On 05/11/2014 02:13 PM, Richard Purdie wrote:
On Sun, 2014-05-11 at 00:31 +0200, [email protected] wrote:
2014-05-10 18:58 skrev Khem Raj:
On Sat, May 10, 2014 at 1:05 AM, Petter Mabäcker <[email protected]>
wrote:
+FILESEXTRAPATHS_prepend := "${THISDIR}/systemtap:"
would something like
FILESEXTRAPATHS =. "${FILE_DIRNAME}/systemtap:"
avoid the prepend and immediate evaluation
I guess someone with deep bitbake knowledge can answer this better. But
as far as I understand, you should always use immediate evaluation when
using THISDIR, to be extra safe. Not sure if it's more safe to use
FILE_DIRNAME if you want to avoid immediate expanding when using
FILESEXTRAPATHS?
The bitbake documentations says:
"The operators "_append" and "_prepend" differ from the operators ".="
and "=." in that they are deferred until after parsing completes rather
than being immediately applied."
Not sure if above means that "=." will also immediately expand
variables or not?
They're not.
Personally I have always used FILESEXTRAPATHS_prepend :=
"${THISDIR}/<somename>:" like the yocto documentation recommends. But
sure if you can avoid immediate expanding in FILESEXTRPATHS, that would
mean a tiny optimization. In that case perhaps the documentation should
be updated as well. Looking in meta-layer both methods seems to be used.
What Khem means is that in the case we know we're in the .bb file
directory, we can use FILE_DIRNAME instead of using :=.
Why? FILE_DIRNAME is defined as:
conf/bitbake.conf:FILE_DIRNAME = "${@os.path.dirname(d.getVar('FILE'))}"
FILE will point to the .bb file.
Cheers,
Richard
Ok, that makes sense. I will send up a new changeset using this method
instead.
BR,
Petter
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