null,
+                    "command": null,
+                    "hasParent": true
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": 3,
+                    "command": "include",
+                    "hasParent": true
+                },
+                {
+                    "file": "^CMakeLists\\.txt$",
+                    "line": null,
+                    "command": null,
+                    "hasParent": false
+                }
+            ]
+        },
+        {
+            "id": "^ZERO_CHECK::@6890427a1f51a3e7e1df$",
+            "backtrace": null
+        }
+    ]
+}
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_exe.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_exe.json
index 5769f0c..16d074a 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_exe.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_exe.json
@@ -136,7 +136,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 39,
+                        "line": 42,
                         "command": "install",
                         "hasParent": true
                     },
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_shared_lib.json b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_shared_lib.json
index 1fe4d67..03f4cb9 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_shared_lib.json
+++ b/Tests/RunCMake/FileAPI/codemodel-v2-data/targets/cxx_shared_lib.json
@@ -91,7 +91,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 42,
+                        "line": 45,
                         "command": "install",
                         "hasParent": true
                     },
@@ -121,7 +121,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 42,
+                        "line": 45,
                         "command": "install",
                         "hasParent": true
                     },
@@ -151,7 +151,7 @@
                 "backtrace": [
                     {
                         "file": "^codemodel-v2\\.cmake$",
-                        "line": 47,
+                        "line": 50,
                         "command": "install",
                         "hasParent": true
                     },
diff --git a/Tests/RunCMake/FileAPI/codemodel-v2.cmake b/Tests/RunCMake/FileAPI/codemodel-v2.cmake
index 019eb87..09db216 100644
--- a/Tests/RunCMake/FileAPI/codemodel-v2.cmake
+++ b/Tests/RunCMake/FileAPI/codemodel-v2.cmake
@@ -14,6 +14,9 @@ add_library(c_static_lib STATIC empty.c)
 add_executable(c_static_exe empty.c)
 target_link_libraries(c_static_exe PRIVATE c_static_lib)
 
+add_library(c_subdir STATIC)
+add_subdirectory(subdir)
+
 add_subdirectory(cxx)
 add_subdirectory(alias)
 add_subdirectory(object)
diff --git a/Tests/RunCMake/FileAPI/subdir/CMakeLists.txt b/Tests/RunCMake/FileAPI/subdir/CMakeLists.txt
new file mode 100644
index 0000000..b8f4550
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/subdir/CMakeLists.txt
@@ -0,0 +1,4 @@
+target_compile_definitions(c_subdir PRIVATE SUBDIR)
+target_include_directories(c_subdir PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(c_subdir PRIVATE c_lib)
+target_sources(c_subdir PRIVATE empty.c)
diff --git a/Tests/RunCMake/FileAPI/subdir/empty.c b/Tests/RunCMake/FileAPI/subdir/empty.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Tests/RunCMake/FileAPI/subdir/empty.c