How can I include header files via command line options with GCC?

Including Header Files through Command Line Option with GCC

In order to simplify the compilation process for a large code base missing header file inclusions, it is possible to specify additional header files to include using the command line option in GCC 4 and C . The -include option allows users to include specific header files as if they were part of the primary source file.

By using the -include option, the specified header files are processed as if the "#include "file"" directive appeared at the beginning of the primary source file. However, the search order for the header file differs slightly. The preprocessor's working directory is searched first, followed by the usual "#include ..."" search chain if the file is not found.

The order in which the header files are included is determined by the order in which they appear on the command line. This allows users to control the inclusion order and ensure that necessary headers are included before dependent headers.

To use the -include option, simply add the following syntax to the GCC command:

-include file1.h -include file2.h ...

Replace "file1.h", "file2.h", etc. with the names of the header files you want to include. By utilizing this option, users can conveniently add missing header file inclusions without manually modifying the code, saving time and effort.

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