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authorGravatar Thomas Petazzoni <thomas.petazzoni@bootlin.com>2018-03-24 15:20:02 +0100
committerGravatar Peter Korsgaard <peter@korsgaard.com>2018-03-25 17:43:07 +0200
commite15ec4c56b811449047049cba89e178d8ee0fccd (patch)
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parent6729050f3a49dba42d2d881d31dbefd6b82b8dad (diff)
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package/pkg-generic: add the concept of extract dependency
Extract dependencies are dependencies that must be ready before the extract step of a package, i.e for tools that are needed to extract packages themselves. Current examples of such tools are host-tar, host-lzip and host-xz. They are currently handled through DEPENDENCIES_HOST_PREREQ. However, this mechanism has a number of drawbacks: - First and foremost, because host-tar/host-lzip/host-xz are not listed in the dependencies of packages, the package infrastructure does not know it should rsync them in the context of per-package SDK. - Second, there is no dependency handling *between* them. I.e, we have no mechanism that says host-tar should be built before host-lzip, while it is in fact the case: if you need to build host-lzip, you need to extract a tarball, so you may need host-tar if your system tarball is not capable enough. For those reasons, it makes sense to add explicit support for "extract dependencies" in the package infrastructure, through the <pkg>_EXTRACT_DEPENDENCIES variable. It is unlikely this variable will ever be used by a package .mk file, but it will be used internally by the package infrastructure. [Peter: fix typo in manual] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Tested-by: Matt Weber <matthew.weber@rockwellcollins.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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