Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Fri, 1 Mar 2013 19:33:18 +0100

Am Freitag, 1. März 2013, 17:50:41 schrieben Sie:
> On 2013-03-01 Benjamin Franksen wrote:
> > On Thursday, February 28, 2013 11:22:06 Andrew Johnson wrote:
> > > We get around that in Base now by always generating files into the
> > > O.<arch> directory and moving them into O.Common afterwards.  A move is
> > > an atomic operation in the file-system, so it doesn't matter if there
> > > is a race because the generated files *should* be identical.
> >
> > But won't this mean that architecture independent targets (db files,dbd
> > files,operator panels, etc.) will all be built several times (once for
> > each target architecture)?
>
> In general no, although there can be times when they get built more than
> once (hence the protection we had to add, see previous email).  The main
> reason is that we have a dependency in place so that no cross-builds can
> start until after the host build has completed.  Those files will usually
> be built and installed as part of the host build, so make will see them as
> already up to date when it later checks them for each of the cross-build
> targets.

Thanks, I was not aware of this. Since when is this the case (i.e. only in
3.15 or is it in 3.14.12, too)?

And: will this same dependency (CROSS builds depend on HOST build to be
complete) not also ensure that all architecture independent targets are
already up-to-date when the CROSS build starts, so generating them directly
inside $(COMMON_DIR) is not done multiple times in parallel? (Assuming, of
course, that the rules are written to avoid accidental parallelism due to
multiple targets in a non-pattern rule, as I explained in a previous message).

Cheers
--
Ben Franksen
()  ascii ribbon campaign - against html e-mail
/\  www.asciiribbon.org   - against proprietary attachments

________________________________

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH

Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.

Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv. Vorsitzende Dr. Beatrix Vierkorn-Rudolph
Geschäftsführung: Prof. Dr. Anke Rita Kaysser-Pyzalla, Thomas Frederking

Sitz Berlin, AG Charlottenburg, 89 HRB 5583

Postadresse:
Hahn-Meitner-Platz 1
D-14109 Berlin

http://www.helmholtz-berlin.de

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System