Re: Recent clang warns on rl_message()

[Chet Ramey]

On 6/4/23 9:52 AM, 林宏雄 wrote:

> clang-14 (and later) warns on rl_message().
>
> $ cat rl_message_warn.c
> #include <stdio.h>
> #include "readline/readline.h"
> void test() {
>      rl_message("hello");
> }
> $ cc -c -I$HOME/opt/include rl_message_warn.c
> rl_message_warn.c:4:15: warning: passing arguments to 'rl_message' without 
> a prototype is deprecated in all versions of C and is not supported in C2x 
> [-Wdeprecated-non-prototype]
>      rl_message("hello");

The first answer to this is that I changed bash and readline to be (mostly)
C23 conformant starting in December, 2022, so this isn't going to be a
problem moving forward.

Part of the rationale for finally doing that was to avoid problems like this.

For now, you can sidestep the issue by arranging for HAVE_STDARG_H to be
defined before including readline.h, perhaps on the cc/gcc command line.

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/