tests: add PYBIND11_TEST_SMART_HOLDER to tests

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
             cmake-args: -DCMAKE_CXX_STANDARD=23 -DPYBIND11_SIMPLE_GIL_MANAGEMENT=ON
           - runs-on: ubuntu-latest
             python-version: '3.14t'
-            cmake-args: -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_FLAGS="-DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE"
+            cmake-args: -DCMAKE_CXX_STANDARD=17 -DPYBIND11_TEST_SMART_HOLDER=ON
           - runs-on: ubuntu-latest
             python-version: 'pypy3.11'
             cmake-args: -DCMAKE_CXX_STANDARD=17
@@ -83,10 +83,10 @@ jobs:
             cmake-args: -DCMAKE_CXX_STANDARD=20
           - runs-on: ubuntu-latest
             python-version: '3.11'
-            cmake-args: -DCMAKE_CXX_FLAGS="-DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE" -DCMAKE_CXX_STANDARD=17
+            cmake-args: -DPYBIND11_TEST_SMART_HOLDER=ON -DCMAKE_CXX_STANDARD=17
           - runs-on: ubuntu-latest
             python-version: '3.12'
-            cmake-args: -DCMAKE_CXX_FLAGS="-DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE" -DPYBIND11_SIMPLE_GIL_MANAGEMENT=ON
+            cmake-args: -DPYBIND11_TEST_SMART_HOLDER=ON -DPYBIND11_SIMPLE_GIL_MANAGEMENT=ON
           - runs-on: ubuntu-latest
             python-version: '3.13t'
             cmake-args: -DCMAKE_CXX_STANDARD=20 -DPYBIND11_DISABLE_HANDLE_TYPE_NAME_DEFAULT_IMPLEMENTATION=ON
@@ -105,7 +105,7 @@ jobs:
             cmake-args: -DCMAKE_CXX_STANDARD=14
           - runs-on: macos-13
             python-version: '3.11'
-            cmake-args: -DCMAKE_CXX_FLAGS="-DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE"
+            cmake-args: -DPYBIND11_TEST_SMART_HOLDER=ON
           - runs-on: macos-latest
             python-version: '3.12'
             cmake-args: -DCMAKE_CXX_STANDARD=17 -DPYBIND11_DISABLE_HANDLE_TYPE_NAME_DEFAULT_IMPLEMENTATION=ON
@@ -125,7 +125,7 @@ jobs:
 
           - runs-on: windows-2019
             python-version: '3.9'
-            cmake-args:  -DCMAKE_CXX_FLAGS="-DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE"
+            cmake-args: -DPYBIND11_TEST_SMART_HOLDER=ON
           - runs-on: windows-2022
             python-version: '3.8'
             cmake-args: -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DPYBIND11_NUMPY_1_ONLY=ON
@@ -138,7 +138,7 @@ jobs:
           #   cmake-args: -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDebug
           - runs-on: windows-2022
             python-version: '3.10'
-            cmake-args: -DCMAKE_CXX_FLAGS="/DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE /GR /EHsc"
+            cmake-args: -DPYBIND11_TEST_SMART_HOLDER=ON -DCMAKE_CXX_FLAGS="/GR /EHsc"
           - runs-on: windows-2022
             python-version: '3.13'
             cmake-args: -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDebugDLL

tests/CMakeLists.txt

@@ -69,6 +69,7 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../tools")
 option(PYBIND11_WERROR "Report all warnings as errors" OFF)
 option(DOWNLOAD_EIGEN "Download EIGEN" OFF)
 option(PYBIND11_CUDA_TESTS "Enable building CUDA tests" OFF)
+option(PYBIND11_TEST_SMART_HOLDER "Change the default to smart holder" OFF)
 set(PYBIND11_TEST_OVERRIDE
     ""
     CACHE STRING "Tests from ;-separated list of *.cpp files will be built instead of all tests")
@@ -499,6 +500,13 @@ foreach(target ${test_targets})
     target_compile_definitions(${target} PRIVATE -DPYBIND11_TEST_BOOST)
   endif()
 
+  if(PYBIND11_TEST_SMART_HOLDER)
+    target_compile_definitions(
+      ${target}
+      PUBLIC -DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE
+    )
+  endif()
+
   target_link_libraries(${target} PRIVATE ${STD_FS_LIB})
 
   # Always write the output file directly into the 'tests' directory (even on MSVC)
@@ -572,6 +580,16 @@ if(NOT PYBIND11_CUDA_TESTS)
                                                            "$<1:${CMAKE_CURRENT_BINARY_DIR}>")
   set_target_properties(mod_shared_interpreter_gil PROPERTIES LIBRARY_OUTPUT_DIRECTORY
                                                               "$<1:${CMAKE_CURRENT_BINARY_DIR}>")
+  if(PYBIND11_TEST_SMART_HOLDER)
+    target_compile_definitions(
+      mod_per_interpreter_gil
+      PUBLIC -DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE
+    )
+    target_compile_definitions(
+      mod_shared_interpreter_gil
+      PUBLIC -DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE
+    )
+  endif()
   add_dependencies(pytest mod_per_interpreter_gil mod_shared_interpreter_gil)
 endif()
 

tests/test_cmake_build/CMakeLists.txt

@@ -51,6 +51,11 @@ function(pybind11_add_build_test name)
   add_dependencies(test_cmake_build test_build_${name})
 endfunction()
 
+if(PYBIND11_TEST_SMART_HOLDER)
+  add_compile_definitions(
+    -DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE)
+endif()
+
 possibly_uninitialized(PYTHON_MODULE_EXTENSION Python_INTERPRETER_ID)
 
 pybind11_add_build_test(subdirectory_function)

tests/test_embed/CMakeLists.txt

@@ -28,6 +28,11 @@ endif()
 
 find_package(Threads REQUIRED)
 
+if(PYBIND11_TEST_SMART_HOLDER)
+  add_compile_definitions(
+    -DPYBIND11_RUN_TESTING_WITH_SMART_HOLDER_AS_DEFAULT_BUT_NEVER_USE_IN_PRODUCTION_PLEASE)
+endif()
+
 add_executable(test_embed catch.cpp test_interpreter.cpp test_subinterpreter.cpp)
 pybind11_enable_warnings(test_embed)