Bug 14140 - variable flags starting with underscore are silently ignored
Summary: variable flags starting with underscore are silently ignored
Status: RESOLVED FIXED
Alias: None
Product: BitBake
Classification: Build System, Metadata & Runtime
Component: bitbake (show other bugs)
Version: unspecified
Hardware: x86 Multiple
: Medium normal
Target Milestone: 4.2 M1
Assignee: Michael Opdenacker
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Reported: 2020-12-01 14:01 UTC by Yann Dirson
Modified: 2022-10-28 13:33 UTC (History)
3 users (show)

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OS type for building Yocto: ---
Type of Regression: ---
Verified:
Documentation change: Yes (doc changes required)

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Description Yann Dirson 2020-12-01 14:01:47 UTC 
VAR[_a] = "foo" (or any underscore-starting flag name I tried) does not trigger a warning or error, but a subsequent getVarFlags("VAR") call never shows those flags starting with underscore.

If it is a limitation I'd think we should document it and add a warning or maybe even an error.  But then it's maybe just a bug :)
Comment 1 Randy MacLeod 2020-12-03 15:41:42 UTC 
This is expected behaviour, the _ is for internal usage but should documented.
Comment 2 Randy MacLeod 2021-04-22 17:51:36 UTC 
Michael, Could you check if this expected usage limitation is in the docs and if not, add it?
Comment 3 Michael Opdenacker 2022-09-21 13:33:33 UTC 
Indeed, the behavior remains the same.
I posted a patch to document this:
https://lists.yoctoproject.org/g/docs/message/3200
Comment 4 Michael Opdenacker 2022-10-28 13:33:45 UTC 
Now fixed in master:
https://git.openembedded.org/bitbake/commit/?id=0f3e9d87168813ce49995ff04bccdce11c5f7b47