On 24/05/2023 20:38, M L wrote:
std::locale = generator(lngCode + ".WINDOWS-1252"); // this line crashes

->
0x0000005
EnterCriticalSection
Boost Version: (boost_1_60_0)
Visual Studio 2013

I'm assuming that's a typo and you meant 0xC000005, which is an access violation. Typically this means that something wasn't initialized properly.

Boost 1.60 is ancient history; you should consider upgrading.

-  the problem is project dependent. Same code works in a different project.
- the problem only appears if a specific header is included, but
nothing in this header is ever executed before the crash. Removing the
header/cpp removes the problem.
- some C code is present in the code
-  the problem even appears when moving the snipped in main.

Since you've narrowed the trigger down to a particular header, you can try narrowing it further by commenting in/out things in that header. Or post a full compilable MCVE if you want help.

But the most likely problem is that you have an ODR violation -- some of your code is being compiled with different settings than others, which causes incompatible compiler output. The most common culprit for this sort of thing is incompatible #pragma pack or #define settings, but there are other possibilities.

In particular you should not include external headers under the influence of a non-default pack setting (whether via #pragma or project/file settings) -- if you must use a different value then keep it to as narrow a scope as possible.

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