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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: style question - includes
Date: Sat, 30 Sep 2017 15:36:41 -0700
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supercat@casperkitty.com writes:
> On Saturday, September 30, 2017 at 2:25:25 PM UTC-5, james...@verizon.net wrote:
>> However, there are some things that you can say portably: the places that are
>> searched fall into three categories (some of which might be empty):
>> A. those that are searched only by #include ""
>> B. Those that are searched by #include<>, and also during the first search done
>> by #include "".
>> C. Those that are searched by #include<>, but are only searched by #include ""
>> during it's second search.
>
> By my understanding, an implementation would allow an implementation
> to process e.g. #include <stdio.h> by defining a bunch of macros and
> outputting an intrinsic to define a bunch of identifiers.

Right.  N1570 6.10.2 says that #include <...> searches for a *header*,
while #include "..." searches for a *source file* (and falls back to the
<...> search).  I don't think the standard defines what a "header" is,
which means it can be anything that acts like an includable source file.

[...]

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"