Re: Adding <alloca.h> ?

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

Le jeu. 13 mai 2021 à 21:44, Joerg Sonnenberger <joerg%bec.de@localhost> a écrit :
> > No we don't, unless you are using PCC :D
> >
> > The block in <stdlib.h> only provides an alloca(3) prototype, and only
> > if the compiler already #defines alloca as __builtin_alloca.
> >
> > While this works for gcc in some -std modes (e.g. gnu++14), it does
> > not in others (c++14, c++11).
>
> Your analysis is wrong. We don't provide a prototype in standard modes
> as that violates the user request. The prototype is enough to trigger
> the builtin logic in GCC and Clang.

Allright.

Anyway, would it be wrong to add <alloca.h> which unconditionally
makes alloca() use the builtin, similar to what e.g. glibc (Linux) and
FreeBSD do, or is it fundamentally wrong doing so?

Jaromir