Path: ...!news.mixmin.net!news2.arglkargh.de!news.karotte.org!news.space.net!news.muc.de!.POSTED.news.muc.de!not-for-mail
From: Alan Mackenzie <acm@muc.de>
Newsgroups: comp.lang.c
Subject: What are GCC's "Standard system directories" on GNU/Linux?
Date: Wed, 5 Feb 2025 11:38:44 -0000 (UTC)
Organization: muc.de e.V.
Message-ID: <vnvik4$2qqi$1@news.muc.de>
Injection-Date: Wed, 5 Feb 2025 11:38:44 -0000 (UTC)
Injection-Info: news.muc.de; posting-host="news.muc.de:2001:608:1000::2";
	logging-data="93010"; mail-complaints-to="news-admin@muc.de"
User-Agent: tin/2.6.4-20241224 ("Helmsdale") (FreeBSD/14.2-RELEASE-p1 (amd64))
Bytes: 1444
Lines: 22

Hello, comp.lang.c.

In the GCC manual, section 3.16 "Options for Directory Search" partially
describes where, how, and in what order GCC finds #include files when
compiling.

It's the "partially" bit which is getting on my nerves.  The manual
section contains a priority list for finding #include files, but the
fifth item just vaguely states:

    5. Standard system directories are scanned.

..  Which directories are these?  Where is this documented?

I'm not stupid, I know vaguely what the purpose of these directories is.
But I need to know precisely which directories they are.

GCC was built mainly for the GNU project.  Why must the manual be so
vague on this point, even for GNU/Linux?

-- 
Alan Mackenzie (Nuremberg, Germany).