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, 14 insertions, 0 deletions

diff --git a/ext/pybind11/tests/test_builtin_casters.cpp b/ext/pybind11/tests/test_builtin_casters.cpp
index b73e96ea5..e026127f8 100644
--- a/ext/pybind11/tests/test_builtin_casters.cpp
+++ b/ext/pybind11/tests/test_builtin_casters.cpp
@@ -50,7 +50,9 @@ TEST_SUBMODULE(builtin_casters, m) {
     // test_single_char_arguments
     m.attr("wchar_size") = py::cast(sizeof(wchar_t));
     m.def("ord_char", [](char c) -> int { return static_cast<unsigned char>(c); });
+    m.def("ord_char_lv", [](char &c) -> int { return static_cast<unsigned char>(c); });
     m.def("ord_char16", [](char16_t c) -> uint16_t { return c; });
+    m.def("ord_char16_lv", [](char16_t &c) -> uint16_t { return c; });
     m.def("ord_char32", [](char32_t c) -> uint32_t { return c; });
     m.def("ord_wchar", [](wchar_t c) -> int { return c; });
 
@@ -153,4 +155,16 @@ TEST_SUBMODULE(builtin_casters, m) {
     // test_complex
     m.def("complex_cast", [](float x) { return "{}"_s.format(x); });
     m.def("complex_cast", [](std::complex<float> x) { return "({}, {})"_s.format(x.real(), x.imag()); });
+
+    // test int vs. long (Python 2)
+    m.def("int_cast", []() {return (int) 42;});
+    m.def("long_cast", []() {return (long) 42;});
+    m.def("longlong_cast", []() {return  ULLONG_MAX;});
+
+    /// test void* cast operator
+    m.def("test_void_caster", []() -> bool {
+        void *v = (void *) 0xabcd;
+        py::object o = py::cast(v);
+        return py::cast<void *>(o) == v;
+    });
 }