[gdal-dev] Undefined reference with GDAL and netCDF support

[henry wasker]

Hello,

I try to use a simple test program which must use GDAL and netcdf support.
This test is for constraints and specifications. Here's this code (main.cpp)

#include "gdal_priv.h"
#include "netcdfdataset.h"

using namespace std;

int main() {

   netCDFDataset child;

}


For this, I have built GDAL (1.9.2) and netcdf (netcdf-c-4.3.2).

I have made 2 choices, firstly I built GDAL with the following option for
./configure :

./configure --prefix=/usr/local/gdal_without_ncdf/ --with-netcdf=no

After copying *netcdfdataset.h* and *netcdfdataset.cpp* in the current
directory ( from *~/gdal-1.9.2/frmts/netcdf/netcdfdataset.h* .) and once
*libgdal.so* and *libnetcdf.so*  are built, I compile *the above
main.cpp*with the following Makefile :

# Makefile for test_gdal

CPP = g++
DIR_GDAL = /usr/local/gdal_without_netcdf
DIR_NETCDF = /usr/local/netcdf-gcc
INCLUDES = -I. -I$(DIR_GDAL)/include
LDFLAGS = -L$(DIR_GDAL)/lib -lgdal -L$(DIR_NETCDF)/lib -lnetcdf
RM = rm -f

all: test_gdal

test_gdal: main.o netcdfdataset.o
    $(CPP) -o $@ $^ $(LDFLAGS)

%.o:%.cpp
    $(CPP) -o $@ -c $< $(INCLUDES)

clean:
    $(RM) test_gdal *.o

Everything compiles fine for this case.

But now, I tried another option, installing GDAL with a standard way :

./configure --prefix=/usr/local/gdal_standard_install/

I have noticed that "netcdf" is set to "yes" after this ./configure

So, I copied only netcdfdataset.h (without netcdfdata.cpp) in the current
directory for the "#include" of main.cpp and I compile with the following
script :

#!/bin/bash

GDAL_HOME=/usr/local/gdal_standard_install

g++ -I$GDAL_HOME/include -I. -c main.cpp
g++ -L$GDAL_HOME/lib -lgdal main.o -o test_gdal

Unfortunately, this compilation works fine only on *Debian/wheezy*. On *RedHat
6*, I have the following error :

main.cpp:(.text+0x73): undefined reference to
`netCDFDataset::~netCDFDataset()'
main.cpp:(.text+0x8c): undefined reference to
`netCDFDataset::~netCDFDataset()'

I don't understand why I have this error ; However, on *RedHat 6*, *the
symbol netCDFDataset* appears well with :

$ nm -C /usr/local/gdal_standard_install/lib/libgdal.so | grep -i
netcdfdataset

...
00000000003fac70 T netCDFDataset::netCDFDataset()
00000000003fac70 T netCDFDataset::netCDFDataset()
0000000000405d00 T netCDFDataset::~netCDFDataset()
0000000000405b90 T netCDFDataset::~netCDFDataset()
0000000000405b90 T netCDFDataset::~netCDFDataset()
...

If someone could see what's wrong

Thanks
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