Installing on Ubuntu x86_64

[MangelMaxime]

Hello, I am trying to install ftlk4lua on my computer running under Ubuntu. And I god the following error :

sudo luarocks install fltk4lua
[sudo] password for shadaen: 
Installing https://luarocks.org/fltk4lua-0.1-1.src.rock...
Using https://luarocks.org/fltk4lua-0.1-1.src.rock... switching to 'build' mode
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/fltk4lua.o src/fltk4lua.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_enums.o src/f4l_enums.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_ask.o src/f4l_ask.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_image.o src/f4l_image.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_shared_image.o src/f4l_shared_image.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_widget.o src/f4l_widget.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_box.o src/f4l_box.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_button.o src/f4l_button.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_chart.o src/f4l_chart.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_clock.o src/f4l_clock.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_group.o src/f4l_group.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_browserx.o src/f4l_browserx.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_browser.o src/f4l_browser.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_file_browser.o src/f4l_file_browser.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_check_browser.o src/f4l_check_browser.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_input_choice.o src/f4l_input_choice.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_color_chooser.o src/f4l_color_chooser.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_pack.o src/f4l_pack.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_scroll.o src/f4l_scroll.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_spinner.o src/f4l_spinner.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_tabs.o src/f4l_tabs.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_tile.o src/f4l_tile.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_window.o src/f4l_window.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_wizard.o src/f4l_wizard.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_input.o src/f4l_input.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_menu.o src/f4l_menu.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_choice.o src/f4l_choice.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_menu_bar.o src/f4l_menu_bar.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_menu_button.o src/f4l_menu_button.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_progress.o src/f4l_progress.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_valuator.o src/f4l_valuator.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_adjuster.o src/f4l_adjuster.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_counter.o src/f4l_counter.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_dial.o src/f4l_dial.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_roller.o src/f4l_roller.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_slider.o src/f4l_slider.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_value_input.o src/f4l_value_input.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o src/f4l_value_output.o src/f4l_value_output.cxx
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o moon/moon.o moon/moon.c
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -c -o compat-5.3/c-api/compat-5.3.o compat-5.3/c-api/compat-5.3.c
gcc -O2 -fPIC -I/usr/include/lua5.2 -Imoon -Icompat-5.3/c-api -DMOON_PREFIX=f4lx -DCOMPAT53_PREFIX=f4lx -DNDEBUG `/usr/local/bin/fltk-config --use-images --cxxflags` -shared -o fltk4lua.so src/fltk4lua.o src/f4l_enums.o src/f4l_ask.o src/f4l_image.o src/f4l_shared_image.o src/f4l_widget.o src/f4l_box.o src/f4l_button.o src/f4l_chart.o src/f4l_clock.o src/f4l_group.o src/f4l_browserx.o src/f4l_browser.o src/f4l_file_browser.o src/f4l_check_browser.o src/f4l_input_choice.o src/f4l_color_chooser.o src/f4l_pack.o src/f4l_scroll.o src/f4l_spinner.o src/f4l_tabs.o src/f4l_tile.o src/f4l_window.o src/f4l_wizard.o src/f4l_input.o src/f4l_menu.o src/f4l_choice.o src/f4l_menu_bar.o src/f4l_menu_button.o src/f4l_progress.o src/f4l_valuator.o src/f4l_adjuster.o src/f4l_counter.o src/f4l_dial.o src/f4l_roller.o src/f4l_slider.o src/f4l_value_input.o src/f4l_value_output.o moon/moon.o compat-5.3/c-api/compat-5.3.o `/usr/local/bin/fltk-config --use-images --ldflags` -lstdc++
/usr/bin/ld: /usr/local/lib/libfltk_images.a(fl_images_core.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libfltk_images.a: error adding symbols: Bad value
collect2: error: ld returned 1 exit status
Makefile:63: recipe for target 'fltk4lua.so' failed
make: *** [fltk4lua.so] Error 1

Error: Build error: Failed building.

Here are some informations about my system.

○ → uname -a
Linux shadaen-G750JW 3.19.0-47-generic #53-Ubuntu SMP Mon Jan 18 14:02:48 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

○ → lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.04
Release:    15.04
Codename:   vivid

I have lua5.2 configure as main lua version on my computer.

Do you have any idea ?

[siffiejoe]

Yes. x86-64 requires that you compile all object files that are part of a shared library with -fPIC (or -fpic). It seems that the object files in /usr/local/lib/libfltk_images.a have been compiled without this flag. You will either have to recompile your FLTK libraries using -fPIC, or use the library files from the apt repositories.

[MangelMaxime]

Hallelujah ! ! !

Ok after one evening of try and with your help I got fltk4lua working on my ubuntu computer. (I used the compiled version as the library one seems not working for me).

I think it's probably a good idea to put the following informations inside of the wiki :
For building, FLTK on Unix 64 do :

○ →  ./configure CFLAGS="-fpic" CXXFLAGS="-fpic"
○ →  make
○ →  [sudo] make install

Please be sure to delete all previous build and pre-build data from FLTK sources and destination installation folder (ex: /usr/local/lib)

Thanks for your help @siffiejoe .

Let's start playing with fltk4lua :).
Just a quick question, is the implementation complete or there is some lack ?

[siffiejoe]

The implementation is not complete. Most simple widgets are available (see the list on the wiki). What's missing is the low-level drawing and event handling code (because you have to subclass a widget to use it), the composite widgets like Fl_Tree, Fl_Table, Fl_Text_Display (same reason), and some Forms emulation widgets (didn't see the point). The first two I will probably add some time in the future.

Regarding the -fpic issue: I will add a sentence to the relevant wiki page ...

[MangelMaxime]

Ok thanks for your answer.
But would you say that it is possible to write a simple text editor ? (Just trying to see the limit :) )

[siffiejoe]

A simple one? Sure. Just use an fl.Input widget with "FL_MULTILINE_INPUT" or "FL_MULTILINE_INPUT_WRAP"as its type. However if you need syntax highlighting or different fonts, you'd have to subclass the widget to add custom drawing and event handling (or use the Fl_Text_Editor class). Both is currently not possible in Lua.

[MangelMaxime]

Ok thanks for the answer. I will try it.

I was thinking to build one with minimal synthax highlighting so if I understand well the subclass need to be done via cpp ?
Sorry for all this questions, it's my first time using lua with a cpp binding like the one of fltk4lua.

[bogbasic]

Very helpful thread. I spent an evening trying to sort this out and I wouldn't have managed without this info, so many thanks.

As MangelMaxime says, the main things are:
Delete any FLTK .a files already in /usr/local/lib, scrub your FTLK installation folder and re-extract everything again from source.
For compiling FLTK again, use this command: ./configure CFLAGS="-fpic" CXXFLAGS="-fpic"
instead of just ./configure before the usual make and sudo make install.
For fltk4lua:
git clone --recurse-submodules https://github.com/siffiejoe/lua-fltk4lua.git (** see below)
Edit Makefile and change lines 5-6 from 5.2 to 5.3 as follows:
DLL_INSTALL_DIR = /usr/lib/lua/5.3
LUA_INCDIR = /usr/include/lua5.3
Then make and sudo make install.

** I suspect sudo luarocks install fltk4lua would have worked instead of cloning the git version.

This seems to work for me on Lubuntu 20.04 so please do put a mention on the wiki page.