Mostly blazed the trail for standardizing the non-standard parts of the C Sometimes you had to use a vendor-specific compiler like Microsoft's, but GCC Than K&R does! Technically speaking, it's impossible to write a portableĬ program consisting of less than one source file, since the compiler canīe standards compliant while searching for header files anywhere it cares to.Īlthough Apple seems to have nudged the world in the direction of LLVM, forĭecades, GCC was the de facto standard for C compilation until very recently. The standard actually says less about where to look for header files The named source file is searched for in an implementation-defined manner. Source file identified by the specified sequence between the " delimiters. In section 6.10.2, "Source file inclusion", states:Ĭauses the replacement of that directive by the entire contents of the What does the standard say about header file inclusion? K&R was published in 1978, but C was standardized by ANSI in 1983.
Otherwise, the search should be "implementation-defined". In thisĬase, the compiler should (typically) look for the header in the same directory as the
Of the header file in double quotes, e.g. While not an official standard, K&R suggested two different ways toĬompiler where to look for a header file. Was found if it is not found there, or if the name is enclosed in, seaching follows an implementation-defined rule to find the file. Is quoted, searching for the file typically begins where the source program Is replaced by the contents of the file filename. The strange-lookingĬonstruct in listings 1 and 2 compile and work correctly: The contents of another file in the current one. Include-ing a header file in a C program actually means copying You can't even read a file or write to the When writing embedded apps - but practically, you're going to probably Technically speaking, you can write a complete and useful C program withoutĮver creating or referring to a header file - this is actually feasible
That describe how to invoke that functionality from other source files. Partly by convention and partly by design, C programs are split into sourceįiles that describe the functionality of the program itself and header files Where does GCC Look to Find its Header Files? Where Does GCC Look to Find its Header Files?
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