Message: 4
Date: Wed, 10 Dec 2008 07:39:04 +0100
From: Ralf Wildenhues <[EMAIL PROTECTED]>
Subject: Re: GNU Make Extensions
To: Tom Browder <[EMAIL PROTECTED]>
Cc: automake@gnu.org
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
Hello Tom,
* 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 Makefile.am'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.
Cheers,
Ralf
One caveat is that there are a few += specific issues in Automake 1.6
that can cause the operator to fail during reconf. If you have a +=
in a conditional section, you'll get an error along the lines of
"CCFILES was already defined in condition TRUE, which implies
condition SOME_CONDITION". In that situation, you have to either
upgrade Automake or stick to the line-continuations.
Fortunately, Mac OS X 10.4 is one of the remaining (common)
configurations still stuck on the ancient 1.6 version. Prior to
10.5, a couple of the autotools were actually managed as part of the
"core" OS that isn't allowed to change between major versions. (See
thread on the apple dev mailing list for details.) It was finally
decoupled with 10.5, though, so it's no longer an issue.
Cheers!
Sean
