[smart_holder] Introduce PYBIND11_SMART_HOLDER_DISABLE option.
#5348
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added 4 commits
September 1, 2024 12:03
… under include/pybind11/ At the stage `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent.
…SUPPORT` with `PYBIND11_SMART_HOLDER_ENABLED` under tests/ and ubench/ As at the previous stage, `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent.
…ning-as-error under macos-13
```
/Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:23: error: unused parameter 'm' [-Werror,-Wunused-parameter]
void wrap(py::module_ m, const char *py_class_name) {
^
/Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:38: error: unused parameter 'py_class_name' [-Werror,-Wunused-parameter]
void wrap(py::module_ m, const char *py_class_name) {
^
2 errors generated.
```
rwgk
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to rwgk/pybind11
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Sep 2, 2024
…ind#5348) * Step 1: Establish new `PYBIND11_SMART_HOLDER_ENABLED` macro, but only under include/pybind11/ At the stage `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent. * Systematically replace all `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` with `PYBIND11_SMART_HOLDER_ENABLED` under tests/ and ubench/ As at the previous stage, `PYBIND11_HAS_INTERNALS_WITH_SMART_HOLDER_SUPPORT` and `PYBIND11_SMART_HOLDER_ENABLED` are still equivalent. * Introduce `PYBIND11_SMART_HOLDER_DISABLE` option. * `#ifdef` out entire `wrap()` function to avoid `unused-parameter` warning-as-error under macos-13 ``` /Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:23: error: unused parameter 'm' [-Werror,-Wunused-parameter] void wrap(py::module_ m, const char *py_class_name) { ^ /Users/runner/work/pybind11/pybind11/tests/test_class_sh_trampoline_basic.cpp:67:38: error: unused parameter 'py_class_name' [-Werror,-Wunused-parameter] void wrap(py::module_ m, const char *py_class_name) { ^ 2 errors generated. ```
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Description
Introduce a
PYBIND11_SMART_HOLDER_DISABLEmacro.Note that the
PYBIND11_INTERNALS_IDis identical with and without that define.That way the smart_holder feature is available by default, but users concerned about compile-time or runtime overhead can use the macro to essentially eliminate the overhead completely, without breaking full internals-compatibility with pybind11 extensions that have the smart_holder feature enabled.
Probably, the extra time the preprocessor needs to strip out the smart_holder code is virtually unmeasurable. The extra compile time for the tiny internals addition is probably also unmeasurable.
See also: #5339 (comment)
Suggested changelog entry: