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Re: GNU Make Extensions

From: Bob Friesenhahn
Subject: Re: GNU Make Extensions
Date: Wed, 10 Dec 2008 09:04:23 -0600 (CST)

On Wed, 10 Dec 2008, Tom Browder wrote:
* Tom Browder wrote on Wed, Dec 10, 2008 at 01:38:53AM CET:
Is it "legal" to use the "+=" operator in lieu of "\" when listing
members of a variable in's?

Yes.  In this case, an Automake extension over portable make syntax,
i.e., automake will flatten the += and 'make' won't ever see it.

I didn't really trust += in my own Automake makefiles since it was not really clear to me in what order the appending would occur and since I am also using Automake includes, the ordering might get changed in some bad way if the include order is changed. So for my makefiles I used additional variables with explicit concatenation, leaving nothing to chance.

Bob Friesenhahn
GraphicsMagick Maintainer,

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