Compiler Warnings C4600 Through C4799
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Compiler Warnings C4600 Through C4799

 

The articles in this part of the documentation contain information about a subset of the Visual C++ compiler warnings. You can access the information here or, in the Output window in Visual Studio, you can select an error number and then press the F1 key.

In This Section

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) 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) C4609

'%$S' derives from default interface '%$S' on type '%$S'. Use a different default interface for '%$S', 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

'%$S': 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 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 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 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) C4693

'class': a sealed abstract class cannot have any instance members 'instance member'

Compiler warning (level 1) 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 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) 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 '%s' 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 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 C4770

partially validated enum '%s' used as index

Compiler Warning (level 1) C4772

#import referenced a type from a missing type library; 'missing_type' used as a placeholder

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:\n\t'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

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