Error C3821 in xlocale in c++/clr

Best Solution

Solution by Pierre Chevalier · Dec 13, 2017 at 10:40 AM

For anyone reading and looking for a workaround, a way to make sure that the STL headers are not included in unmanaged sections of managed code is to explicitly include them before the #pragma unmanaged or #pragma managed(push, off) line. You may then rely on their header guards for preventing their content from actually being included.

For instance:

#pragma unmanaged
#include <string>
#pragma managed

would fail.

But

#include <string> // This one is fine: including header in managed section of the code
          // The macros (_MANAGED, _M_CEE, ...) are consistent
#pragma unmanaged
#include <string> // This one does nothing. Yay, header guards!
#pragma managed

would workaround the issue.

I found that this was the "least change" approach to getting my large code base to compile with 15.5.x

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Solution by Blair Wang [MSFT] · Jan 10, 2018 at 01:25 AM

This issue has been fixed and is now available in our latest update. You can download the update via the in-product notification or from here: https://www.visualstudio.com/vs/ Thanks to everyone who provided feedback, votes and solutions for this problem.

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Solution by Ferdinand Oeinck · Dec 12, 2017 at 03:35 PM

[Oeps, no solution... More problems]

I removed #include <string> out of the #pragma unmanaged to resolve xlocale problem.

But my project generates a 'partially trusted application' see: https://msdn.microsoft.com/en-us/library/ms235238.aspx

So I link with ptrustm.lib in stead of msvcmrt.lib, which leads then to these linker errors:

error LNK2028: unresolved token (0A0008A6) "void __clrcall eh vector destructor iterator'(void *,unsigned int,unsigned int,void (__clrcall*)(void *))" (??_M@$$FYMXPAXIIP6MX0@Z@Z) referenced in function "public: virtual void * __thiscall std::exception::vector deleting destructor'(unsigned int)" (??Eexception@std@@$$FUAEPAXI@Z)
1>ManagedGrids.obj : error LNK2019: unresolved external symbol "void _clrcall eh vector destructor iterator'(void *,unsigned int,unsigned int,void (__clrcall*)(void *))" (??_M@$$FYMXPAXIIP6MX0@Z@Z) referenced in function "public: virtual void * __thiscall std::exception::vector deleting destructor'(unsigned int)" (??_Eexception@std@@$$FUAEPAXI@Z)

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