fftw_init_threads problem

[rechardchen123]

Hi, guys,
Thanks for providing this useful repo for fast marching. Unfortunately, when I compile the code, there are some mistakes as follows:

CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- Examples are being built and installed.
OpenCV Found
-- Configuring done
-- Generating done
-- Build files have been written to: /home/chenjiusi/Documents/fast_methods/build
Consolidate compiler generated dependencies of target fast_methods
[ 40%] Built target fast_methods
Consolidate compiler generated dependencies of target fm_benchmark
Consolidate compiler generated dependencies of target full_example
Consolidate compiler generated dependencies of target test_fm
[ 60%] Linking CXX executable full_example
[ 60%] Linking CXX executable test_fm
[ 70%] Linking CXX executable fm_benchmark
/usr/bin/ld: CMakeFiles/test_fm.dir/test_fm.cpp.o: in function _GLOBAL__sub_I_main': test_fm.cpp:(.text.startup+0x3f): undefined reference to fftw_init_threads'
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/test_fm.dir/build.make:174: examples/test_fm] Error 1
/usr/bin/ld: CMakeFiles/full_example.dir/full_example.cpp.o: in function _GLOBAL__sub_I_main': full_example.cpp:(.text.startup+0x3f): undefined reference to fftw_init_threads'
collect2: error: ld returned 1 exit status
make[1]: *** [CMakeFiles/Makefile2:209: examples/CMakeFiles/test_fm.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
make[2]: *** [examples/CMakeFiles/full_example.dir/build.make:174: examples/full_example] Error 1
make[1]: *** [CMakeFiles/Makefile2:183: examples/CMakeFiles/full_example.dir/all] Error 2
/usr/bin/ld: CMakeFiles/fm_benchmark.dir/src/benchmark/fm_benchmark.cpp.o: in function _GLOBAL__sub_I_main': fm_benchmark.cpp:(.text.startup+0x3f): undefined reference to fftw_init_threads'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/fm_benchmark.dir/build.make:174: fm_benchmark] Error 1
make[1]: *** [CMakeFiles/Makefile2:131: CMakeFiles/fm_benchmark.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

[jvgomez]

Hey, sorry to hear the problems. We haven't maintained the library for a while, and this seems definitely a new issue.
Is https://stackoverflow.com/questions/60450095/undefined-reference-to-fftw-init-threads-while-installing-phash-library helping somehow?

[rechardchen123]

Hey, sorry to hear the problems. We haven't maintained the library for a while, and this seems definitely a new issue. Is https://stackoverflow.com/questions/60450095/undefined-reference-to-fftw-init-threads-while-installing-phash-library helping somehow?

Hi, Author,
I have fixed this problem. I cannot locate this problem and I guess that is the CImg package compatible problem. I use the simplest way to comment on the 'fftw-init-threads' in the header file 'CImg.h'. The compilation is successful and all examples run ok. I suppose that any other persons may be interested in these questions and reply to them. Thanks again for your providing this package.

[jvgomez]

That is great to hear! Would you mind putting up a pull request? So that other people know exactly what to do. Thank you!