[Paraview] mysterious linker error for custom library in custom PV Plugin

[Christine Corbett Moran]

I have a problem with building/linking to an external library I've called
libfio. The library builds, and I can link programs against it from the
command line. However my final plugin always comes up with a "ld: symbol(s)
not found". I have several other libraries which are linked against just
fine in my plugin, it is only this one which creates a problem.

I'm on OS X 10.6, using gcc version 4.2.1 (Apple Inc. build 5664). I have
tried building it both as a shared and static library, from both CMake and
externally (then linking from within CMake). I have several other libraries
I rely on which function perfectly well under any of the previous setups:
{shared,static} x {built within plugin cmake, built externally} x {c,cxx}.
 However with this set of .c files I always get a linking error, and it's
the same for any of the previous permutations. Under any configuration I'm
able to link against it from the command line. That is to say for the
example for a shared library built within the PV plugin CMake: libfio.dylib
is created within my build directory ParaViz_build, and doing e.g.  gcc
grafic2csv.c -lfio
-L/Users/corbett/Documents/Projects/pvaddons/ParaViz/ParaViz_build/  -o
grafic2csv has no linking errors, where grafic2csv contains the identical
code which later offends the linker within my plugin (see below for sample).

Example make output for a shared library built within the PV Plugin CMake:
...
[ 11%] Built target TipsyHelpers
[ 13%] Building C object CMakeFiles/fio.dir/fio/fio.c.o
[ 14%] Building C object CMakeFiles/fio.dir/fio/romberg.c.o
Linking C shared library libfio.dylib
[ 14%] Built target fio
[ 16%] Building C object CMakeFiles/SQLitelib.dir/sqlitelib/sqlite3.c.o
Linking C static library libSQLitelib.a
[ 16%] Built target SQLitelib
..
[ 98%] Building CXX object
CMakeFiles/AstroVizPlugin.dir/AstroVizPlugin_Plugin.cxx.o
[100%] Building CXX object
CMakeFiles/AstroVizPlugin.dir/moc_AstroVizPlugin_Plugin.cxx.o
Linking CXX shared library libAstroVizPlugin.dylib
Undefined symbols:
  "fioOpen(char const*, double, double)", referenced from:
      vtkGraficReader::RequestData(vtkInformation*, vtkInformationVector**,
vtkInformationVector*)in vtkGraficReader.cxx.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [libAstroVizPlugin.dylib] Error 1
make[1]: *** [CMakeFiles/AstroVizPlugin.dir/all] Error 2
make: *** [all] Error 2



Example CMake for building a static library with the PV Plugin CMake:

ADD_LIBRARY(
fio
STATIC
fio/fio.c
fio/romberg.c
)
SET_TARGET_PROPERTIES(fio PROPERTIES LINKER_LANGUAGE C)
SET_TARGET_PROPERTIES(fio PROPERTIES COMPILE_FLAGS "-fPIC")

TARGET_LINK_LIBRARIES(
AstroVizPlugin
fio
TipsyHelpers
SQLitelib
)
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