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authorMark H Weaver <mhw@netris.org>2016-10-19 10:54:36 -0400
committerMark H Weaver <mhw@netris.org>2016-10-19 10:54:36 -0400
commitd2478b4cdd6f1db44f4725b39489aca89d3d9180 (patch)
treebc4714453fd9b7a2e64fcd5f58c24d371dbb91d8 /doc
parentc9a71c6fdab6914dd648b76c349c3af9018cad35 (diff)
parent152ffe7cb6ba02915d8645102e0f6dfeb639090d (diff)
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Merge branch 'master' into core-updates
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diff --git a/doc/guix.texi b/doc/guix.texi
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+++ b/doc/guix.texi
@@ -4513,6 +4513,30 @@ This is a recursive, deep replacement. So in this example, both
This is implemented using the @code{package-input-rewriting} Scheme
procedure (@pxref{Defining Packages, @code{package-input-rewriting}}).
+
+@item --with-graft=@var{package}=@var{replacement}
+This is similar to @code{--with-input} but with an important difference:
+instead of rebuilding all the dependency chain, @var{replacement} is
+built and then @dfn{grafted} onto the binaries that were initially
+referring to @var{package}. @xref{Security Updates}, for more
+information on grafts.
+
+For example, the command below grafts version 3.5.4 of GnuTLS onto Wget
+and all its dependencies, replacing references to the version of GnuTLS
+they currently refer to:
+
+@example
+guix build --with-graft=gnutls=gnutls@@3.5.4 wget
+@end example
+
+This has the advantage of being much faster than rebuilding everything.
+But there is a caveat: it works if and only if @var{package} and
+@var{replacement} are strictly compatible---for example, if they provide
+a library, the application binary interface (ABI) of those libraries
+must be compatible. If @var{replacement} is somehow incompatible with
+@var{package}, then the resulting package may be unusable. Use with
+care!
+
@end table
@node Additional Build Options