diff options
| -rw-r--r-- | doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml index 436abd5ec..f7b541d9d 100644 --- a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml @@ -316,7 +316,7 @@ </literallayout> <note> It is never necessary to use "+=" together with "_append". - The following sequence of assignments appepnds "barbaz" to + The following sequence of assignments appends "barbaz" to <filename>FOO</filename>: <literallayout class='monospaced'> FOO_append = "bar" @@ -401,6 +401,21 @@ PN = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[0] or 'defaultpkgname'}" PV = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE', False),d)[1] or '1.0'}" </literallayout> + <note> + Inline Python expressions work just like variable expansions + insofar as the "=" and ":=" operators are concerned. + Given the following assignment, <filename>foo()</filename> + is called each time <filename>FOO</filename> is expanded: + <literallayout class='monospaced'> + FOO = "${@foo()}" + </literallayout> + Contrast this with the following immediate assignment, where + <filename>foo()</filename> is only called once, while the + assignment is parsed: + <literallayout class='monospaced'> + FOO := "${@foo()}" + </literallayout> + </note> </para> </section> |