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Learn more about: Compiler warnings C4600 Through C4799 |
Compiler warnings C4600 Through C4799 |
05/03/2021 |
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22bd4392-f3be-445c-9f23-6126aebac901 |
The articles in this section of the documentation explain a subset of the warning messages that are generated by the compiler.
[!INCLUDEerror-boilerplate]
| Warning | Message |
|---|---|
| Compiler warning (level 1) C4600 | #pragma 'macro name': expected a valid non-empty string |
| Compiler warning (level 1) C4602 | #pragma pop_macro: 'macro name' no previous #pragma push_macro for this identifier |
| Compiler warning (level 1) C4603 | 'identifier': macro is not defined or definition is different after precompiled header use |
| Compiler warning (level 1) C4604 | 'type': passing argument by value across native and managed boundary requires valid copy constructor. Otherwise the runtime behavior is undefined |
| Compiler warning (level 1) C4605 | '/Dmacro' specified on current command line, but was not specified when precompiled header was built |
| Compiler warning (level 1) C4606 | #pragma warning: 'warning number' ignored; Code Analysis warnings are not associated with warning levels |
| Compiler warning (level 3) C4608 | 'union_member' has already been initialized by another union member in the initializer list, 'union_member' |
| Compiler warning (level 3, Error) C4609 | 'type1' derives from default interface 'interface' on type 'type2'. Use a different default interface for 'type1', or break the base/derived relationship. |
| Compiler warning (level 4) C4610 | object 'class' can never be instantiated - user defined constructor required |
| Compiler warning (level 4) C4611 | interaction between 'function' and C++ object destruction is non-portable |
| Compiler warning (level 1) C4612 | error in include filename |
| Compiler warning (level 1) C4613 | 'symbol': class of segment cannot be changed |
| Compiler warning (level 1) C4615 | #pragma warning: unknown user warning type |
| Compiler warning (level 1) C4616 | #pragma warning: warning number 'number' not a valid compiler warning |
| Compiler warning (level 1) C4618 | pragma parameters included an empty string; pragma ignored |
| Compiler warning (level 3) C4619 | #pragma warning: there is no warning number 'number' |
| Compiler warning (level 1) C4620 | no postfix form of 'operator ++' found for type 'type', using prefix form |
| Compiler warning (level 1) C4621 | no postfix form of 'operator --' found for type 'type', using prefix form |
| Compiler warning (level 3) C4622 | overwriting debug information formed during creation of the precompiled header in object file: 'file' |
| Compiler warning (level 4) C4623 | 'derived class': default constructor was implicitly defined as deleted because a base class default constructor is inaccessible or deleted |
| Compiler warning (level 1) C4624 | 'derived class': destructor was implicitly defined as deleted because a base class destructor is inaccessible or deleted |
| Compiler warning (level 4) C4625 | 'derived class': copy constructor was implicitly defined as deleted because a base class copy constructor is inaccessible or deleted |
| Compiler warning (level 4) C4626 | 'derived class': assignment operator was implicitly defined as deleted because a base class assignment operator is inaccessible or deleted |
| Compiler warning (level 1) C4627 | '<identifier>': skipped when looking for precompiled header use |
| Compiler warning (level 1) C4628 | digraphs not supported with -Ze. Character sequence 'digraph' not interpreted as alternate token for '%s' |
| Compiler warning (level 4) C4629 | digraph used, character sequence 'digraph' interpreted as token 'char' (insert a space between the two characters if this is not what you intended) |
| Compiler warning (level 1) C4630 | 'symbol': 'extern' storage-class specifier illegal on member definition |
| Compiler warning (level 2) C4631 | MSXML or XPath unavailable, XML document comments will not be processed. reason |
| Compiler warning (level 1) C4632 | XML document comment: file - access denied: reason |
| Compiler warning (level 3) C4633 | XML document comment target: error: reason |
