[QGIS-Developer] A new way to build QGIS and all its dependencies from scratch in Linux and MacOS

[sinan bulut]

Hi all.

I am a volunteer contributor for the software project [Spack](
https://github.com/spack), an HPC package manager. Using this tool, it is
possible to build QGIS and all of its direct and indirect dependencies from
scratch using a single line of command as shown below. I thought this might
be useful to some, especially to QGIS developers, and accordingly it might
be considered to be added to the list of QGIS build/installation methods.

Once Spack is setup like:

    $ git clone https://github.com/spack/spack.git
    $ source spack/share/spack/setup-env.sh

One can build QGIS and all its dependencies via a single line of command
like

    $ spack install qgis

In practice, one might need to issue a command involving some hints for
dependency resolution:

    $ spack install qgis ^gdal at 2.4.2 ^libgeotiff at 1.4.3 ^py-pyproj at 1.9.6
^netcdf-c+mpi ^mesa~llvm

This will not be necessary in the upcoming releases of Spack.

Once it is built, one can use the package like

    $ spack find qgis
    ==> 7 installed packages
    -- linux-centos7-skylake / gcc at 7.4.0 ----------------------------
    qgis at 3.8.1  qgis at 3.10.3  qgis at 3.10.3  qgis at 3.10.3  qgis at 3.10.4

    -- linux-centos7-x86_64 / gcc at 8.2.0 -----------------------------
    qgis at 3.8.1  qgis at 3.8.1

    $ spack load qgis at 3.10.4

    $ which qgis

/mnt/local/spack/opt/spack/linux-centos7-skylake/gcc-7.4.0/qgis-3.10.4-hc7uhdochwjmx4v2dzy2zzewit2vr2ov/bin/qgis

Hope this will be useful to some.

Sinan
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