[vtkusers] OpenGL errors on Cygwin

[Bill Lorensen]

David,

I just built with BUILD_SHARED=OFF and did not have any problems.

To summarize,
with BUILD_SHARED=ON I had to check in a fix to netcdf, then build went fine
with BUILD_SHARED=OFF it built with no problems.

I'm not sure what the difference is between your system and mine. Did
you muck with any CMake variables?

Bill

On Wed, Sep 8, 2010 at 9:44 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> I am getting these linker errors when compiling the latest git version
> in Cygwin (in Windows 7).
>
> ../../../bin/libvtkRendering.a(vtkXOpenGLRenderWindow.cxx.o):vtkXOpenGLRenderWindow.cxx:(.text+0x41f5):
> undefined reference to `_glXDestroyContext'
> (many more _glXSOMETHING errors)
>
> I have ALL of the cygwin packages installed, so I don't think it is a
> missing package problem.
>
> Here is the relevant make output with VERBOSE=1:
>
> /usr/bin/c++.exe     -Wno-deprecated -mwin32
> CMakeFiles/GraphicsCxxTests.dir/GraphicsCxxTests.cxx.o
> (more .o files...)
> CMakeFiles/GraphicsCxxTests.dir/TestDecimatePolylineFilter.cxx.o  -o
> ../../../bin/GraphicsCxxTests.exe
> -Wl,--out-implib,../../../bin/libGraphicsCxxTests.dll.a
> -Wl,--major-image-version,0,--minor-image-version,0
> ../../../bin/libvtkRendering.a ../../../bin/libvtkIO.a
> ../../../bin/libvtkDICOMParser.a ../../../bin/libvtkNetCDF_cxx.a
> ../../../bin/libvtkNetCDF.a ../../../bin/libvtkmetaio.a -lcomctl32
> ../../../bin/libvtksqlite.a ../../../bin/libvtkpng.a
> ../../../bin/libvtktiff.a ../../../bin/libvtkzlib.a
> ../../../bin/libvtkjpeg.a ../../../bin/libvtkexpat.a -lvfw32
> ../../../bin/libvtkGraphics.a ../../../bin/libvtkverdict.a
> ../../../bin/libvtkImaging.a ../../../bin/libvtkFiltering.a
> ../../../bin/libvtkCommon.a ../../../bin/libvtksys.a -lws2_32 -lm
> -lpthread -lwsock32 -lgdi32 ../../../bin/libvtkftgl.a
> ../../../bin/libvtkfreetype.a /usr/lib/w32api/libopengl32.a -lXt -lSM
> -lICE -lX11 -lXext
>
> I've been talking with the Cygwin people for the last couple of days.
> Here are the highlights:
>
> 1) "These symbols are provided by libGL, but you'll notice that
> libvtkftgl.a comes after that on the command line you are using."
>
> 2) "you should not be linking with /usr/lib/w32api/libopengl32.a"
>
> 3) "comctl32, vfw32, gdi32, wsock32, ws2_32 also seem unlikely to be right."
>
> Anyone have any thoughts on this?
>
> David
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