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doc: Mention Kiselyov's work on "staging".

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* doc/guix.texi (G-Expressions): Mention Oleg's work on "staging" in
  footnote.
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Ludovic Courtès 2014-05-08 21:50:53 +02:00
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@ -1995,10 +1995,14 @@ build the derivations; they are run by the daemon in a container
It should come as no surprise that we like to write those build actions
in Scheme. When we do that, we end up with two @dfn{strata} of Scheme
code@footnote{The term @dfn{stratum} in this context was coined by
Manuel Serrano et al.@: in the context of their work on Hop.}: the
``host code''---code that defines packages, talks to the daemon,
etc.---and the ``build code''---code that actually performs build
actions, such as making directories, invoking @command{make}, etc.
Manuel Serrano et al.@: in the context of their work on Hop. Oleg
Kiselyov, who has written insightful
@url{http://okmij.org/ftp/meta-programming/#meta-scheme, essays and code
on this topic}, refers to this kind of code generation as
@dfn{staging}.}: the ``host code''---code that defines packages, talks
to the daemon, etc.---and the ``build code''---code that actually
performs build actions, such as making directories, invoking
@command{make}, etc.
To describe a derivation and its build actions, one typically needs to
embed build code inside host code. It boils down to manipulating build