From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Thu, 25 Mar 2021 16:39:42 +0100
Subject: [Buildroot] [PATCH] package/libbytesize: remove pcre2 runtime
 dependency
In-Reply-To: <c1c09133e8e3d70f0458fd0da622062f@agner.ch>
References: <226176cabe249af62546689fbb39de8a7010c329.1616681740.git.stefan@agner.ch>
 <8735wjl3d5.fsf@tarshish>
 <c1c09133e8e3d70f0458fd0da622062f@agner.ch>
Message-ID: <20210325163942.7d8ecb69@windsurf.home>
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To: buildroot@busybox.net

On Thu, 25 Mar 2021 15:40:36 +0100
Stefan Agner <stefan@agner.ch> wrote:

> Hmm, I think I don't understand how runtime/compile time dependencies
> work in buildroot.
> 
> I read this section:
> https://buildroot.org/downloads/manual/manual.html#_gettext_integration_and_interaction_with_packages
> 
> But I think i got this wrong, gettext in that case is only a runtime
> dependency.

Yes, and because it's only a runtime dependency, we need to make sure
it is enabled in the configuration (which the "select" does), but we
don't need to ensure it is built *before* a certain package (which
<pkg>_DEPENDENCIES does).

> Is there a way to have something as compile time dependency but not a
> runtime dependency?

No, because it is fairly uncommon to have something that is a compile
time dependency but not necessary at runtime. Do you have specific
examples in mind ?

For example, in your patch, libbytesize links against the libpcre2
library. So there is a build time dependency, as libpcre2 needs to be
built before libbytesize, for the link of libbytesize to succeed. But
there is also a runtime dependency: libpcre2.so needs to be on the
target.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com