Re: [libgpiod] help with GPIOSET_INTERACTIVE

[Kent Gibson <warthog618@gmail.com>]

On Fri, Dec 29, 2023 at 03:14:04AM -0600, Seamus de Mora wrote:
> I'm trying to add the 'GPIOSET_INTERACTIVE' definition to 'gpioset.c':
> I've installed 'libeditline-dev' and 'libedit-dev' via apt; each
> separately, and then both
>

Please prefix emails related to libgpiod with [libgpiod], as noted in
the CONTRIBUTING section of the README, so your mail is more likely to
be recognized by the appropriate people.

You don't specify your platform and what you've done to get this far -
you provide the output you are seeing but not the inputs.
It is apparently a Pi, but the distro and version would be helpful,
as well as the build commands themselves.

Have you read the BUILDING section of the README?
How are you performing the build? I would expect autoconf to choke
if it can't find the required headers before it even gets to the actual
compile step.

This works for me on a Pi, both bullseye and bookworm:

$ ./autogen.sh --enable-tools --enable-gpioset-interactive
$ make

That results in tools being built in the tools directory, and the
built gpioset supports the -i option.

That is with the following packages installed:
 autoconf
 autoconf-archive
 libtool
 m4
 libedit-dev

Cheers,
Kent.

> With 'libeditline-dev' alone I am getting the compile error:
> gpioset.c:16:10: fatal error: editline/readline.h: No such file or directory
>    16 | #include <editline/readline.h>
>       |          ^~~~~~~~~~~~~~~~~~~~~
>
> With 'libedit-dev' alone (or both), I get these errors:
> /usr/bin/ld: gpioset.o: in function `tab_completion':
> /home/pi/libgpiod-2.1/tools/gpioset.c:732: undefined reference to
> `rl_completion_matches'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:713: undefined
> reference to `rl_completion_matches'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:725: undefined
> reference to `rl_completion_matches'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:725: undefined
> reference to `rl_attempted_completion_over'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:725: undefined
> reference to `rl_completion_type'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:725: undefined
> reference to `rl_completion_append_character'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:725: undefined
> reference to `rl_line_buffer'
> /usr/bin/ld: gpioset.o: in function `complete_line_id':
> /home/pi/libgpiod-2.1/tools/gpioset.c:642: undefined reference to
> `rl_line_buffer'
> /usr/bin/ld: gpioset.o: in function `interact':
> /home/pi/libgpiod-2.1/tools/gpioset.c:748: undefined reference to
> `stifle_history'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:769: undefined
> reference to `readline'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:853: undefined
> reference to `history_list'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:855: undefined
> reference to `add_history'
> /usr/bin/ld: gpioset.o: in function `print_line_values':
> /home/pi/libgpiod-2.1/tools/gpioset.c:484: undefined reference to
> `rl_attempted_completion_function'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:484: undefined
> reference to `rl_basic_word_break_characters'
> /usr/bin/ld: /home/pi/libgpiod-2.1/tools/gpioset.c:484: undefined
> reference to `history_length'
> collect2: error: ld returned 1 exit status
> make: *** [Makefile:513: gpioset] Error 1
>
> Can someone explain how to add GPIOSET_INTERACTIVE & compile successfully?