You can take a look at top comment in /usr/lib/rpm/macros<div>Not sure what it means, however :)</div><div><br></div><div>Cheers</div><div><br></div><div><br><div class="gmail_quote">On Fri, Aug 31, 2012 at 11:33 PM, Björn Persson <span dir="ltr">&lt;<a href="mailto:bjorn@xn--rombobjrn-67a.se" target="_blank">bjorn@xn--rombobjrn-67a.se</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">As maintainer of fedora-gnat-project-common I sometimes work on RPM macros for<br>
use in Ada packages. Every time I define a new macro I have trouble deciding<br>
whether its name should begin with an underscore or not. I know that there is<br>
some technical difference but I&#39;ve never quite understood what practical<br>
difference it makes.<br>
<br>
I&#39;ve been trying to imitate macros with a similar function, so I defined<br>
_GNAT_project_dir with a leading underscore in analogy with _libdir and<br>
others. Macros containing command line flags for build tools I&#39;ve defined<br>
without a leading underscore in analogy with optflags, but then there are<br>
_smp_mflags and the hardening macros which have the underscore, and<br>
__global_cflags and __global_ldflags even have two leading underscores.<br>
<br>
Could someone explain what difference a leading underscore makes and give some<br>
guidance on when I should use it?<br>
<br>
Is a double leading underscore functionally different from a single one, or is<br>
that just some kind of naming convention?<br>
<br>
Björn Persson<br>
<br>
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