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-rw-r--r-- | documentation/ref-manual/variables.rst | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst index 5ec19970e4..2cb37b6a2b 100644 --- a/documentation/ref-manual/variables.rst +++ b/documentation/ref-manual/variables.rst | |||
@@ -5915,23 +5915,16 @@ system and gives an overview of their function and contents. | |||
5915 | file ``eudev_3.2.9.bb``: | 5915 | file ``eudev_3.2.9.bb``: |
5916 | :: | 5916 | :: |
5917 | 5917 | ||
5918 | PROVIDES = "udev" | 5918 | PROVIDES += "udev" |
5919 | 5919 | ||
5920 | The ``PROVIDES`` statement | 5920 | The ``PROVIDES`` statement |
5921 | results in the "eudev" recipe also being available as simply "udev". | 5921 | results in the "eudev" recipe also being available as simply "udev". |
5922 | 5922 | ||
5923 | .. note:: | 5923 | .. note:: |
5924 | 5924 | ||
5925 | Given that a recipe's own recipe name is already implicitly in its | 5925 | A recipe's own recipe name (:term:`PN`) is always implicitly prepended |
5926 | own PROVIDES list, it is unnecessary to add aliases with the "+=" operator; | 5926 | to `PROVIDES`, so while using "+=" in the above example may not be |
5927 | using a simple assignment will be sufficient. In other words, | 5927 | strictly necessary it is recommended to avoid confusion. |
5928 | while you could write: | ||
5929 | :: | ||
5930 | |||
5931 | PROVIDES += "udev" | ||
5932 | |||
5933 | |||
5934 | in the above, the "+=" is overkill and unnecessary. | ||
5935 | 5928 | ||
5936 | In addition to providing recipes under alternate names, the | 5929 | In addition to providing recipes under alternate names, the |
5937 | ``PROVIDES`` mechanism is also used to implement virtual targets. A | 5930 | ``PROVIDES`` mechanism is also used to implement virtual targets. A |