[Fedora-packaging] When to use a leading underscore?

[indent man]

You can take a look at top comment in /usr/lib/rpm/macros
Not sure what it means, however :)

Cheers


On Fri, Aug 31, 2012 at 11:33 PM, Björn Persson
<bjorn at xn--rombobjrn-67a.se>wrote:

> As maintainer of fedora-gnat-project-common I sometimes work on RPM macros
> for
> use in Ada packages. Every time I define a new macro I have trouble
> deciding
> whether its name should begin with an underscore or not. I know that there
> is
> some technical difference but I've never quite understood what practical
> difference it makes.
>
> I've been trying to imitate macros with a similar function, so I defined
> _GNAT_project_dir with a leading underscore in analogy with _libdir and
> others. Macros containing command line flags for build tools I've defined
> without a leading underscore in analogy with optflags, but then there are
> _smp_mflags and the hardening macros which have the underscore, and
> __global_cflags and __global_ldflags even have two leading underscores.
>
> Could someone explain what difference a leading underscore makes and give
> some
> guidance on when I should use it?
>
> Is a double leading underscore functionally different from a single one,
> or is
> that just some kind of naming convention?
>
> Björn Persson
>
> --
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> packaging at lists.fedoraproject.org
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