[Dune] Using Ninja with CMake

[Christoph Grüninger]

Hi there,
during last week's PDESoft coding days, encouraged by talks 
with
the deal.II guys and their large savings using ninja-build [1]
instead of make, I gave it a try.

1. With one line commented out to disable Fortran which is 
unsupported
    by ninja and a modified dunecontrol call all modules 
worked as expected.
2. There are savings compared to plain make in the range of 10 
% to 25 %.
    These are mainly the result of parallel building and the 
lead is
    melting away compared to make -j. Only for larger modules 
like DuMuX
    a make which does actually no building is 15 s compared to 
0.008 s.

I documented how to use ninja in the Dune user wiki [2].

Bye
Christoph

[1] http://martine.github.io/ninja/
[2] 
http://users.dune-project.org/projects/main-wiki/wiki/Using_cmake_to_build_your_DUNE_project#Replace-make-by-ninja-build

-- 
Das Kommt darauf an, in welchen Zeiträumen du
rechnest. Für Geologen: ja, in naher Zukunft
[Stefan Seyfried in suse-laptop]