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Colin Robertson
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Fix link errors in error-messages (MicrosoftDocs#90)
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‎docs/error-messages/compiler-warnings/compiler-warning-c4950.md‎

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# Compiler Warning C4950
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'type_or_member' : marked as obsolete
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A member or type was marked as obsolete with the [ObsoleteAttribute](frlrfSystemObsoleteAttributeClassTopic).
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A member or type was marked as obsolete with the <xref:System.ObsoleteAttribute> attribute.
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C4950 is always issued as an error. You can turn off this warning with the `#pragma warning` or **/wd**; see [warning](../../preprocessor/warning.md) or [/w, /W0, /W1, /W2, /W3, /W4, /w1, /w2, /w3, /w4, /Wall, /wd, /we, /wo, /Wv, /WX (Warning Level)](../../build/reference/compiler-option-warning-level.md) for more information.
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C4950 is always issued as an error. You can turn off this warning by using the [warning](../../preprocessor/warning.md) pragma directive or the [/wd](../../build/reference/compiler-option-warning-level.md) compiler option.
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The following sample generates C4950:
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## Example
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The following sample generates C4950:
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```
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```cpp
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// C4950.cpp
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// compile with: /clr
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using namespace System;

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-and-3-c4793.md‎

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|--------------------|-------------|
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|Aligned data types are not supported in managed code|The CLR must be able to allocate data as needed, which might not be possible if the data is aligned with declarations such as [__m128](../../cpp/m128.md) or [align](../../cpp/align-cpp.md).|
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|Functions that use '__ImageBase' are not supported in managed code|`__ImageBase` is a special linker symbol that is typically used only by low-level native code to load a DLL.|
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|varargs are not supported by the '/clr' compiler option|Native functions cannot call managed functions that have [variable argument lists](../../misc/variable-argument-lists.md) (varargs) because the functions have different stack layout requirements. However, if you specify the `/clr:pure` compiler option, variable argument lists are supported because the assembly can contain only managed functions. For more information, see [Pure and Verifiable Code (C++/CLI)](../../dotnet/pure-and-verifiable-code-cpp-cli.md).|
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|varargs are not supported by the '/clr' compiler option|Native functions cannot call managed functions that have [variable argument lists](../../cpp/functions-with-variable-argument-lists-cpp.md) (varargs) because the functions have different stack layout requirements. However, if you specify the `/clr:pure` compiler option, variable argument lists are supported because the assembly can contain only managed functions. For more information, see [Pure and Verifiable Code (C++/CLI)](../../dotnet/pure-and-verifiable-code-cpp-cli.md).|
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|The 64-bit CLR does not support data declared with the __ptr32 modifier|A pointer must be the same size as a native pointer on the current platform. For more information, see [__ptr32, \__ptr64](../../cpp/ptr32-ptr64.md).|
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|The 32-bit CLR does not support data declared with the __ptr64 modifier|A pointer must be the same size as a native pointer on the current platform. For more information, see [__ptr32, \__ptr64](../../cpp/ptr32-ptr64.md).|
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|One or more intrinsics is not supported in managed code|The name of the intrinsic is not available at the time the message is emitted. However, an intrinsic that causes this message typically represents a low-level machine instruction.|

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4165.md‎

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# Compiler Warning (level 1) C4165
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'HRESULT' is being converted to 'bool'; are you sure this is what you want?
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When using an [HRESULT](_com_hresults) in an [if](../../cpp/if-else-statement-cpp.md) statement, the HRESULT will be converted to a [bool](../../cpp/bool-cpp.md) unless you explicitly test for the variable as an HRESULT. This warning is off by default.
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When using an HRESULT in an [if](../../cpp/if-else-statement-cpp.md) statement, the HRESULT will be converted to a [bool](../../cpp/bool-cpp.md) unless you explicitly test for the variable as an HRESULT. This warning is off by default.
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The following sample generates C4165
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## Example
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The following sample generates C4165
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```
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```cpp
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// C4165.cpp
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// compile with: /W1
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#include <windows.h>

