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>
70 lines
2.6 KiB
Plaintext
70 lines
2.6 KiB
Plaintext
// -*- mode:doc; -*-
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// vim: set syntax=asciidoc:
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== How Buildroot works
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As mentioned above, Buildroot is basically a set of Makefiles that
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download, configure, and compile software with the correct options. It
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also includes patches for various software packages - mainly the ones
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involved in the cross-compilation toolchain (+gcc+, +binutils+ and
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+uClibc+).
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There is basically one Makefile per software package, and they are
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named with the +.mk+ extension. Makefiles are split into many different
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parts.
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* The +toolchain/+ directory contains the Makefiles
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and associated files for all software related to the
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cross-compilation toolchain: +binutils+, +gcc+, +gdb+,
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+kernel-headers+ and +uClibc+.
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* The +arch/+ directory contains the definitions for all the processor
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architectures that are supported by Buildroot.
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* The +package/+ directory contains the Makefiles and
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associated files for all user-space tools and libraries that Buildroot
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can compile and add to the target root filesystem. There is one
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sub-directory per package.
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* The +linux/+ directory contains the Makefiles and associated files for
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the Linux kernel.
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* The +boot/+ directory contains the Makefiles and associated files for
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the bootloaders supported by Buildroot.
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* The +system/+ directory contains support for system integration, e.g.
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the target filesystem skeleton and the selection of an init system.
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* The +fs/+ directory contains the Makefiles and
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associated files for software related to the generation of the
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target root filesystem image.
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Each directory contains at least 2 files:
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* +something.mk+ is the Makefile that downloads, configures,
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compiles and installs the package +something+.
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* +Config.in+ is a part of the configuration tool
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description file. It describes the options related to the
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package.
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The main Makefile performs the following steps (once the
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configuration is done):
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* Create all the output directories: +staging+, +target+, +build+,
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etc. in the output directory (+output/+ by default,
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another value can be specified using +O=+)
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* Generate the toolchain target. When an internal toolchain is used, this
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means generating the cross-compilation toolchain. When an external
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toolchain is used, this means checking the features of the external
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toolchain and importing it into the Buildroot environment.
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* Generate all the targets listed in the +TARGETS+ variable. This
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variable is filled by all the individual components'
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Makefiles. Generating these targets will trigger the compilation of
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the userspace packages (libraries, programs), the kernel, the
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bootloader and the generation of the root filesystem images,
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depending on the configuration.
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