| Compiler warning (level 4) C4634 | XML document comment target: cannot be applied: reason |
| Compiler warning (level 3) C4635 | XML document comment target: badly-formed XML: reason |
| Compiler warning (level 3) C4636 | XML document comment applied to construct: tag requires non-empty 'attribute' attribute. |
| Compiler warning (level 3 and level 4) C4637 | XML document comment target: <include> tag discarded. Reason |
| Compiler warning (level 3) C4638 | XML document comment target: reference to unknown symbol 'symbol'. |
| Compiler warning (level 4) C4639 | MSXML error, XML document comments will not be processed. Reason |
| Compiler warning (level 3) C4640 | 'instance': construction of local static object is not thread-safe |
| Compiler warning (level 3) C4641 | XML document comment has an ambiguous cross reference: |
| Compiler warning (level 3) C4645 | function declared with __declspec(noreturn) has a return statement |
| Compiler warning (level 3) C4646 | function declared with __declspec(noreturn) has non-void return type |
| Compiler warning (level 3) C4647 | behavior change: __is_pod(type) has different value in previous versions |
| Compiler warning (level 3) C4648 | standard attribute 'carries_dependency' is ignored |
| Compiler warning (level 3) C4649 | attributes are ignored in this context |
| Compiler warning (level 1) C4650 | debugging information not in precompiled header; only global symbols from the header will be available |
| Compiler warning (level 1) C4651 | 'definition' specified for precompiled header but not for current compile |
| Compiler warning (level 1) C4652 | compiler option 'option' inconsistent with precompiled header; current command-line option will override that defined in the precompiled header |
| Compiler warning (level 2) C4653 | compiler option 'option' inconsistent with precompiled header; current command-line option ignored |
| Compiler warning (level 4) C4654 | Code placed before include of precompiled header line will be ignored. Add code to precompiled header. |
| Compiler warning (level 1) C4655 | 'symbol': variable type is new since the latest build, or is defined differently elsewhere |
| Compiler warning (level 1) C4656 | 'symbol': data type is new or has changed since the latest build, or is defined differently elsewhere |
| Compiler warning (level 1) C4657 | expression involves a data type that is new since the latest build |
| Compiler warning (level 1) C4658 | 'function': function prototype is new since the latest build, or is declared differently elsewhere |
| Compiler warning (level 1) C4659 | #pragma 'pragma': use of reserved segment 'segment' has undefined behavior, use #pragma comment(linker, ...) |
| Compiler warning (level 1) C4661 | 'identifier': no suitable definition provided for explicit template instantiation request |
| Compiler warning (level 1) C4662 | explicit instantiation; template-class 'identifier1' has no definition from which to specialize 'identifier2' |
| Compiler warning (level 1) C4667 | 'function': no function template defined that matches forced instantiation |
| Compiler warning (level 4) C4668 | 'symbol' is not defined as a preprocessor macro, replacing with '0' for 'directive' |
| Compiler warning (level 1) C4669 | 'cast': unsafe conversion: 'class' is a managed type object |
| Compiler warning (level 4) C4670 | 'identifier': this base class is inaccessible |
| Compiler warning (level 4) C4671 | 'identifier': the copy constructor is inaccessible |
| Compiler warning (level 4) C4672 | 'identifier1': ambiguous. First seen as 'identifier2' |
| Compiler warning (level 4) C4673 | throwing 'identifier' the following types will not be considered at the catch site |
| Compiler warning (level 1) C4674 | 'method' should be declared 'static' and have exactly one parameter |
| Compiler warning (level 4) C4676 | '%s': the destructor is inaccessible |
| Compiler warning (level 1) C4677 | 'function': signature of non-private member contains assembly private type 'private_type' |
| Compiler warning (level 1) C4678 | base class 'base_type' is less accessible than 'derived_type' |
| Compiler warning (level 1) C4679 | 'member': could not import member |
| Compiler warning (level 4) C4680 | 'class': coclass does not specify a default interface |
