Differences between running an executable with Visual Studio debugger vs without debugger

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Windows Heap behaves differently if process is started under the debugger. To disable this behavior (in order to find a problem while debugging) add _NO_DEBUG_HEAP=1 to environment (like in this question).

Alternatively you can attach to process early in program execution. Heap will not enter the debug mode then. Add DebugBreak() line somewhere in the beginning of the execution, run with Ctrl+F5, and start debugging when asked to.

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