Re: RFC: Feature macros (aka USE flags)

[Petr Šabata]

On Mon, Apr 27, 2020 at 3:01 PM Vít Ondruch  wrote:
> Dne 27. 04. 20 v 13:19 Petr Šabata napsal(a):
> > Based on the recent discussions around %fedora/%rhel macros and ELN,
> > and %bcond generally being confusing to work with, I came up with a
> > distribution-wide feature that defines generic feature keywords and
> > associated helper macros that packages can check in build-time
> > conditionals.
>
> The most confusing part of the %bcond is the definition itself. The rest
> is fine IMO. Therefore, I somehow don't understand why would you like to
> replace:
> %if %{with ssl}
> BuildRequires:  openssl-devel
> %endif
>
> by
> %if %{use ssl}
> BuildRequires:  openssl-devel
> %endif

The difference here is %use defaults are defined by the buildroot
while %with %bconds are defined by the package.
> Also I don't understand, why there is exposed some underscore macro,
> such as `make test %{?_use_ssl:-DSSL}`. Shouldn't the underscore macro
> be just implementation detail? For `%bcond`s, the `_with` macros are
> discouraged, so why would you encourage them?

Yes, this should be an internal detail. I'd like to replace this with
%use_defined or something similar.

P