[vtk-developers] Repeated calls to find_package(VTK COMPONENTS ...)

[Marcus D. Hanwell]

Hi,

Moving this discussion from
http://review.source.kitware.com/#/c/16703/ to the mailing list. As I
was saying I do not see precisely what you see, the repeated calls
seem to work for me locally. I would not expect the call without
COMPONENTS to work, and am not sure we should support calling with and
without COMPONENTS.

I have a minimal CMake script,

cmake_minimum_required(VERSION 3.0)

find_package(VTK COMPONENTS vtkChartsCore)
message(STATUS "LIBS: ${VTK_LIBRARIES}")

find_package(VTK COMPONENTS vtkCommonCore)
message(STATUS "LIBS: ${VTK_LIBRARIES}")

find_package(VTK COMPONENTS vtkCommonMath)
message(STATUS "LIBS: ${VTK_LIBRARIES}")

find_package(VTK COMPONENTS vtkChartsCore)
message(STATUS "LIBS: ${VTK_LIBRARIES}")

find_package(VTK)
message(STATUS "LIBS: ${VTK_LIBRARIES}")

This results in the output,

$ cmake -DVTK_DIR:PATH=/home/marcus/build/VTK .
-- The C compiler identification is GNU 4.9.1
-- The CXX compiler identification is GNU 4.9.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- LIBS: vtkChartsCore;vtkCommonColor;vtkCommonDataModel;vtkCommonMath;vtkCommonCore;vtksys;vtkCommonMisc;vtkCommonSystem;vtkCommonTransforms;vtkInfovisCore;vtkFiltersExtraction;vtkCommonExecutionModel;vtkFiltersCore;vtkFiltersGeneral;vtkCommonComputationalGeometry;vtkFiltersStatistics;vtkImagingFourier;vtkImagingCore;vtkalglib;vtkRenderingContext2D;vtkRenderingCore;vtkFiltersGeometry;vtkFiltersSources;vtkRenderingFreeType;vtkfreetype;vtkzlib;vtkftgl
-- LIBS: vtkCommonCore;vtksys
-- LIBS: vtkCommonMath;vtkCommonCore;vtksys
-- LIBS: vtkChartsCore;vtkCommonColor;vtkCommonDataModel;vtkCommonMath;vtkCommonCore;vtksys;vtkCommonMisc;vtkCommonSystem;vtkCommonTransforms;vtkInfovisCore;vtkFiltersExtraction;vtkCommonExecutionModel;vtkFiltersCore;vtkFiltersGeneral;vtkCommonComputationalGeometry;vtkFiltersStatistics;vtkImagingFourier;vtkImagingCore;vtkalglib;vtkRenderingContext2D;vtkRenderingCore;vtkFiltersGeometry;vtkFiltersSources;vtkRenderingFreeType;vtkfreetype;vtkzlib;vtkftgl
-- LIBS: vtkChartsCore;vtkCommonColor;vtkCommonDataModel;vtkCommonMath;vtkCommonCore;vtksys;vtkCommonMisc;vtkCommonSystem;vtkCommonTransforms;vtkInfovisCore;vtkFiltersExtraction;vtkCommonExecutionModel;vtkFiltersCore;vtkFiltersGeneral;vtkCommonComputationalGeometry;vtkFiltersStatistics;vtkImagingFourier;vtkImagingCore;vtkalglib;vtkRenderingContext2D;vtkRenderingCore;vtkFiltersGeometry;vtkFiltersSources;vtkRenderingFreeType;vtkfreetype;vtkzlib;vtkftgl
-- Configuring done
-- Generating done
-- Build files have been written to: /home/marcus/build/vtkcomponents

As far as I can see this gives the libraries one would expect, i.e.
vtkChartsCore, vtkCommonCore, vtkCommonMath, vtkChartsCore, and the
final one is incorrect but I am not sure of the value in supporting
mixed COMPONENTS and non-components versions of find_package.

Let me know if there is something I am missing, is this possibly with
an older version of VTK (I am testing with master).

Marcus