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doc: Clarify what propagated inputs are.

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Fixes <https://bugs.gnu.org/26170>.

* doc/guix.texi (package Reference)[package-propagated-inputs]: Clarify.
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Florian Pelz 2020-09-16 15:18:08 +02:00
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@ -59,7 +59,7 @@ Copyright @copyright{} 2018 Oleg Pykhalov@*
Copyright @copyright{} 2018 Mike Gerwitz@*
Copyright @copyright{} 2018 Pierre-Antoine Rouby@*
Copyright @copyright{} 2018, 2019 Gábor Boskovits@*
Copyright @copyright{} 2018, 2019 Florian Pelz@*
Copyright @copyright{} 2018, 2019, 2020 Florian Pelz@*
Copyright @copyright{} 2018 Laura Lazzati@*
Copyright @copyright{} 2018 Alex Vong@*
Copyright @copyright{} 2019 Josh Holland@*
@ -6370,21 +6370,22 @@ this area (@pxref{Invoking guix lint}).
@anchor{package-propagated-inputs}
Lastly, @code{propagated-inputs} is similar to @code{inputs}, but the
specified packages will be automatically installed alongside the package
specified packages will be automatically installed to profiles
(@pxref{Features, the role of profiles in Guix}) alongside the package
they 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 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.
For example this is necessary when packaging a C/C++ library that 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 the
@code{RUNPATH} of ELF files; this includes Guile, Python, Perl, 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}.
more. When packaging libraries written in those languages, ensure they
can find library code they depend on at run time by listing run-time
dependencies in @code{propagated-inputs} rather than @code{inputs}.
@item @code{outputs} (default: @code{'("out")})
The list of output names of the package. @xref{Packages with Multiple