diff options
Diffstat (limited to 'poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst')
| -rw-r--r-- | poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst index 174cac7818..af4b135867 100644 --- a/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst +++ b/poky/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.rst @@ -510,8 +510,8 @@ variable. .. note:: - Overrides can only use lower-case characters. Additionally, - underscores are not permitted in override names as they are used to + Overrides can only use lower-case characters, digits and dashes. + In particular, colons are not permitted in override names as they are used to separate overrides from each other and from the variable name. - *Selecting a Variable:* The :term:`OVERRIDES` variable is a @@ -523,14 +523,14 @@ variable. OVERRIDES = "architecture:os:machine" TEST = "default" - TEST_os = "osspecific" - TEST_nooverride = "othercondvalue" + TEST:os = "osspecific" + TEST:nooverride = "othercondvalue" In this example, the :term:`OVERRIDES` variable lists three overrides: "architecture", "os", and "machine". The variable ``TEST`` by itself has a default value of "default". You select the os-specific version of the ``TEST`` variable by appending - the "os" override to the variable (i.e. ``TEST_os``). + the "os" override to the variable (i.e. ``TEST:os``). To better understand this, consider a practical example that assumes an OpenEmbedded metadata-based Linux kernel recipe file. The @@ -567,7 +567,7 @@ variable. - *Setting a Variable for a Single Task:* BitBake supports setting a variable just for the duration of a single task. Here is an example:: - FOO_task-configure = "val 1" + FOO:task-configure = "val 1" FOO:task-compile = "val 2" In the @@ -585,6 +585,16 @@ variable. EXTRA_OEMAKE:prepend:task-compile = "${PARALLEL_MAKE} " +.. note:: + + Before BitBake 1.52 (Honister 3.4), the syntax for :term:`OVERRIDES` + used ``_`` instead of ``:``, so you will still find a lot of documentation + using ``_append``, ``_prepend``, and ``_remove``, for example. + + For details, see the + :yocto_docs:`Overrides Syntax Changes </migration-guides/migration-3.4.html#override-syntax-changes>` + section in the Yocto Project manual migration notes. + Key Expansion ------------- @@ -1648,8 +1658,8 @@ user interfaces: .. _variants-class-extension-mechanism: -Variants - Class Extension Mechanism -==================================== +Variants --- Class Extension Mechanism +====================================== BitBake supports multiple incarnations of a recipe file via the :term:`BBCLASSEXTEND` variable. |