Re: Possible regressions with trunk autoconf (vs 2.71)

[Frederic Berat]

Thanks, I'll update the bug I opened for them.

On Thu, Nov 17, 2022 at 6:54 PM Zack Weinberg <zack@owlfolio.org> wrote:

> On 2022-11-17 9:30 AM, Zack Weinberg wrote:
> > Or even better, get rid of the AC_EGREP_CPP at the same time
> >
> >   AC_CACHE_CHECK([whether we need to define $1], ac_var,
> >       [AC_PREPROC_IFELSE([[#ifndef $1
> >   #error not defined
> >   #endif]],
> >       [AS_VAR_SET(ac_var,yes)],[AS_VAR_SET(ac_var,no)])])
>
> Correction, this should have been
>
>     AC_CACHE_CHECK([whether we need to define $1], ac_var,
>         [AC_PREPROC_IFELSE([[#ifndef $1
>     #error not defined
>     #endif]],
>         [AS_VAR_SET(ac_var,no)],
>         [AS_VAR_SET(ac_var,yes)])])
>
> Converting it to AC_PREPROC_IFELSE inverts the sense of the "then" and
> "else" clauses.
>
> zw
>
>