How to compile QGIS from source with Grass?

Question

I recently decided to reinstall QGIS and build against the latest version of GDAL - something I have been putting off for ages because I suspected it would be a nightmare. Lo and behold it has been, so after a full-day of trying to get this to compile following these: instructions I'm reaching out for some help.

I successfully built GDAL 2.0 this morning (at least I think it was successful gdalinfo --version is now showing GDAL 2.0.0, released 2015/06/14 and have been working my way through the instructions above.

I'm currently stuck at 47% with make failing here:

[ 47%] Built target qgis.d.rast7
Linking C executable ../../../../output/lib/qgis/grass/modules/qgis.g.info7
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRGetLinearUnits@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRExportToWkt@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRGetAttrValue@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `SetCSVFilenameHook@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRExportToProj4@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRMorphFromESRI@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRExportToPrettyWkt@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRMorphToESRI@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRImportFromProj4@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRDestroySpatialReference@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `VSIFree@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRIsProjected@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRNewSpatialReference@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRIsGeographic@GDAL_1.8'
/usr/lib/grass70/lib/libgrass_gproj.so: undefined reference to `OSRGetUTMZone@GDAL_1.8'
collect2: error: ld returned 1 exit status
make[2]: *** [output/lib/qgis/grass/modules/qgis.g.info7] Error 1
make[1]: *** [src/providers/grass/7/CMakeFiles/qgis.g.info7.dir/all] Error 2
make: *** [all] Error 2

I'm not quite sure what this means - though some searching suggests I may still have an old install of GDAL lurking, though not sure I can find it - as I removed a couple earlier when make failed much earlier on.

I thought it could be something to do with Grass 7 which I installed following these enter link description here instructions. But I've also tried to compile with GRASS_PREFIX7 set to OFF in ccmake. But make fails at the same place.

p.s. using: Ubuntu 14.04 GRASS7 GDAL 2.0

Answer 1

If you build gdal yourself, you should also build grass yourself.

Using grass binaries which are linked against a different version of gdal than QGIS is certainly a very bad idea.

Answer 2

I had the same issue. It was related to the flags in cmake. My purpose was not related to GRASS 7 so I just had to desactivate it.

My line for compiling is similar to below (I didn't provide all the options just the ones related to GRASS)

cmake -DWITH_GRASS=OFF -DWITH_GRASS7=OFF ..

You need to do before a

make clean

You can also check if your configuration related to GRASS is effective looking at generated file CMakeCache.txt. It should contain something like below:

...
//Determines whether GRASS 6 plugin should be built
WITH_GRASS:BOOL=OFF

//Determines whether GRASS 7 plugin should be built
WITH_GRASS7:BOOL=OFF
...