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Re: pattern rules

From: Ralf Hemmecke
Subject: Re: pattern rules
Date: Mon, 31 Mar 2008 09:53:42 +0200
User-agent: Thunderbird (X11/20080213)

On 03/27/2008 06:21 PM, Ralf Wildenhues wrote:
* Ralf Hemmecke wrote on Thu, Mar 27, 2008 at 01:31:36PM CET:
    Output warnings falling in category. category can be one of:
        portability issues (e.g., use of make features that are
        known to be not portable)

---END quote

It is not so clear what this relates to. Is it only related to the 'make' program or also some portability issues outside of it?

Hmm, the documentation doesn't specify this well.  Currently, most
issues which are warned about revolve around 'make' issues.  But there
are also a couple of others:
- that you may need AM_PROG_CC_C_O if '-c -o' is used in build rules,
- that directory names like 'aux' or 'obj' are not portable.

Thank you for making this clearer. And yes it is exacly what I feared. I would still like to be warned about "aux" and "obj" if I want to use gnu make.

In other words, can I simply say "no-portability" and don't relax
strictness in places not related to GNU make features?

What you can do is use -Wno-portability only for those files
for which you need it, by enabling it in those files only:
  AUTOMAKE_OPTIONS = ... -Wno-portability

Do I understand correctly, that I simply exclude -Wno-portability from AM_INIT_AUTOMAKE and rather put a line with AUTOMAKE_OPTIONS in any where I use pattern rules?

So there are two items where Automake could be improved here:
- document exactly the semantics of which options are applied
  (when they are passed in more than one place: on the automake command
  line, in AM_INIT_AUTOMAKE, and in per-file AUTOMAKE_OPTIONS),
- document which portability issues are warned about with -Wportability,
  or possibly even split this into separate categories.

Discussions and patches welcome.

Please don't expect too much from me. I am just a beginner and not a developer. I am only starting to learn about Automake's features.

In addition, I want to use Automake for something that actually doesn't fit very well (if at all) into Automake's view of the world. But, maybe I should open up a new thread.


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