Re: include paths - is there a defacto standard?

From:

James Kanze <james.kanze@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Wed, 07 Nov 2007 01:53:02 -0800

Message-ID:

<1194429182.394257.111950@57g2000hsv.googlegroups.com>

On Nov 7, 12:03 am, Ben Pfaff <b...@cs.stanford.edu> wrote:

James Kanze <james.ka...@gmail.com> writes:

I might add that when generating dependencies, g++ has an option
to only consider the files included by "..." in the generated
dependencies.

I believe that you are mistaken, for recent versions of GCC.
From the GCC 4.1 manual:

`-MM'
     Like `-M' but do not mention header files that are found in system
     header directories, nor header files that are included, directly
     or indirectly, from such a header.

     This implies that the choice of angle brackets or double quotes in
     an `#include' directive does not in itself determine whether that
     header will appear in `-MM' dependency output. This is a slight
     change in semantics from GCC versions 3.0 and earlier.

So it would seem. I was looking at two different versions of
g++ when I wrote this: the latest, but also 2.95.3 (trying to
find the option to add a directory to the path only for <...>,
which I thought was there at one time), and apparently got
confused about them.

IMHO, this is a step backwards, since it no longer allows the
project to define what it considers "system". In addition to
the standard headers, for example, we use Posix, Sybase and
Reuteurs (and maybe some other stuff I'm not aware of).
Conceptually, they're all "system" for us, and it would be
preferable not to consider them when generating dependencies.
Presumable, g++ doesn't consider the Posix headers (which are in
/usr/include), but would consider the Sybase and Reuteurs
headers (which are all somewhere under /tools in our
systems)---and if the installation installed the Sybase and
Reuteurs headers under /usr/include, g++ would act differently.
(What about /usr/local/include? I have the impression that a
lot of Linux system software installs its headers there. And a
lot of Linux non-system software installs them under
/usr/include.)

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