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4190.md‎

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# Compiler Warning (level 1) C4190
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'identifier1' has C-linkage specified, but returns UDT 'identifier2' which is incompatible with C
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A function or pointer to function has a UDT (user-defined type, which is a class, structure, enum, union, or [__value](../../misc/value.md) type) as return type and `extern` "C" linkage. This is legal if:
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A function or pointer to function has a UDT (user-defined type, which is a class, structure, enum, or union) as return type and `extern` "C" linkage. This is legal if:
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- All calls to this function occur from C++.
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- The definition of the function is in C++.
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## Example
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```
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```cpp
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// C4190.cpp
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// compile with: /W1 /LD
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struct X

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4274.md‎

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The `#ident` directive, which inserts a user-specified string in the object or executable file, is deprecated. Consequently, the compiler ignores the directive.
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> [!CAUTION]
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> Warning C4274 advises you to use the [#pragma comment(exestr, 'string')](../../preprocessor/comment-c-cpp.md) directive. However, this advice is deprecated and will be revised in a future release of the compiler. If you use the `#pragma` directive, the linker tool (LINK.exe) ignores the comment record produced by the directive and issues warning [LNK4229](../../error-messages/tool-errors/linker-tools-warning-lnk4229.md). Instead of the `#ident` directive, we recommend that you use a [file version resource string](_win32_Version_Information) in your application.
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> Warning C4274 advises you to use the [#pragma comment(exestr, 'string')](../../preprocessor/comment-c-cpp.md) directive. However, this advice is deprecated and will be revised in a future release of the compiler. If you use the `#pragma` directive, the linker tool (LINK.exe) ignores the comment record produced by the directive and issues warning [LNK4229](../../error-messages/tool-errors/linker-tools-warning-lnk4229.md). Instead of the `#ident` directive, we recommend that you use a file version resource string in your application.
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### To correct this error
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## To correct this error
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- Remove the `#ident "`*string*`"` directive.
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## See Also
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[comment (C/C++)](../../preprocessor/comment-c-cpp.md)
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[Linker Tools Warning LNK4229](../../error-messages/tool-errors/linker-tools-warning-lnk4229.md)
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[Version Information](_win32_Version_Information)
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[Working with Resource Files](../../mfc/working-with-resource-files.md)

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4917.md‎

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# Compiler Warning (level 1) C4917
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'declarator' : a GUID can only be associated with a class, interface or namespace
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A user-defined structure other than [class](../../cpp/class-cpp.md), [interface](../../cpp/interface.md), or [namespace](../../misc/namespace-declaration.md) cannot have a GUID.
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A user-defined structure other than [class](../../cpp/class-cpp.md), [interface](../../cpp/interface.md), or [namespace](../../cpp/namespaces-cpp.md) cannot have a GUID.
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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This warning is off by default. See [Compiler Warnings That Are Off by Default](../../preprocessor/compiler-warnings-that-are-off-by-default.md) for more information.
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The following code sample generates C4917:
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## Example
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The following code sample generates C4917:
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```
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```cpp
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// C4917.cpp
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// compile with: /W1
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#pragma warning(default : 4917)

‎docs/error-messages/compiler-warnings/compiler-warning-level-1-c4947.md‎

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# Compiler Warning (level 1) C4947
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'type_or_member' : marked as obsolete
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A member or type was marked as obsolete with the [ObsoleteAttribute](frlrfSystemObsoleteAttributeClassTopic) class.
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A member or type was marked as obsolete with the <xref:System.ObsoleteAttribute> class.
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The following sample generates C4947:
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## Example
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The following sample generates C4947:
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```
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```cpp
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// C4947.cpp
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// compile with: /clr /W1
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// C4947 expected

