[QGIS-Developer] QGIS 3.8.0 on FreeBSD: build takes several hours

[Nyall Dawson]

On Mon, 24 Jun 2019 at 20:48, Rainer Hurling <rhurlin at gwdg.de> wrote:
>
> Hi Nyall,
>
> Am 24.06.19 um 01:33 schrieb Nyall Dawson:
> > On Sat, 22 Jun 2019 at 16:55, Rainer Hurling <rhurlin at gwdg.de> wrote:
> >>
> >> As the maintainer of the QGIS port for FreeBSD, I am preparing a port
> >> for the recent update to QGIS 3.8.0.
> >>
> >>
> >> This seems to happen since #18fb3f2 [1] (committed 2019-05-13, submitted
> >> 2019-04-30). Before the commit, the build process takes a normal
> >> duration on FreeBSD.
> >>
> >> As far as I can say, the problem occurs with both proj-5.1.0 and
> >> proj-6.1.0. GDAL version is 2.4.1, the OS is FreeBSD 13-0 CURRENT amd64.
> >>
> >
> > Hmm - perplexing. Most of that commit should be ifdefed out for proj <
> > 6 builds. I wonder if you tried trimming the contents of
> > qgscoordinatereferencesystem_legacy.h to just a couple of sample lines
> > as a test? Maybe there's something in the compiler which doesn't like
> > the large static QMap...
> >
> > Nyall
> >
>
> Many thanks for your response.
>
> After trimming the contents of qgscoordinatereferencesystem_legacy.h
> (about 10 lines left), it builds in a normal time again.
>
> So it is likely, that the problem on FreeBSD has something to do with
> its compiler suite? I am using FreeBSD clang version 8.0.1
> (branches/release_80 363030) (based on LLVM 8.0.1).
>
> Is there any workaround, which lets me use the whole contents again?

You could try swapping the QMap for a std::unordered_map and see if
there's any benefit.

Nyall