support only msvc 19

include/pybind11/detail/internals.h

@@ -312,21 +312,12 @@ struct type_info {
 
 /// On Linux/OSX, changes in __GXX_ABI_VERSION__ indicate ABI incompatibility.
 /// On MSVC, mixing /MT and /MD will result in crashes. See (#4953)
-/// There is no macro for major version for MSVC, so we check for major version
-/// 19, 20, 21, 22 for now as major version 19 is MSVC 2015-2022 and we future
-/// proof for 3 major versions in the future
 #ifndef PYBIND11_BUILD_ABI
 #    if defined(__GXX_ABI_VERSION)
 #        define PYBIND11_BUILD_ABI "_cxxabi" PYBIND11_TOSTRING(__GXX_ABI_VERSION)
 #    elif defined(_MSC_VER) && defined(_DLL) && defined(_MT)
 #        if ((_MSC_VER) / 100 == 19)
 #            define PYBIND11_BUILD_ABI "_md_mscver19"
-#        elif ((_MSC_VER) / 100 == 20)
-#            define PYBIND11_BUILD_ABI "_md_mscver20"
-#        elif ((_MSC_VER) / 100 == 21)
-#            define PYBIND11_BUILD_ABI "_md_mscver21"
-#        elif ((_MSC_VER) / 100 == 22)
-#            define PYBIND11_BUILD_ABI "_md_mscver22"
 #        else
 #            error "Unknown major version for MSC_VER"
 #        endif