‎docs/error-messages/compiler-warnings/compiler-warnings-c4200-through-c4399.md‎

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|[Compiler Warning (level 1) C4346](../../error-messages/compiler-warnings/compiler-warning-level-1-c4346.md)|'name': dependent name is not a type|
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|[Compiler Warning (level 1) C4348](../../error-messages/compiler-warnings/compiler-warning-level-1-c4348.md)|'type': redefinition of default parameter: parameter 'parameter_number'|
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|[Compiler Warning (level 1) C4350](../../error-messages/compiler-warnings/compiler-warning-level-1-c4350.md)|behavior change: 'member1' called instead of 'member2'|
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|[Compiler Warning (level 1) C4351](../Topic/Compiler%20Warning%20\(level%201\)%20C4351.md)|new behavior: elements of array 'array' will be default initialized|
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|Compiler warning (level 1) C4352|'%$I': intrinsic function already defined|
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|[Compiler Warning (level 1) C4353](../../error-messages/compiler-warnings/compiler-warning-level-1-c4353.md)|nonstandard extension used: constant 0 as function expression. Use '__noop' function intrinsic instead|
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|[Compiler Warning C4355](../../error-messages/compiler-warnings/compiler-warning-c4355.md)Compiler warning (level 1 and level 4) C4355|'this': used in base member initializer list|

‎docs/error-messages/compiler-warnings/compiler-warnings-c4400-through-c4599.md‎

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|[Compiler Warning (level 4) C4536](../../error-messages/compiler-warnings/compiler-warning-level-4-c4536.md)|'typename': type-name exceeds meta-data limit of 'character_limit' characters|
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|[Compiler Warning (level 1) C4537](../../error-messages/compiler-warnings/compiler-warning-level-1-c4537.md)|'object': '.' applied to non-UDT type|
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|[Compiler Warning (level 3) C4538](../../error-messages/compiler-warnings/compiler-warning-level-3-c4538.md)|'type': const/volatile qualifiers on this type are not supported|
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|[Compiler Warning (level 1) C4539](../Topic/Compiler%20Warning%20\(level%201\)%20C4539.md)|'character': a universal-character-name specifies an invalid character|
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|[Compiler Warning (level 1) C4540](../../error-messages/compiler-warnings/compiler-warning-level-1-c4540.md)|dynamic_cast used to convert to inaccessible or ambiguous base; run-time test will fail ('type1' to 'type2')|
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|[Compiler Warning (level 1) C4541](../../error-messages/compiler-warnings/compiler-warning-level-1-c4541.md)|'identifier' used on polymorphic type 'type' with /GR-; unpredictable behavior may result|
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|Compiler warning (level 1) C4542|Skipping generation of merged injected text file, cannot write %$M file: '%s': %$e|

‎docs/error-messages/tool-errors/linker-tools-error-lnk2005.md‎

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# Linker Tools Error LNK2005
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symbol already defined in object
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The given `symbol`, displayed in its decorated form, was multiply defined.
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For more information, see the Knowledge Base articles:
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For more information, see the Knowledge Base articles:
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- "LNK2005 Errors When Link C Run-Time Libraries Are Linked Before MFC Libraries" (Q148652)
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- [A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++](https://support.microsoft.com/kb/148652)
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- "Global Overloaded Delete Operator Causes LNK2005" (Q140440)
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- [FIX: Global Overloaded Delete Operator Causes LNK2005](https://support.microsoft.com/kb/140440)
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- "LNK2005 Errors on New and Delete When Defining _ATL_MIN_CRT" (Q184235).
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- [You receive LNK2005 errors when you compile an ATL executable (.exe) project in Visual C++](https://support.microsoft.com/kb/184235).
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You can find Knowledge Base articles on the MSDN Library CD-ROM or at [http://support.microsoft.com/search](http://support.microsoft.com/search).
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This error is followed by fatal error [LNK1169](../../error-messages/tool-errors/linker-tools-error-lnk1169.md).
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This error is followed by fatal error [LNK1169](../../error-messages/tool-errors/linker-tools-error-lnk1169.md).
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### To fix by checking the following possible causes
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- Declare the variable [static](../../cpp/storage-classes-cpp.md#static).
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- Declare the variable [selectany](../../cpp/selectany.md).
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