ext: Updated Pybind11 to version 2.4.1.

This updates Pybind11 from version 2.2.1 to version 2.4.1. This fixes
warning/error received when "<experiment/optional>" is used when
compiling using c++14 with clang. It should be noted that
"ext/pybind11/include/pybind11/std.h" has been changed to include a fix
added by commit ba42457254cc362eddc099f22b60d469cc6369e0. This is
necessary to avoid build errors.

Built: Linux (gcc, c++11) and MacOS (clang, c++14).
Tested: Ran quick tests for X86, ARM, and RISC-V.
Deprecates: https://gem5-review.googlesource.com/c/public/gem5/+/21019
Change-Id: Ie9783511cb6be50136076a55330e645f4f36d075
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/21119
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/ext/pybind11/tests/test_gil_scoped.cpp b/ext/pybind11/tests/test_gil_scoped.cpp
new file mode 100644
index 000000000..76c17fdc7
--- /dev/null
+++ b/ext/pybind11/tests/test_gil_scoped.cpp
@@ -0,0 +1,52 @@
+/*
+    tests/test_gil_scoped.cpp -- acquire and release gil
+
+    Copyright (c) 2017 Borja Zarco (Google LLC) <bzarco@google.com>
+
+    All rights reserved. Use of this source code is governed by a
+    BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/functional.h>
+
+
+class VirtClass  {
+public:
+    virtual ~VirtClass() {}
+    virtual void virtual_func() {}
+    virtual void pure_virtual_func() = 0;
+};
+
+class PyVirtClass : public VirtClass {
+    void virtual_func() override {
+        PYBIND11_OVERLOAD(void, VirtClass, virtual_func,);
+    }
+    void pure_virtual_func() override {
+        PYBIND11_OVERLOAD_PURE(void, VirtClass, pure_virtual_func,);
+    }
+};
+
+TEST_SUBMODULE(gil_scoped, m) {
+  py::class_<VirtClass, PyVirtClass>(m, "VirtClass")
+      .def(py::init<>())
+      .def("virtual_func", &VirtClass::virtual_func)
+      .def("pure_virtual_func", &VirtClass::pure_virtual_func);
+
+    m.def("test_callback_py_obj",
+          [](py::object func) { func(); });
+    m.def("test_callback_std_func",
+          [](const std::function<void()> &func) { func(); });
+    m.def("test_callback_virtual_func",
+          [](VirtClass &virt) { virt.virtual_func(); });
+    m.def("test_callback_pure_virtual_func",
+          [](VirtClass &virt) { virt.pure_virtual_func(); });
+    m.def("test_cross_module_gil",
+          []() {
+              auto cm = py::module::import("cross_module_gil_utils");
+              auto gil_acquire = reinterpret_cast<void (*)()>(
+                  PyLong_AsVoidPtr(cm.attr("gil_acquire_funcaddr").ptr()));
+              py::gil_scoped_release gil_release;
+              gil_acquire();
+          });
+}