diff options
Diffstat (limited to 'documentation/ref-manual')
| -rw-r--r-- | documentation/ref-manual/ref-structure.xml | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/documentation/ref-manual/ref-structure.xml b/documentation/ref-manual/ref-structure.xml index 6912d3f6b2..541a47e556 100644 --- a/documentation/ref-manual/ref-structure.xml +++ b/documentation/ref-manual/ref-structure.xml @@ -660,9 +660,21 @@ <title><filename>build/tmp/cache/</filename></title> <para> - When BitBake parses the metadata, it creates a cache file of the result that can - be used when subsequently running commands. - BitBake stores these results here on a per-machine basis. + When BitBake parses the metadata (recipes and configuration files), + it caches the results in <filename>build/tmp/cache/</filename> + to speed up future builds. + The results are stored on a per-machine basis. + </para> + + <para> + During subsequent builds, BitBake checks each recipe (together + with, for example, any files included or appended to it) to see + if they have been modified. + Changes can be detected, for example, through file modification + time (mtime) changes and hashing of file contents. + If no changes to the file are detected, then the parsed result + stored in the cache is reused. + If the file has changed, it is reparsed. </para> </section> |