| Compiler warning (level 4) C4681 | 'class': coclass does not specify a default interface that is an event source |
| Compiler warning (level 4) C4682 | 'parameter': no directional parameter attribute specified, defaulting to [in] |
| Compiler warning (level 1) C4683 | 'function': event source has an 'out'-parameter; exercise caution when hooking multiple event handlers |
| Compiler warning (level 1) C4684 | 'attribute': WARNING!! attribute may cause invalid code generation: use with caution |
| Compiler warning (level 1) C4685 | expecting '> >' found '>>' when parsing template parameters |
| Compiler warning (level 3) C4686 | 'user-defined type': possible change in behavior, change in UDT return calling convention |
| Compiler warning (Error) C4687 | 'class': a sealed abstract class cannot implement an interface 'interface' |
| Compiler warning (level 1) C4688 | 'constraint': constraint list contains assembly private type 'type' |
| Compiler warning (level 1) C4689 | '%c': unsupported character in #pragma detect_mismatch; #pragma ignored |
| Compiler warning (level 4) C4690 | [ emitidl( pop ) ]: more pops than pushes |
| Compiler warning (level 1) C4691 | 'type': type referenced was expected in unreferenced assembly 'file', type defined in current translation unit used instead |
| Compiler warning (level 1) C4692 | 'function': signature of non-private member contains assembly private native type 'native_type' |
| Compiler warning (level 1, Error) C4693 | 'class': a sealed abstract class cannot have any instance members 'instance member' |
| Compiler warning (level 1, Error) C4694 | 'class': a sealed abstract class cannot have a base-class 'base_class' |
| Compiler warning (level 1) C4695 | #pragma execution_character_set: 'character set' is not a supported argument: currently only 'UTF-8' is supported |
| Compiler warning (level 1) C4696 | /ZBvalue1 option out of range; assuming 'value2' |
| Compiler warning (level 3) C4698 | 'feature' is for evaluation purposes only and is subject to change or removal in future updates. |
| Compiler warning (level 1 and level 4) C4700 | uninitialized local variable 'name' used |
| Compiler warning (level 4) C4701 | potentially uninitialized local variable 'name' used |
| Compiler warning (level 4) C4702 | unreachable code |
| Compiler warning (level 4) C4703 | potentially uninitialized local pointer variable '%s' used |
| Compiler warning (level 4) C4706 | assignment within conditional expression |
| Compiler warning (level 4) C4709 | comma operator within array index expression |
| Compiler warning (level 4) C4710 | 'function': function not inlined |
| Compiler warning (level 1) C4711 | function 'function' selected for automatic inline expansion |
| Compiler warning (level 4) C4714 | function 'function' marked as __forceinline not inlined |
| Compiler warning (level 1) C4715 | 'function': not all control paths return a value |
| Compiler warning (level 1, Error) C4716 | 'function': must return a value |
| Compiler warning (level 1) C4717 | 'function': recursive on all control paths, function will cause runtime stack overflow |
| Compiler warning (level 4) C4718 | 'function call': recursive call has no side effects, deleting |
| Compiler warning (level 1) C4719 | Double constant found when Qfast specified - use 'f' as a suffix to indicate single precision |
| Compiler warning (level 2) C4720 | in-line assembler reports: 'message' |
| Compiler warning (level 1) C4721 | 'function': not available as an intrinsic |
| Compiler warning (level 1) C4722 | 'function': destructor never returns, potential memory leak |
| Compiler warning (level 3) C4723 | potential divide by 0 |
| Compiler warning (level 3) C4724 | potential mod by 0 |
| Compiler warning (level 3) C4725 | instruction may be inaccurate on some Pentiums |
| Compiler warning (level 1) C4727 | PCH named pch_file with same timestamp found in obj_file_1 and obj_file_2. Using first PCH. |
| Compiler warning (level 1) C4728 | /Yl- option ignored because PCH reference is required |
| Compiler warning (level 4) C4729 | function too big for flow graph based warnings |
| Compiler warning (Level 1) C4730Compiler warning (level 1) C4730 | 'main': mixing _m64 and floating point expressions may result in incorrect code |
