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Re: minor error and a question

From: Peter Johansson
Subject: Re: minor error and a question
Date: Wed, 30 Nov 2011 22:21:46 -0500
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv: Gecko/20110920 Thunderbird/3.1.15

On 11/30/11 11:11 AM, Joakim Tjernlund wrote:
Question: "make install" always install all targets, even if some of then 
haven't been rebuilt
since last install. Is it possible to have some dependency sensitive install so 
only rebuilt
targets are reinstalled?
Hi Jocke,

In one of my projects I have the following snippet in top

# like the normal install target, but does not update header files
# (and their time stamps) if the content did not change.
    $(MAKE) install $(AM_MAKEFLAGS) INSTALL_HEADER="$(install_sh_DATA) -C"

It's useful when installing frequently and wanna avoid recompilations in downstream projects, but note that the install takes a bit longer time since it needs to compare all files to decide whether it should be copied instead.

It would be faster to use the time-stamp to make that decision but when I looked into it, it seemed dangerous. Unfortunately, I cannot remember the details from top of my head.


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