Microsoft C/C++ compiler warnings C5000 through C5199
The articles in this section describe Microsoft C/C++ compiler warning messages C5000 through C5199.
Important
The Visual Studio compilers and build tools can report many kinds of errors and warnings. After an error or warning is found, the build tools may make assumptions about code intent and attempt to continue, so that more issues can be reported at the same time. If the tools make the wrong assumption, later errors or warnings may not apply to your project. When you correct issues in your project, always start with the first error or warning that's reported, and rebuild often. One fix may make many subsequent errors go away.
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Note
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You may find additional assistance for errors and warnings in Microsoft Learn Q&A forums. Or, search for the error or warning number on the Visual Studio C++ Developer Community site. You can also search Stack Overflow to find solutions.
For links to additional help and community resources, see Visual C++ Help and Community.
Warning messages
| Warning | Message |
|---|---|
| Compiler warning C5022 | 'type': multiple move constructors specified |
| Compiler warning C5023 | 'type': multiple move assignment operators specified |
| Compiler warning (level 4, off) C5024 | 'type': move constructor was implicitly defined as deleted |
| Compiler warning (level 4, off) C5025 | 'type': move assignment operator was implicitly defined as deleted |
| Compiler warning (level 1 and level 4, off) C5026 | 'type': move constructor was implicitly defined as deleted |
| Compiler warning (level 1 and level 4, off) C5027 | 'type': move assignment operator was implicitly defined as deleted |
| Compiler warning (level 1) C5028 | 'name': Alignment specified in prior declaration (number) not specified in definition |
| Compiler warning (level 4, off) C5029 | nonstandard extension used: alignment attributes in C++ apply to variables, data members and tag types only |
| Compiler warning (level 3) C5030 | attribute 'attribute-name' is not recognized |
| Compiler warning (level 4, off) C5031 | #pragma warning(pop): likely mismatch, popping warning state pushed in different file |
| Compiler warning (level 4, off) C5032 | detected #pragma warning(push) with no corresponding #pragma warning(pop) |
| Compiler warning (level 1) C5033 | 'storage-class' is no longer a supported storage class |
| Compiler warning (level 5, off) C5034 | use of intrinsic 'intrinsic' causes function function-name to be compiled as guest code |
| Compiler warning (level 5, off) C5035 | use of feature 'feature' causes function function-name to be compiled as guest code |
| Compiler warning (level 1) C5036 | varargs function pointer conversion when compiling with /hybrid:x86arm64 'type1' to 'type2' |
| Compiler warning (error) C5037 | 'member-function': an out-of-line definition of a member of a class template cannot have default arguments |
| Compiler warning (level 4, off) C5038 | data member 'member1' will be initialized after data member 'member2' |
| Compiler warning (level 4, off) C5039 | 'function': pointer or reference to potentially throwing function passed to extern C function under -EHc. Undefined behavior may occur if this function throws an exception. |
| Compiler warning (level 3) C5040 | dynamic exception specifications are valid only in C++14 and earlier; treating as noexcept(false) |
| Compiler warning (level 1, off) C5041 | 'definition': out-of-line definition for constexpr static data member is not needed and is deprecated in C++17 |
| Compiler warning (level 3, off) C5042 | 'declaration': function declarations at block scope cannot be specified 'inline' in standard C++; remove 'inline' specifier |
| Compiler warning (level 2) C5043 | 'specification': exception specification does not match previous declaration |
| Compiler warning (level 4) C5044 | An argument to command-line option option-name points to a path 'path-name' that does not exist |
| Compiler warning (level 4) C5045 | Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified |
| Compiler warning (level 2) C5046 | 'function': Symbol involving type with internal linkage not defined |
| Compiler warning (level 1) C5047 | use of nonstandard __if_exists with modules is not supported |
| Compiler warning (level 1) C5048 | Use of macro 'macroname' may result in non-deterministic output |
| Compiler warning (level 1) C5049 | 'string': Embedding a full path may result in machine-dependent output |
| Compiler warning (level 1) C5050 | Possible incompatible environment while importing module 'module_name': issue |
| Compiler warning (level 1) C5051 | attribute 'attribute-name' requires at least 'standard-level'; ignored |
| Compiler warning (level 3, off) C5052 | Keyword 'keyword-name' was introduced in C++<version> and requires use of the 'option-name' command-line option |
| Compiler warning (level 1) C5053 | support for 'explicit(<expr>)' in C++17 and earlier is a vendor extension |
| Compiler warning (level 4) C5054 | operator 'operator-name': deprecated between enumerations of different types |
| Compiler warning (level 1) C5055 | operator 'operator-name': deprecated between enumerations and floating-point types |
| Compiler warning (level 1) C5056 | operator 'operator-name': deprecated for array types |
| Compiler warning (level 1) C5057 | header unit reference to 'name' already exists. Ignoring header unit 'header-name' |
| Compiler warning (level 1) C5058 | file system error: cannot find header file 'file-name' for header unit 'unit-name' |
| Compiler warning C5059 | runtime checks and address sanitizer is not currently supported - disabling runtime checks |
| Compiler warning (level 4) C5060 | /Qpar and address sanitizer not currently supported - disabling auto-parallelization |
| Compiler warning (level 4) C5061 | the use of a comma operator as a subscript expression has been deprecated |
| Compiler warning (level 4) C5062 | enum direct list initialization between 'type-1' and 'type-2' is no longer supported |
| Compiler warning (level 1) C5063 | 'std::is_constant_evaluated' always evaluates to true in manifestly constant-evaluated expressions |
| Compiler warning (level 1) C5072 | ASAN enabled without debug information emission. Enable debug info for better ASAN error reporting |
| Compiler warning (level 1) C5081 | Secure hotpatch is not supported with /GENPROFILE, /FASTGENPROFILE or /LTCG:PGI, disabling secure hotpatch. |
| Compiler warning (level 1) C5100 | __VA_ARGS__ is reserved for use in variadic macros |
| Compiler warning (level 1) C5101 | use of preprocessor directive in function-like macro argument list is undefined behavior |
| Compiler warning (level 1) C5102 | ignoring invalid command-line macro definition 'value' |
| Compiler warning (level 1) C5103 | pasting 'token1' and 'token2' does not result in a valid preprocessing token |
| Compiler warning (level 1) C5104 | found 'string1#string2' in macro replacement list, did you mean 'string1""#string2'? |
| Compiler warning (level 1) C5105 | macro expansion producing 'defined' has undefined behavior |
| Compiler warning (level 1) C5106 | macro redefined with different parameter names |
| Compiler warning (level 1) C5107 | missing terminating 'char' character |
| Compiler warning (level 1) C5108 | __VA_OPT__ is reserved for use in variadic macros |
| Compiler warning (level 1) C5109 | __VA_OPT__ use in macro requires '/Zc:preprocessor' |
| Compiler warning (level 4, off) C5110 | __VA_OPT__ is an extension prior to C++20 or C23 |
See also
C/C++ Compiler and build tools errors and warnings
Compiler warnings C4000 - C5999