Bug#945041: openfoam: severe build time regression

[Kurt Kremitzki]

On Thursday, December 19, 2019 12:11:33 AM CST Adrian Bunk wrote:
> On Mon, Nov 18, 2019 at 10:17:10PM +0100, Julien Cristau wrote:
> > Source: openfoam
> > Version: 1906+dfsg1-1
> > Severity: serious
> > 
> > Hi,
> > 
> > Looking at https://buildd.debian.org/status/logs.php?pkg=openfoam the
> > build time for your package increased unreasonably in this version.
> >
> >...
> 
> Something seems to be going wrong around parallel building,
> when trying locally only one core gets used now.
> 

Indeed, although the build logs state e.g. 'Compiling enabled on 4 cores', 
only 1 core is ever used. However exporting the variables defined in debian/
rules and following the same build steps in a shell results in a build which 
does actually use the number of cores it reports, so I wasn't sure where to 
proceed with troubleshooting it beyond that. I mentioned the issue to my 
upstream contact as well who wasn't sure either given that it behaves as 
expected in a shell but not in the build environment.

> cu
> Adrian