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My build structure looks like this
src: many *.cpp *.h pairs
build: library containing compiled versions of everything in src
apps: a few .cpp files, each containing a main function. Uses library in build, cairo, and gsl.
My system
Operating System: Linux Mint 20.1
Kernel: Linux 5.4.0-77-generic
Architecture: x86-64
cmake install of fltk
cmake -G"Unix Makefiles" -DOPTION_CAIRO:BOOL=ON -D CMAKE_BUILD_TYPE=Debug ..
Everything seems to be fine until linking one of the programs in apps. The stderr output follows. One curious thing is the ".cxx.o" extension. Suggestions much appreciated.
/usr/bin/ld: /usr/local/lib/libfltk_images.a(Fl_JPEG_Image.cxx.o): in function `jpeg_mem_src(jpeg_decompress_struct*, unsigned char const*)':
/home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:198: undefined reference to `jpeg_resync_to_restart'
/usr/bin/ld: /usr/local/lib/libfltk_images.a(Fl_JPEG_Image.cxx.o): in function `Fl_JPEG_Image::load_jpg_(char const*, char const*, unsigned char const*)':
/home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:253: undefined reference to `jpeg_std_error'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:273: undefined reference to `jpeg_finish_decompress'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:275: undefined reference to `jpeg_destroy_decompress'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:298: undefined reference to `jpeg_CreateDecompress'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:300: undefined reference to `jpeg_stdio_src'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:304: undefined reference to `jpeg_read_header'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:311: undefined reference to `jpeg_calc_output_dimensions'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:321: undefined reference to `jpeg_start_decompress'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:327: undefined reference to `jpeg_read_scanlines'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:330: undefined reference to `jpeg_finish_decompress'
/usr/bin/ld: /home/david/fltk-repository/fltk/src/Fl_JPEG_Image.cxx:331: undefined reference to `jpeg_destroy_decompress'
collect2: error: ld returned 1 exit status
make: *** [Makefile:53: apps/ui] Error 1
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