Re: when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?

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To: Song Du <sdu@xxxxxxxxxxx>
Subject: Re: when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?
From: Ian Lance Taylor <iant@xxxxxxxxxx>
Date: Tue, 18 May 2010 17:48:14 -0700
Cc: Andi Hellmund <mail@xxxxxxxxxxxxxxxx>, "gcc-help\@gcc.gnu.org" <gcc-help@xxxxxxxxxxx>
In-reply-to: <ED64882F200EF5419CDAC2E6B5C4B3A207456E4C2C@xxxxxxxxxxxxxxxxxxxxx> (Song Du's message of "Tue\, 18 May 2010 17\:32\:20 -0700")
References: <ED64882F200EF5419CDAC2E6B5C4B3A207455F4483@xxxxxxxxxxxxxxxxxxxxx> <mcr8w7he126.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <ED64882F200EF5419CDAC2E6B5C4B3A207456E4C2C@xxxxxxxxxxxxxxxxxxxxx>
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Song Du <sdu@xxxxxxxxxxx> writes:

> Curious question: why to search /usr/local/include before
> /usr/include? And what is the original intention to have /usr and
> /usr/local both, rather than just /usr?

Historically the OS vendor controlled /usr and /usr/include, while
system owners installed their own libraries in /usr/local/include.

Ian

Follow-Ups:
- Re: when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?
  - From: Tim Prince

References:
- when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?
  - From: Song Du
- Re: when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?
  - From: Ian Lance Taylor
- RE: when GCC searches the system include directories, "/usr/include" first, or "usr/lib/gcc/include", "usr/local/lib/gcc/include" first?
  - From: Song Du

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