The `-DNDEBUG` flag is a compiler option that defines the `NDEBUG` preprocessor macro. This macro is commonly used in C++ programs to conditionally compile code that performs assertion checks, allowing you to disable these checks in production builds for improved performance.

To use the `-DNDEBUG` flag in your g++ compilation process, you can add it as a command-line argument when invoking the compiler. For example, if you have a source file `example.cpp` that includes the `assert` header, you can compile it with the following command:

```
g++ -DNDEBUG example.cpp -o example
```

The `-DNDEBUG` flag defines the `NDEBUG` macro, which disables the assertion checks in the `assert` header. The resulting executable will not include these checks, which can improve its performance.

Note that the `-DNDEBUG` flag should only be used in production builds where performance is critical, and not during development and testing where assertion checks are important for catching bugs and ensuring program correctness.
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