AutoGen: Account for CMP0116 in the depfile

Fixes: #21467

5 files changed, 40 insertions, 7 deletions

diff --git a/Source/cmQtAutoGenInitializer.cxx b/Source/cmQtAutoGenInitializer.cxx
index f27b788..67834f1 100644
--- a/Source/cmQtAutoGenInitializer.cxx
+++ b/Source/cmQtAutoGenInitializer.cxx
@@ -29,6 +29,7 @@
 #include "cmGeneratorExpression.h"
 #include "cmGeneratorTarget.h"
 #include "cmGlobalGenerator.h"
+#include "cmGlobalNinjaGenerator.h"
 #include "cmLinkItem.h"
 #include "cmListFileCache.h"
 #include "cmLocalGenerator.h"
@@ -1237,11 +1238,23 @@ bool cmQtAutoGenInitializer::InitAutogenTarget()
       const std::string outputFile =
         cmStrCat(this->Dir.Build, "/", timestampFileName);
       this->AutogenTarget.DepFile = cmStrCat(this->Dir.Build, "/deps");
-      auto relativeBinaryDir = cmSystemTools::RelativePath(
-        this->LocalGen->GetBinaryDirectory(),
-        this->LocalGen->GetCurrentBinaryDirectory());
-      if (!relativeBinaryDir.empty()) {
-        relativeBinaryDir = cmStrCat(relativeBinaryDir, "/");
+      std::string relativeBinaryDir;
+      if (dynamic_cast<cmGlobalNinjaGenerator*>(this->GlobalGen)) {
+        switch (this->LocalGen->GetPolicyStatus(cmPolicies::CMP0116)) {
+          case cmPolicies::OLD:
+          case cmPolicies::WARN:
+            relativeBinaryDir = cmSystemTools::RelativePath(
+              this->LocalGen->GetBinaryDirectory(),
+              this->LocalGen->GetCurrentBinaryDirectory());
+            if (!relativeBinaryDir.empty()) {
+              relativeBinaryDir = cmStrCat(relativeBinaryDir, "/");
+            }
+            break;
+          case cmPolicies::REQUIRED_IF_USED:
+          case cmPolicies::REQUIRED_ALWAYS:
+          case cmPolicies::NEW:
+            break;
+        }
       }
       this->AutogenTarget.DepFileRuleName =
         cmStrCat(relativeBinaryDir, this->GenTarget->GetName(), "_autogen/",
diff --git a/Tests/RunCMake/Ninja/Qt5AutoMocDeps.cmake b/Tests/RunCMake/Ninja/Qt5AutoMocDeps.cmake
index d69a119..d314ff3 100644
--- a/Tests/RunCMake/Ninja/Qt5AutoMocDeps.cmake
+++ b/Tests/RunCMake/Ninja/Qt5AutoMocDeps.cmake
@@ -7,3 +7,6 @@ set(CMAKE_AUTOMOC ON)
 add_library(simple_lib SHARED simple_lib.cpp)
 add_executable(app_with_qt app.cpp app_qt.cpp)
 target_link_libraries(app_with_qt PRIVATE simple_lib Qt5::Core)
+
+add_subdirectory(QtSubDir1)
+add_subdirectory(QtSubDir2)
diff --git a/Tests/RunCMake/Ninja/QtSubDir1/CMakeLists.txt b/Tests/RunCMake/Ninja/QtSubDir1/CMakeLists.txt
new file mode 100644
index 0000000..64016b6
--- /dev/null
+++ b/Tests/RunCMake/Ninja/QtSubDir1/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_policy(SET CMP0116 OLD)
+
+add_executable(sub_exe_1 ../app.cpp)
+target_link_libraries(sub_exe_1 PRIVATE Qt5::Core)
diff --git a/Tests/RunCMake/Ninja/QtSubDir2/CMakeLists.txt b/Tests/RunCMake/Ninja/QtSubDir2/CMakeLists.txt
new file mode 100644
index 0000000..3176426
--- /dev/null
+++ b/Tests/RunCMake/Ninja/QtSubDir2/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_policy(SET CMP0116 NEW)
+
+add_executable(sub_exe_2 ../app.cpp)
+target_link_libraries(sub_exe_2 PRIVATE Qt5::Core)
diff --git a/Tests/RunCMake/Ninja/RunCMakeTest.cmake b/Tests/RunCMake/Ninja/RunCMakeTest.cmake
index e6f86a1..b91ab00 100644
--- a/Tests/RunCMake/Ninja/RunCMakeTest.cmake
+++ b/Tests/RunCMake/Ninja/RunCMakeTest.cmake
@@ -338,8 +338,17 @@ function(run_Qt5AutoMocDeps)
     # Build and assert that AUTOMOC was not run for app_with_qt.
     run_ninja("${RunCMake_TEST_BINARY_DIR}")
     if(ninja_stdout MATCHES "Automatic MOC for target app_with_qt")
-        message(FATAL_ERROR
-               "AUTOMOC should not have executed for 'app_with_qt' target:\nstdout:\n${ninja_stdout}")
+      message(FATAL_ERROR
+        "AUTOMOC should not have executed for 'app_with_qt' target:\nstdout:\n${ninja_stdout}")
+    endif()
+    # Assert that the subdir executables were not rebuilt.
+    if(ninja_stdout MATCHES "Automatic MOC for target sub_exe_1")
+      message(FATAL_ERROR
+        "AUTOMOC should not have executed for 'sub_exe_1' target:\nstdout:\n${ninja_stdout}")
+    endif()
+    if(ninja_stdout MATCHES "Automatic MOC for target sub_exe_2")
+      message(FATAL_ERROR
+        "AUTOMOC should not have executed for 'sub_exe_2' target:\nstdout:\n${ninja_stdout}")
     endif()
   endif()
 endfunction()