| [C4841](../error-messages/compiler-warnings/c4841.md) (level 4) | non-standard extension used: compound member designator used in offsetof |

| C4842 (level 4) | the result of 'offsetof' applied to a type using multiple inheritance is not guaranteed to be consistent between compiler releases |

| [C4866](../error-messages/compiler-warnings/c4866.md) (level 4) | '*file*(*line-number*)' compiler may not enforce left-to-right evaluation order for call to *operator* |

| [C4905](../error-messages/compiler-warnings/compiler-warning-level-1-c4905.md) (level 1) | wide string literal cast to 'LPSTR' |

| [C4906](../error-messages/compiler-warnings/compiler-warning-level-1-c4906.md) (level 1) | string literal cast to 'LPWSTR' |

| [C4917](../error-messages/compiler-warnings/compiler-warning-level-1-c4917.md) (level 1) | '*declarator*': a GUID can only be associated with a class, interface, or namespace |

| C5029 (level 4) | nonstandard extension used: alignment attributes in C++ apply to variables, data members and tag types only |

| C5031 (level 4) | #pragma warning(pop): likely mismatch, popping warning state pushed in different file ^14.1 |

| C5032 (level 4) | detected #pragma warning(push) with no corresponding #pragma warning(pop) ^14.1 |

| C5034 | use of intrinsic '*intrinsic*' causes function *function-name* to be compiled as guest code ^15.3 |

| C5035 | use of feature '*feature*' causes function *function-name* to be compiled as guest code ^15.3 |

| C5036 (level 1) | varargs function pointer conversion when compiling with /hybrid:x86arm64 '*type1*' to '*type2*' ^15.3 |

| C5041 (level 4) | '*member-name*': out-of-line definition for constexpr static data member is not needed and is deprecated in C++17. ^15.2 |

| C5042 (level 3) | '*function*': function declarations at block scope cannot be specified 'inline' in standard C++; remove 'inline' specifier ^15.5 |

| [C5045](../error-messages/compiler-warnings/c5045.md) | Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified ^15.7 |

| C5204 (level 3) | A class with virtual functions has non-virtual trivial destructor. ^16.5 |

| C5214 (level 4) | applying '*keyword*' to an operand with a volatile qualified type is deprecated in C++20 ^16.7 |

| C5215 (level 4) | '*function-parameter*' a function parameter with a volatile qualified type is deprecated in C++20 ^16.7 |

| C5246 (level 1) | '*member*': the initialization of a subobject should be wrapped in braces ^16.10 |

| [C5247 (level 1)](../error-messages/compiler-warnings/c5247.md) | Section '*section-name*' is reserved for C++ dynamic initialization. Manually creating the section will interfere with C++ dynamic initialization and may lead to undefined behavior ^16.11 |

| [C5248 (level 1)](../error-messages/compiler-warnings/c5248.md) | Section '*section-name*' is reserved for C++ dynamic initialization. Variable manually put into the section may be optimized out and its order relative to compiler generated dynamic initializers is unspecified ^16.11 |

| C5249 (level 1) | '*bitfield*' of type '*enumeration_name*' has named enumerators with values that cannot be represented in the given bit field width of '*bitfield_width*'. ^17.0 |

| C5250 (level 3) | '*function_name*': intrinsic function not declared. ^17.0 |

| C5251 (level 4) | *segment-name* changed after including header ^17.1 |

| C5254 (level 4) | language feature 'terse static assert' requires compiler flag '/std:c++17' ^17.1 |

| C5256 (level 1) | '*enumeration*': a non-defining declaration of an enumeration with a fixed underlying type is only permitted as a standalone declaration ^17.2 |

| C5258 (level 4) | explicit capture of '*symbol*' is not required for this use ^17.2 |

| C5263 (level 4) | calling '`std::move`' on a temporary object prevents copy elision ^17.4 |

| C5264 (level 4) | '*variable-name*': 'const' variable is not used ^17.4 |