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Re: Dynamic package version numbers with Autoconf and Automake

From: Robert Boehne
Subject: Re: Dynamic package version numbers with Autoconf and Automake
Date: Wed, 15 Aug 2012 11:58:46 -0500
User-agent: Mozilla/5.0 (X11; SunOS i86pc; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 08/15/12 08:45, Bob Friesenhahn wrote:
On Wed, 15 Aug 2012, Miles Bader wrote:

(3) The final version info is updated (using VCS info and/or autoconf
   version info) at make time using a script, and when it changes,
   only causes a source file (e.g., version.c) to change.

   This means that although some things are rebuilt after a commit
   (version.o, and relinking of any binaries that use it), the amount
   of rebuilding is relatively minor while still yielding accurate

Likewise, GraphicsMagick configures a "version.h" as well as a version file used for non-autotools builds under Windows. With the currently used mechanism, only the few files depending on version.h need to be rebuilt but the whole project relinks.

If the project "config.h" was to be re-generated (seems to be necessary with new AC_INIT), then all of the source modules would need to be recompiled and relinked since everything depends on the configuration header.


I've had a similar complaint when using Autotest. In my project, the test suite depends on an M4 input file that has the project version encoded in it.
 cat test_suite/package.m4
# Signature of the current package.
m4_define([AT_PACKAGE_NAME],  [my_server])
m4_define([AT_PACKAGE_TARNAME],  [my_server])
m4_define([AT_PACKAGE_MINOR_VERSION], 4.18)
m4_define([AT_PACKAGE_VERSION],  [4.18.5])
m4_define([AT_PACKAGE_STRING],  [my_server 4.18.5])

Which is created by a makefile rule as suggested in the autoconf documentation:

So when I change the version of the package, I autoreconf, then make then autoreconf again.

Scenario #2 -

I have inherited a library versioning scheme that doesn't play nice with Libtool (an absolute requirement)
when the Automake name is not encoded with the version -


So every time I change the version argument to AC_INIT, I have to search around my makefiles for anything
that references each library and make the same changes there.

So I would be very interested in a solution to these issues.



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