Why Does SDL Use a `main` Macro, and What Are the Implications?

Understanding SDL's Main Macro

When encountering issues with SDL setup, it's common to stumble upon the surprising presence of the main macro. This macro replaces the typical main function definition, leading to compilation errors if the main function lacks the argc and argv parameters.

Why the Main Macro?

The SDL library requires initialization before running user code. To ensure this, SDL defines its own main function that performs this initialization. By replacing the original main function with SDL_main, SDL retains the ability to perform its initialization before executing the user's code.

Redefining main

While it's possible to undefine main and use it conventionally, doing so can have consequences. SDL redirects standard output and error to files. If main is undefined, this behavior ceases.

Additional Implications

If the need arises to use WinMain() instead of main(), refer to the SDL source code to determine the correct initialization steps required within WinMain() for SDL to function properly.

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