[vtk-developers] CMake fails with build type "None" on Ubuntu 18.04

[Ben Boeckel]

On Fri, Jan 11, 2019 at 22:39:21 +0100, Elvis Stansvik wrote:
> Den fre 11 jan. 2019 kl 22:33 skrev Elvis Stansvik
> > Hm, I realized I accidentally enabled testing when updating the flags.
> > When I corrected it to -DVTK_BUILD_TESTING=OFF, the CMake got much
> > further. Strange...

`VTK_BUILD_TESTING=ON` says "build all testing" and some module's tests
require IOParallel. But, IOParallel is gated by `VTK_USE_MPI` and
forcefully disabled without it, so it errors saying a required module
needs a module not allowed to build. There is also
`VTK_BUILD_TESTING=WANT` which builds as much testing as it can without
the disabled modules. In the long run, making these things
`TEST_OPTIONAL_DEPENDS` instead and skipping the relevant individual
tests is better.

> > Anyway, I'll probably get this working now.
> 
> The golden line for me:
> 
> cmake \
>     -DCMAKE_INSTALL_PREFIX=/home/estan/orexplore/VTK-inst \
>     -DCMAKE_INSTALL_RPATH=/home/estan/orexplore/VTK-inst/lib \
>     -DVTK_GROUP_ENABLE_Qt=YES \
>     -DVTK_GROUP_ENABLE_Imaging=YES \
>     -DVTK_GROUP_ENABLE_Views=YES \
>     -DVTK_MODULE_ENABLE_VTK_RenderingFreeTypeFontConfig=YES \
>     -DVTK_BUILD_TESTING=OFF \
>     -DVTK_USE_EXTERNAL=YES \
>     -DVTK_MODULE_USE_EXTERNAL_VTK_gl2ps=OFF \
>     -DVTK_MODULE_USE_EXTERNAL_VTK_libharu=OFF \
>     -DCMAKE_BUILD_TYPE=None \
>     ../VTK
> 
> I had made a bunch of mistakes earlier. This line worked fine, and
> gl2ps and libharu were the only ones I needed to use the internal ones
> (due to slightly too old versions in Ubuntu 18.04).

These two are actually patched for API changes and have pending PRs for
them (mentioned in the CMake code), so upstream releases aren't ready
anyways.

--Ben