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doc: Give another example use of 'propagated-inputs'.

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Suggested by Leo Famulari <leo@famulari.name>.

* doc/guix.texi (package Reference): Explain 'propagated-inputs' for
non-C languages.
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Ludovic Courtès 2015-12-15 12:00:39 +01:00
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@ -2305,9 +2305,16 @@ belong to (@pxref{package-cmd-propagated-inputs, @command{guix
package}}, for information on how @command{guix package} deals with
propagated inputs.)
For example this is necessary when a library needs headers of another
library to compile, or needs another shared library to be linked
alongside itself when a program wants to link to it.
For example this is necessary when a C/C++ library needs headers of
another library to compile, or when a pkg-config file refers to another
one @i{via} its @code{Requires} field.
Another example where @code{propagated-inputs} is useful is for
languages that lack a facility to record the run-time search path akin
to ELF's @code{RUNPATH}; this includes Guile, Python, Perl, GHC, and
more. To ensure that libraries written in those languages can find
library code they depend on at run time, run-time dependencies must be
listed in @code{propagated-inputs} rather than @code{inputs}.
@item @code{self-native-input?} (default: @code{#f})
This is a Boolean field telling whether the package should use itself as