Re: [PATCH] configure.ac: Fix FIONREAD check to work with gcc-14 on Solaris

[Stefan Kangas <stefankangas@gmail.com>]

Alan Coopersmith <alan.coopersmith@oracle.com> writes:

> Before this fix, it would fail to build with gcc-14 with the error:
> conftest.c: In function 'main':
> conftest.c:265:11: error: implicit declaration of function 'ioctl'
>  [-Wimplicit-function-declaration]
>   265 | int foo = ioctl (0, FIONREAD, &foo);
>       |           ^~~~~
>
> Solaris documents ioctl() as being defined in <unistd.h>
> ---
>  configure.ac | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/configure.ac b/configure.ac
> index 8a5ba7db3d1..947c2827b8e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -7117,6 +7117,9 @@ AC_DEFUN
>  			    #ifdef USG5_4
>  			    # include <sys/filio.h>
>  			    #endif
> +			    #ifdef HAVE_UNISTD_H
> +			    # include <unistd.h> /* defines ioctl() on Solaris */
> +			    #endif
>  			  ]],
>  			  [[int foo = ioctl (0, FIONREAD, &foo);]])],
>  	 [emacs_cv_usable_FIONREAD=yes],
> --
> 2.45.2

I guess this should be installed on emacs-30.  Eli, WDYT?