Re: trying to solve some missing symbols during linking (porting to Plan9)

[Chet Ramey]

On 10/10/24 5:38 AM, Jens Staal wrote:
> Dear all,
>
> I am currently trying to compile Bash on Plan9 (9front) using APExp (a
> GNU/posix compatibility environment). I have all the bash object files
> and libraries compiled and I only get one weird issue during linking:
>
> chdir: BC: not defined
> chdir: PC: not defined
> chdir: UP: not defined
>
> grepping the libraries shows that chdir is in libbuiltins.a
> and that should correspond to builtins/cd.def

I think the `chdir' is a red herring.

Those are termcap/terminfo library symbols. As Branden says in his
reply, bash usually resolves those from the ncurses or terminfo
libraries. Does your posix environment have those?

The configuration process looks for a bunch of different curses/
termcap/terminfo libraries, and writes the ones it uses to the
TERMCAP_LIB and TERMCAP_DEP Makefile variables. What are those set to?

These variables are declared extern in ncurses.h/termcap.h, and historical
versions of the termcap library, including the ancient version in
lib/termcap in the bash distribution, declare them as library symbols.
The readline library expects this, so it can set the variables
accordingly. Maybe you have a version of the library that doesn't have
them as library symbols?

If you don't have curses/ncurses/terminfo, you have a couple of options.
You can compile bash without readline and line editing support by
running `configure --disable-readline'. If you want to modify the source,
you can add

char *BC;
char *UP;
char PC;

to shell.c and see if that works. But if you don't have any termcap or
ncurses library, the first option is probably the best one.

Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

OpenPGP_signature.asc
Description: OpenPGP digital signature