[vtk-developers] Issue with Linux extra linker flags

[Joachim Pouderoux]

For information I have created a merge request to fix the issue:
https://gitlab.kitware.com/vtk/vtk/merge_requests/424

Joachim

*Joachim Pouderoux*

*PhD, Technical Expert*
*Kitware SAS <http://www.kitware.fr>*


2015-07-10 11:42 GMT+02:00 Joachim Pouderoux <joachim.pouderoux at kitware.com>
:

> Hi,
>
> I have issues when compiling VTK in release mode with gcc 4.9.2
>
> Linking CXX shared library ../../lib/libvtkFiltersParallelMPI-6.3.so
> CMakeFiles/vtkFiltersParallelMPI.dir/vtkDistributedDataFilter.cxx.o: In
> function
> `vtkDistributedDataFilter::AddConstantUnsignedCharPointArray(vtkUnstructuredGrid*,
> char const*, unsigned char)':
> vtkDistributedDataFilter.cxx:(.text+0x2a03): warning: memset used with
> constant zero length parameter; this could be due to transposed parameters
> collect2: error: ld returned 1 exit status
> Filters/ParallelMPI/CMakeFiles/vtkFiltersParallelMPI.dir/build.make:214:
> recipe for target 'lib/libvtkFiltersParallelMPI-6.3.so.1' failed
> make[2]: *** [lib/libvtkFiltersParallelMPI-6.3.so.1] Error 1
>
> This warning is due to a gcc bug that exists in many versions and the
> error arises because a linker option is automatically added by VTK on linux
> : "-Wl,--fatal-warnings" (see vtkCompilerExtras.cmake:15).
>
> Several users had the same issues and propose different fixes:
>   see https://github.com/Kitware/VTK/pull/7
> or
>
> https://github.com/gentoo/gentoo-portage-rsync-mirror/blob/master/sci-visualization/paraview/files/paraview-4.1.0-no-fatal-warnings.patch
>
> I prefer the second patch that consists in removing this --fatal-warnings
> options. I do not understand why this is performed automatically and cannot
> be disabled.
> Any objection in removing this linker flag by default?
>
> Best,
>
> *Joachim Pouderoux*
>
> *PhD, Technical Expert*
> *Kitware SAS <http://www.kitware.fr>*
>
>
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