Hi Kent, I'll take a stab at this.
On 11/13/2012 01:04 PM, Kent A. Reed wrote:
> I've had a long-standing issue with building multiple configurations of
> LinuxCNC using sources from the git repositories which has come to a
> head with Michael's single codebase.
Funny, me too!
> What's an economical way to build multiple configurations side-by-side,
> e.g., for Michael's code, ./configure --with-threads options rtai,
> xenomai-user, xenomai-kernel, rt-preempt-user, rt-preempt-kernel?
I'm not doing this exactly, but building RPMs requires this kind of kung-fu.
If you specify a --prefix argument to ./configure, it will install
LinuxCNC where you ask it to, but the directory structure may not be
what you intend. For example, ./configure --prefix=~/emc2-xeno-user
will, I expect, put things in ~/emc2-xeno-user/bin,
~/emc2-xeno-user/lib, etc. There are ways to further control those
locations with args like '--bindir' and '--libdir'. Try ./configure --help.
This also may not be what you intend because you won't really have
multiple configurations side-by-side. You'll still have to run
./configure; make; make install when you've been working on xeno-user
and decide to switch to rtai.
(In the olden days before 'distros' came to be and disk and CPU were
still scarce, many open-source packages' makefiles contained a variable
to specify a separate build directory so you could keep one copy of the
source but build object files for multiple architectures in another
place. I believe LinuxCNC does not have such a thing.)
John
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