How can I include additional header files during compilation from the command line using GCC?

Compiling with Additional Header Files from Command Line

Adding extra header files during compilation can enhance code functionality. For C projects, GCC 4 provides the -include option to include additional header files from the command line.

To use this option, specify the header files as follows:

gcc -include file1.h -include file2.h ... main.cpp

The -include option processes the specified files as if they were included at the beginning of the main source file. However, the search for the header files begins in the preprocessor's working directory instead of the directory containing the main source file.

For example, to include the vector and math.h headers from the command line:

gcc -include <vector> -include <math.h> main.cpp

This option provides an efficient way to include additional header files without manually modifying the code, especially when working with large code bases that lack necessary includes.

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