| Compiler warning (Level 1) C4731 | 'pointer': frame pointer register 'register' modified by inline assembly code |
| Compiler warning (level 1) C4732 | intrinsic '%s' is not supported in this architecture |
| Compiler warning (Level 1) C4733 | Inline asm assigning to 'FS:0': handler not registered as safe handler |
| Compiler warning (Level 3) C4738 | storing 32-bit float result in memory, possible loss of performance |
| Compiler warning (level 1) C4739 | reference to variable 'var' exceeds its storage space |
| Compiler warning (Level 4) C4740 | flow in or out of inline asm code suppresses global optimization |
| Compiler warning (Level 1) C4742 | 'var' has different alignment in 'file1' and 'file2': number and number |
| Compiler warning (Level 1) C4743 | 'type' has different size in 'file1' and 'file2': number and number bytes |
| Compiler warning (Level 1) C4744 | 'var' has different type in 'file1' and 'file2': 'type1' and 'type2' |
| Compiler warning C4746 | volatile access of 'expression' is subject to /volatile:<iso|ms> setting; consider using __iso_volatile_load/store intrinsic functions |
| Compiler warning (level 1) C4747 | Calling managed 'entrypoint': Managed code may not be run under loader lock, including the DLL entrypoint and calls reached from the DLL entrypoint |
| Compiler warning (level 4) C4749 | conditionally supported: offsetof applied to non-standard-layout type 'type' |
| Compiler warning (level 1) C4750 | 'identifier': function with _alloca() inlined into a loop |
| Compiler warning (level 4) C4751 | /arch:AVX does not apply to Intel(R) Streaming SIMD Extensions that are within inline ASM |
| Compiler warning (level 4) C4752 | found Intel(R) Advanced Vector Extensions; consider using /arch:AVX |
| Compiler warning (level 4) C4754 | Conversion rules for arithmetic operations in the comparison at %s(%d) mean that one branch cannot be executed. Cast '%s' to '%s' (or similar type of %d bytes). |
| Compiler warning C4755 | Conversion rules for arithmetic operations in the comparison at %s(%d) mean that one branch cannot be executed in an inlined function. Cast '%s' to '%s' (or similar type of %d bytes). |
| Compiler warning (level 2) C4756 | overflow in constant arithmetic |
| Compiler warning (level 4) C4757 | subscript is a large unsigned value, did you intend a negative constant? |
| Compiler warning (level 4) C4764 | Can not align catch objects to greater than 16 bytes |
| Compiler warning (level 4) C4767 | section name '%s' is longer than 8 characters and will be truncated by the linker |
| Compiler warning (level 3) C4768 | __declspec attributes before linkage specification are ignored |
| Compiler warning (level 4) C4770 | partially validated enum 'name' used as index |
| Compiler warning C4771 | Bounds must be created using a simple pointer; MPX intrinsic function ignored |
| Compiler warning (level 1, Error) C4772 | #import referenced a type from a missing type library; 'missing_type' used as a placeholder |
| Compiler warning (level 4) C4774 | 'string' : format string expected in argument number is not a string literal |
| Compiler warning (level 3) C4775 | nonstandard extension used in format string 'string' of function 'function' |
| Compiler warning (level 1) C4776 | '%character' is not allowed in the format string of function 'function' |
| Compiler warning (level 4) C4777 | 'function' : format string 'string' requires an argument of type 'type1', but variadic argument number has type 'type2' |
| Compiler warning (level 3) C4778 | 'function' : unterminated format string 'string' |
| Compiler warning (Level 1) C4788 | 'identifier': identifier was truncated to 'number' characters |
| Compiler warning (Level 1) C4789 | buffer 'identifier' of size N bytes will be overrun; M bytes will be written starting at offset L |
| Compiler warning (level 2) C4792 | function '%s' declared using sysimport and referenced from native code; import library required to link |
| Compiler warning (level 1 and 3) C4793 | 'function': function compiled as native: 'reason' |
| Compiler warning (level 1) C4794 | segment of thread local storage variable '%s' changed from '%s' to '%s' |
| Compiler warning (level 1) C4799 | function 'function' has no EMMS instruction |
C/C++ Compiler and build tools errors and warnings
Compiler warnings C4000 - C5999