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Only source files are passed to the compiler (to preprocess and compile it). Header files aren't passed to the compiler. Instead, they are included from source files.

Header files serve two purposes. System header files declare the interfaces to parts of the operating system. You include them in your program to supply the definitions and declarations you need to invoke system calls and libraries.

GCC is licensed under the GNU General Public License version 3. The GCC runtime exception permits compilation of proprietary programs (in addition to free software) with GCC. This does not impact the license terms of GCC source code.

Header files are not compiled directly, Instead, header files are included into other source files via #include . In fact, when you invoke a C/C++ compiler, before the “real” compiler starts, it runs a pre-processor whose job is to handle the special instructions that begin with # .

Every C++ program needs at least one header file to be meaningful. For example, most C++ programs need the cin object to take input from the user and much other pre-written code, which helps to make programming easier, so to use such functionalities, you need a header file.

3.2. Customizing Copyright License Headers We first navigate to Preferences -> General -> Copyright. Then, to add a new copyright header, we click on the Add button. To modify an existing license, we select a license from the Licenses and then click on the Modify button.

You don't need to compile header files. It doesn't actually do anything, so there's no point in trying to run it. However, it is a great way to check for typos and mistakes and bugs, so it'll be easier later.

h files are indeed typical C-style header files (as opposed to being something completely different that just happens to be named with . h extension), then no, there's no reason to "compile" these header files independently.