How Do I Compile C Code Using Anonymous Structs and Unions with gcc?

Compiling C Code with Anonymous Structs / Unions

In C, anonymous structs and unions (structures and unions declared without a name) can present compilation challenges. This article addresses the issue faced when attempting to compile C code similar to the code shown in the question, which utilizes anonymous structs and unions.

To compile this type of code in C using gcc, the -fms-extensions flag must be enabled. This flag allows for the use of Microsoft extensions, which include anonymous structs and unions. By adding -fms-extensions to the compilation command, the code should compile without the reported errors.

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