diff options
Diffstat (limited to 'documentation/poky-ref-manual')
| -rw-r--r-- | documentation/poky-ref-manual/ref-bitbake.xml | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/documentation/poky-ref-manual/ref-bitbake.xml b/documentation/poky-ref-manual/ref-bitbake.xml index d870387aa..75b3bf5e5 100644 --- a/documentation/poky-ref-manual/ref-bitbake.xml +++ b/documentation/poky-ref-manual/ref-bitbake.xml @@ -33,15 +33,15 @@ <para> The first thing BitBake does is look for the <filename>bitbake.conf</filename> file. - Poky keeps this file in <filename class="directory">meta/conf/</filename>. + Poky keeps this file in <filename>meta/conf/</filename>. BitBake finds it by examining the <filename>BBPATH</filename> environment - variable and looking for the <filename class="directory">meta/conf/</filename> + variable and looking for the <filename>meta/conf/</filename> directory. </para> <para> In Poky, <filename>bitbake.conf</filename> lists other configuration - files to include from a <filename class="directory">conf/</filename> + files to include from a <filename>conf/</filename> directory below the directories listed in <filename>BBPATH</filename>. In general the most important configuration file from a user's perspective is <filename>local.conf</filename>, which contains a user's customized @@ -54,11 +54,11 @@ The DISTRO and MACHINE environment variables are both usually set in the <filename>local.conf</filename> file. Valid distribution - configuration files are available in the <filename class="directory"> + configuration files are available in the <filename> meta/conf/distro/</filename> directory and valid machine configuration - files in the <filename class="directory">meta/conf/machine/</filename> + files in the <filename>meta/conf/machine/</filename> directory. - Within the <filename class="directory">meta/conf/machine/include/</filename> + Within the <filename>meta/conf/machine/include/</filename> directory are various <filename>tune-*.inc</filename> configuration files that provide common "tuning" settings specific to and shared between particular architectures and machines. </para> @@ -79,29 +79,29 @@ variable <glossterm><link linkend='var-BBFILES'>BBFILES</link></glossterm> is set, usually in <filename>local.conf</filename>, and defines the list of places to search for - <filename class="extension">.bb</filename> files. - By default, the BBFILES variable specifies the <filename class="directory">meta/recipes-*/ + <filename>.bb</filename> files. + By default, the BBFILES variable specifies the <filename>meta/recipes-*/ </filename> directory within Poky. Adding extra content to BBFILES is best achieved through the use of BitBake <link linkend='usingpoky-changes-layers'>"layers"</link>. </para> <para> - BitBake parses each <filename class="extension">.bb</filename> file in BBFILES and + BitBake parses each <filename>.bb</filename> file in BBFILES and stores the values of various variables. - In summary, for each <filename class="extension">.bb</filename> + In summary, for each <filename>.bb</filename> file the configuration plus the base class of variables are set, followed - by the data in the <filename class="extension">.bb</filename> file + by the data in the <filename>.bb</filename> file itself, followed by any inherit commands that - <filename class="extension">.bb</filename> file might contain. + <filename>.bb</filename> file might contain. </para> <para> - Because parsing <filename class="extension">.bb</filename> files is a time + Because parsing <filename>.bb</filename> files is a time consuming process, a cache is kept to speed up subsequent parsing. - This cache is invalid if the timestamp of the <filename class="extension">.bb</filename> + This cache is invalid if the timestamp of the <filename>.bb</filename> file itself changes, or if the timestamps of any of the include, - configuration or class files the <filename class="extension">.bb</filename> + configuration or class files the <filename>.bb</filename> file depends on changes. </para> </section> @@ -110,7 +110,7 @@ <title>Preferences and Providers</title> <para> - Once all the <filename class="extension">.bb</filename> files have been + Once all the <filename>.bb</filename> files have been parsed, BitBake starts to build the target (poky-image-sato in the previous section's example) and looks for providers of that target. Once a provider is selected, BitBake resolves all the dependencies for @@ -200,11 +200,11 @@ PREFERRED_PROVIDER_virtual/kernel = "linux-rp" <para> As each task completes, a timestamp is written to the directory specified by the <glossterm><link linkend='var-STAMPS'>STAMPS</link></glossterm> variable (usually - <filename class="directory">build/tmp/stamps/*/</filename>). + <filename>build/tmp/stamps/*/</filename>). On subsequent runs, BitBake looks at the STAMPS directory and does not rerun tasks that are already completed unless a timestamp is found to be invalid. Currently, invalid timestamps are only considered on a per - <filename class="extension">.bb</filename> file basis. + <filename>.bb</filename> file basis. So, for example, if the configure stamp has a timestamp greater than the compile timestamp for a given target then the compile task would rerun. Running the compile task again, however, has no effect on other providers |