1st manual pass, builds & tests with unix_clang, before pre-commit.

include/pybind11/detail/common.h

@@ -47,7 +47,7 @@
 // or newer.
 #    if _MSVC_LANG >= 201402L
 #        define PYBIND11_CPP14
-#        if _MSVC_LANG > 201402L && _MSC_VER >= 1910
+#        if _MSVC_LANG > 201402L
 #            define PYBIND11_CPP17
 #            if _MSVC_LANG >= 202002L
 #                define PYBIND11_CPP20
@@ -147,7 +147,7 @@
 
 /* Don't let Python.h #define (v)snprintf as macro because they are implemented
    properly in Visual Studio since 2015. */
-#if defined(_MSC_VER) && _MSC_VER >= 1900
+#if defined(_MSC_VER)
 #    define HAVE_SNPRINTF 1
 #endif
 
@@ -559,7 +559,7 @@ static_assert(std::is_standard_layout<instance>::value,
               "Internal error: `pybind11::detail::instance` is not standard layout!");
 
 /// from __cpp_future__ import (convenient aliases from C++14/17)
-#if defined(PYBIND11_CPP14) && (!defined(_MSC_VER) || _MSC_VER >= 1910)
+#if defined(PYBIND11_CPP14)
 using std::conditional_t;
 using std::enable_if_t;
 using std::remove_cv_t;
@@ -1116,7 +1116,7 @@ try_get_shared_from_this(std::enable_shared_from_this<T> *holder_value_ptr) {
 
 // For silencing "unused" compiler warnings in special situations.
 template <typename... Args>
-#if defined(_MSC_VER) && _MSC_VER >= 1910 && _MSC_VER < 1920 // MSVC 2017
+#if defined(_MSC_VER) && _MSC_VER < 1920 // MSVC 2017
 constexpr
 #endif
     inline void

tests/pybind11_tests.h

@@ -3,12 +3,6 @@
 #include <pybind11/eval.h>
 #include <pybind11/pybind11.h>
 
-#if defined(_MSC_VER) && _MSC_VER < 1910
-// We get some really long type names here which causes MSVC 2015 to emit warnings
-#    pragma warning(                                                                              \
-        disable : 4503) // NOLINT: warning C4503: decorated name length exceeded, name was truncated
-#endif
-
 namespace py = pybind11;
 using namespace pybind11::literals;
 

tests/test_class.cpp

@@ -356,11 +356,7 @@ TEST_SUBMODULE(class_, m) {
 
     py::class_<ProtectedA>(m, "ProtectedA")
         .def(py::init<>())
-#if !defined(_MSC_VER) || _MSC_VER >= 1910
         .def("foo", &PublicistA::foo);
-#else
-        .def("foo", static_cast<int (ProtectedA::*)() const>(&PublicistA::foo));
-#endif
 
     class ProtectedB {
     public:
@@ -391,11 +387,7 @@ TEST_SUBMODULE(class_, m) {
 
     py::class_<ProtectedB, TrampolineB>(m, "ProtectedB")
         .def(py::init<>())
-#if !defined(_MSC_VER) || _MSC_VER >= 1910
         .def("foo", &PublicistB::foo);
-#else
-        .def("foo", static_cast<int (ProtectedB::*)() const>(&PublicistB::foo));
-#endif
 
     // test_brace_initialization
     struct BraceInitialization {

tests/test_const_name.cpp

@@ -4,13 +4,6 @@
 
 #include "pybind11_tests.h"
 
-#if defined(_MSC_VER) && _MSC_VER < 1910
-
-// MSVC 2015 fails in bizarre ways.
-#    define PYBIND11_SKIP_TEST_CONST_NAME
-
-#else // Only test with MSVC 2017 or newer.
-
 // IUT = Implementation Under Test
 #    define CONST_NAME_TESTS(TEST_FUNC, IUT)                                                      \
         std::string TEST_FUNC(int selector) {                                                     \
@@ -51,18 +44,10 @@ CONST_NAME_TESTS(const_name_tests, py::detail::const_name)
 CONST_NAME_TESTS(underscore_tests, py::detail::_)
 #    endif
 
-#endif // MSVC >= 2017
-
 TEST_SUBMODULE(const_name, m) {
-#ifdef PYBIND11_SKIP_TEST_CONST_NAME
-    m.attr("const_name_tests") = "PYBIND11_SKIP_TEST_CONST_NAME";
-#else
     m.def("const_name_tests", const_name_tests);
-#endif
 
-#ifdef PYBIND11_SKIP_TEST_CONST_NAME
-    m.attr("underscore_tests") = "PYBIND11_SKIP_TEST_CONST_NAME";
-#elif defined(PYBIND11_DETAIL_UNDERSCORE_BACKWARD_COMPATIBILITY)
+#if defined(PYBIND11_DETAIL_UNDERSCORE_BACKWARD_COMPATIBILITY)
     m.def("underscore_tests", underscore_tests);
 #else
     m.attr("underscore_tests") = "PYBIND11_DETAIL_UNDERSCORE_BACKWARD_COMPATIBILITY not defined.";

tests/test_eigen.cpp

@@ -14,9 +14,6 @@
 #include "pybind11_tests.h"
 
 #if defined(_MSC_VER)
-#    if _MSC_VER < 1910                 // VS 2015's MSVC
-#        pragma warning(disable : 4127) // C4127: conditional expression is constant
-#    endif
 #    pragma warning(disable : 4996) // C4996: std::unary_negation is deprecated
 #endif
 

tests/test_factory_constructors.cpp

@@ -381,13 +381,6 @@ TEST_SUBMODULE(factory_constructors, m) {
             ::operator delete(p);
         }
         static void operator delete(void *, void *) { py::print("noisy placement delete"); }
-#if defined(_MSC_VER) && _MSC_VER < 1910
-        // MSVC 2015 bug: the above "noisy delete" isn't invoked (fixed in MSVC 2017)
-        static void operator delete(void *p) {
-            py::print("noisy delete");
-            ::operator delete(p);
-        }
-#endif
     };
 
     py::class_<NoisyAlloc> pyNoisyAlloc(m, "NoisyAlloc");

tests/test_iostream.cpp

@@ -7,10 +7,6 @@
     BSD-style license that can be found in the LICENSE file.
 */
 
-#if defined(_MSC_VER) && _MSC_VER < 1910 // VS 2015's MSVC
-#    pragma warning(disable : 4702)      // unreachable code in system header (xatomic.h(382))
-#endif
-
 #include <pybind11/iostream.h>
 
 #include "pybind11_tests.h"

tests/test_smart_ptr.cpp

@@ -8,10 +8,6 @@
     BSD-style license that can be found in the LICENSE file.
 */
 
-#if defined(_MSC_VER) && _MSC_VER < 1910 // VS 2015's MSVC
-#    pragma warning(disable : 4702)      // unreachable code in system header (xatomic.h(382))
-#endif
-
 #include "object.h"
 #include "pybind11_tests.h"
 

tests/test_stl.cpp

@@ -37,7 +37,7 @@ struct type_caster<boost::none_t> : void_caster<boost::none_t> {};
 // Test with `std::variant` in C++17 mode, or with `boost::variant` in C++11/14
 #if defined(PYBIND11_HAS_VARIANT)
 using std::variant;
-#elif defined(PYBIND11_TEST_BOOST) && (!defined(_MSC_VER) || _MSC_VER >= 1910)
+#elif defined(PYBIND11_TEST_BOOST)
 #    include <boost/variant.hpp>
 #    define PYBIND11_HAS_VARIANT 1
 using boost::variant;