2011-10-10 10:46:39 +02:00
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Understanding how to rebuild packages
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=====================================
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One of the most common questions asked by Buildroot users is how to
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rebuild a given package or how to remove a package without rebuilding
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everything from scratch.
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Removing a package is currently unsupported by Buildroot without
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rebuilding from scratch. This is because Buildroot doesn't keep track
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of which package installs what files in the +output/staging+ and
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+output/target+ directories. However, implementing clean package
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removal is on the TODO-list of Buildroot developers.
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The easiest way to rebuild a single package from scratch is to remove
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its build directory in +output/build+. Buildroot will then re-extract,
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re-configure, re-compile and re-install this package from scratch.
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2012-04-06 18:44:22 +02:00
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For convenience, most packages support the special make targets
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<package>-reconfigure and <package>-rebuild to repeat the configure
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and build steps.
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2011-10-10 10:46:39 +02:00
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However, if you don't want to rebuild the package completely from
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scratch, a better understanding of the Buildroot internals is
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needed. Internally, to keep track of which steps have been done and
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which steps remain to be done, Buildroot maintains stamp files (empty
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files that just tell whether this or that action has been done). The
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problem is that these stamp files are not uniformly named and handled
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by the different packages, so some understanding of the particular
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package is needed.
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For packages relying on Buildroot packages infrastructures (see
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2012-08-18 23:58:55 +02:00
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xref:adding-packages[this section] for details), the following stamp
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2011-10-10 10:46:39 +02:00
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files are relevant:
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* +output/build/packagename-version/.stamp_configured+. If removed,
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Buildroot will trigger the recompilation of the package from the
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configuration step (execution of +./configure+).
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* +output/build/packagename-version/.stamp_built+. If removed,
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Buildroot will trigger the recompilation of the package from the
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compilation step (execution of +make+).
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For other packages, an analysis of the specific 'package.mk' file is
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needed. For example, the zlib Makefile used to look like this (before
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it was converted to the generic package infrastructure):
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-----------------
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$(ZLIB_DIR)/.configured: $(ZLIB_DIR)/.patched
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(cd $(ZLIB_DIR); rm -rf config.cache; \
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[...]
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)
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touch $@
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$(ZLIB_DIR)/libz.a: $(ZLIB_DIR)/.configured
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$(MAKE) -C $(ZLIB_DIR) all libz.a
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touch -c $@
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-----------------
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If you want to trigger the reconfiguration, you need to remove
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+output/build/zlib-version/.configured+. If you want to trigger only
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the recompilation, you need to remove
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+output/build/zlib-version/libz.a+.
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Note that most packages, if not all, will progressively be ported over
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to the generic or autotools infrastructure, making it much easier to
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rebuild individual packages.
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