Re: [fltk.general] Re: Font problem with new build - Forums

On 4/16/24 05:52 TwoTrees Innerworld wrote:

OK, partial joy.

I installed all the updates and fltk-1.4.x

The test program runs and displays fonts correctly and with different point sizes.

Good, you made progress.

The new problem is that now my Netbeans project won't successfully build anymore.

The modules seem to compile fine, but I get a ton of what I believe are linker errors.

It starts like this...

g++ -I/usr/local/include -L/usr/local/lib -lwiringPi -o dist/Debug/GNU-Linux/fltk build/Debug/GNU-Linux/a_to_d.o build/Debug/GNU-Linux/distance.o build/Debug/GNU-Linux/getdisljump.o build/Debug/GNU-Linux/getdisnew.o build/Debug/GNU-Linux/kbhit.o build/Debug/GNU-Linux/main.o build/Debug/GNU-Linux/menu.o build/Debug/GNU-Linux/parallel.o build/Debug/GNU-Linux/serial.o -L/usr/local/lib -Wl,-rpath,'/usr/local/lib' -lfltk -lfltk_forms -lfltk_images -lpthread -ldl -lm -lX11 -lwiringPi -lXext -lstdc++

Note: above is your buld /linker commandline. You are obviously linking in three FLTK libs: '-lfltk -lfltk_forms -lfltk_images'. See below...

[...]
Fl_Xlib_Graphics_Driver_font_xft.cxx:(.text._ZN23Fl_Xlib_Graphics_Driver9set_fontsEPKc+0x1c): undefined reference to `FcInit'
/usr/bin/ld: Fl_Xlib_Graphics_Driver_font_xft.cxx:(.text._ZN23Fl_Xlib_Graphics_Driver9set_fontsEPKc+0x2c): undefined reference to `FcPatternCreate'
/usr/bin/ld: Fl_Xlib_Graphics_Driver_font_xft.cxx:(.text._ZN23Fl_Xlib_Graphics_Driver9set_fontsEPKc+0x40): undefined reference to `FcObjectSetBuild'
/usr/bin/ld: Fl_Xlib_Graphics_Driver_font_xft.cxx:(.text._ZN23Fl_Xlib_Graphics_Driver9set_fontsEPKc+0x54): undefined reference to `FcFontList'

[...]

The lines above show undefined references, i.e. a missing library.
As Mohammed wrote: you need to add the fontconfig library to your linker commandline or any linker options in netbeans. Either the full string "-lfontconfig" or only the library name 'fontconfig' - wherever you added the FLTK libs and maybe other libs in Netbeans. I don't know where this may be, something like linker options or additional link libraries etc.

Do you know what happened? Did something move?

Not sure, we need some more info.

Most important: did you run `sudo make install` after your FLTK build completed? The default would be to *install* the built libraries and header files in '/usr/local' where your Netbeans project expects them: '-I/usr/local/include -L/usr/local/lib' etc.. If you did not, then please do it now - otherwise your Netbeans project would have to be changed to refer to the FLTK build directory which is possible but more complicated for now. If you did run `sudo make install` then you can skip this.

Next step: adding the fontconfig library to your build command may or may not resolve all issues, there may well be more libs required. If it works you're done, if not, continue:

That's what `fltk-config` is good for: a "simple" approach is to build a working FLTK test program with fltk-config, like this:

$ flltk-config --use-images --use-forms --compile /path/to/fltk/test/hello.cxx

Replace /path/to/fltk with the path to your FLTK source files. Note that I added '--use-images --use-forms' so you link with the same FLTK libs as your Netbeans project.

This command outputs the full compile and linker command to build the hello demo. Look for any libs that are missing from your Netbeans linker command, and add them as well, maybe step by step, until your build works.

Another - shorter - command would have been:

$ flltk-config --use-images --use-forms --ldstaticflags

which outputs only the required linker flags. On my Raspi I get, for instance (but please use your output!):

-lfltk_images -lpng -lz -lfltk_jpeg -lfltk_forms -lfltk -lXrender -lXft -lfontconfig -pthread -lpthread -ldl -lm -lX11

Once you added all required libs to your Netbeans project this should work as well.

Thanks again for all the help!

You're welcome.

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