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86a415df8a
Asciidoc supports two syntaxes for section titles: two-line titles (title
plus underline consisting of a particular symbol), and one-line titles
(title prefixed with a specific number of = signs).
The two-line title underlines are:
Level 0 (top level): ======================
Level 1: ----------------------
Level 2: ~~~~~~~~~~~~~~~~~~~~~~
Level 3: ^^^^^^^^^^^^^^^^^^^^^^
Level 4 (bottom level): ++++++++++++++++++++++
and the one-line title prefixes:
= Document Title (level 0) =
== Section title (level 1) ==
=== Section title (level 2) ===
==== Section title (level 3) ====
===== Section title (level 4) =====
The buildroot manual is currenly using the two-line titles, but this has
multiple disadvantages:
- asciidoc also uses some of the underline symbols for other purposes (like
preformatted code, example blocks, ...), which makes it difficult to do
mass replacements, such as a planned follow-up patch that needs to move
all sections one level down.
- it is difficult to remember which level a given underline symbol (=-~^+)
corresponds to, while counting = signs is easy.
This patch changes all two-level titles to one-level titles in the manual.
The bulk of the change was done with the following Python script, except for
the level 1 titles (-----) as these underlines are also used for literal
code blocks.
This patch only changes the titles, no other changes. In
adding-packages-directory.txt, I did add missing newlines between some
titles and their content.
----------------------------------------------------------------------------
#!/usr/bin/env python
import sys
import mmap
import re
for input in sys.argv[1:]:
f = open(input, 'r+')
f.flush()
s = mmap.mmap(f.fileno(), 0)
# Level 0 (top level): ====================== =
# Level 1: ---------------------- ==
# Level 2: ~~~~~~~~~~~~~~~~~~~~~~ ===
# Level 3: ^^^^^^^^^^^^^^^^^^^^^^ ====
# Level 4 (bottom level): ++++++++++++++++++++++ =====
def replace_title(s, symbol, replacement):
pattern = re.compile(r'(.+\n)\%s{2,}\n' % symbol, re.MULTILINE)
return pattern.sub(r'%s \1' % replacement, s)
new = s
new = replace_title(new, '=', '=')
new = replace_title(new, '+', '=====')
new = replace_title(new, '^', '====')
new = replace_title(new, '~', '===')
#new = replace_title(new, '-', '==')
s.seek(0)
s.write(new)
s.resize(s.tell())
s.close()
f.close()
----------------------------------------------------------------------------
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
123 lines
6.0 KiB
Plaintext
123 lines
6.0 KiB
Plaintext
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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[[full-rebuild]]
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=== Understanding when a full rebuild is necessary
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Buildroot does not attempt to detect what parts of the system should
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be rebuilt when the system configuration is changed through +make
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menuconfig+, +make xconfig+ or one of the other configuration
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tools. In some cases, Buildroot should rebuild the entire system, in
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some cases, only a specific subset of packages. But detecting this in
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a completely reliable manner is very difficult, and therefore the
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Buildroot developers have decided to simply not attempt to do this.
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Instead, it is the responsibility of the user to know when a full
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rebuild is necessary. As a hint, here are a few rules of thumb that
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can help you understand how to work with Buildroot:
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* When the target architecture configuration is changed, a complete
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rebuild is needed. Changing the architecture variant, the binary
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format or the floating point strategy for example has an impact on
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the entire system.
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* When the toolchain configuration is changed, a complete rebuild
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generally is needed. Changing the toolchain configuration often
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involves changing the compiler version, the type of C library or
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its configuration, or some other fundamental configuration item,
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and these changes have an impact on the entire system.
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* When an additional package is added to the configuration, a full
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rebuild is not necessarily needed. Buildroot will detect that this
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package has never been built, and will build it. However, if this
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package is a library that can optionally be used by packages that
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have already been built, Buildroot will not automatically rebuild
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those. Either you know which packages should be rebuilt, and you
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can rebuild them manually, or you should do a full rebuild. For
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example, let's suppose you have built a system with the +ctorrent+
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package, but without +openssl+. Your system works, but you realize
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you would like to have SSL support in +ctorrent+, so you enable the
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+openssl+ package in Buildroot configuration and restart the
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build. Buildroot will detect that +openssl+ should be built and
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will be build it, but it will not detect that +ctorrent+ should be
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rebuilt to benefit from +openssl+ to add OpenSSL support. You will
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either have to do a full rebuild, or rebuild +ctorrent+ itself.
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* When a package is removed from the configuration, Buildroot does
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not do anything special. It does not remove the files installed by
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this package from the target root filesystem or from the toolchain
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_sysroot_. A full rebuild is needed to get rid of this
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package. However, generally you don't necessarily need this package
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to be removed right now: you can wait for the next lunch break to
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restart the build from scratch.
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* When the sub-options of a package are changed, the package is not
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automatically rebuilt. After making such changes, rebuilding only
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this package is often sufficient, unless enabling the package
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sub-option adds some features to the package that are useful for
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another package which has already been built. Again, Buildroot does
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not track when a package should be rebuilt: once a package has been
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built, it is never rebuilt unless explicitly told to do so.
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* When a change to the root filesystem skeleton is made, a full
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rebuild is needed. However, when changes to the root filesystem
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overlay, a post-build script or a post-image script are made,
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there is no need for a full rebuild: a simple +make+ invocation
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will take the changes into account.
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Generally speaking, when you're facing a build error and you're unsure
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of the potential consequences of the configuration changes you've
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made, do a full rebuild. If you get the same build error, then you are
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sure that the error is not related to partial rebuilds of packages,
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and if this error occurs with packages from the official Buildroot, do
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not hesitate to report the problem! As your experience with Buildroot
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progresses, you will progressively learn when a full rebuild is really
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necessary, and you will save more and more time.
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For reference, a full rebuild is achieved by running:
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---------------
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$ make clean all
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---------------
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[[rebuild-pkg]]
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=== Understanding how to rebuild packages
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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 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, or which package would be compiled differently
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depending on the availability of another package.
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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. You
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can ask buildroot to do this with the +make <package>-dirclean+ command.
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On the other hand, if you only want to restart the build process of a
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package from its compilation step, you can run +make
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<package>-rebuild+, followed by +make+ or +make <package>+. It will
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restart the compilation and installation of the package, but not from
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scratch: it basically re-executes +make+ and +make install+
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inside the package, so it will only rebuild files that changed.
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If you want to restart the build process of a package from its
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configuration step, you can run +make <package>-reconfigure+, followed
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by +make+ or +make <package>+. It will restart the configuration,
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compilation and installation of the package.
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Internally, Buildroot creates so-called _stamp files_ to keep track of
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which build steps have been completed for each package. They are
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stored in the package build directory,
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+output/build/<package>-<version>/+ and are named
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+.stamp_<step-name>+. The commands detailed above simply manipulate
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these stamp files to force Buildroot to restart a specific set of
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steps of a package build process.
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Further details about package special make targets are explained in
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xref:pkg-build-steps[].
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