-fPIC flag is not working, JNI problem

p6majo

I try to link the fftw3f library to a java project within the standard JNI framework.

A Java test program runs successfully. The library is found.
I can make a call the native function:

fftwf_malloc

However, as soon as I make a call to the native functions:

fftwf_plan_dft_r2c_2d

and

fftwf_execute(plan)

the linking of the dynamic library fails with the following error message:

/usr/bin/ld: //usr/local/lib/libfftw3f.a(assert.o): relocation R_X86_64_PC32 against symbol `stdout@@GLIBC_2.2.5' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status

I use the following command to create the object files:

g++ -m64 -Wall -fPIC -shared -c -I./.. -Itarget/custom-javah -I/usr/lib/jvm/java-8-oracle/jre/../include -I/usr/lib/jvm/java-8-oracle/jre/../include/linux -otarget/objs/convolutionWrapper.o -c ../convolutionWrapper.cpp -lfftw3f -lm

and the following command to create the library:

g++ -o target/lib/libnativeConvolution.so -fPIC -shared target/objs/convolutionWrapper.o  -lfftw3f -lm -lc

I tried various positions of the flags and also omitted the libraries while creating the object files.

Any help is appreciated.

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p6majo

The fftw library had to be recompiled using the flag --enable-shared.

./configure --enable-shared
make
sudo make install