Hello Robert & Leon,
> So I think it might be harmful to replace it with "=", as it would no
> longer provide libpcre.
I had a look at the variable expansions bitbake -e. Here are two
examples. The vim recipe uses "PROVIDES = xxd" (which would cause
weird effects if = simply overwrote any existing ${PN} value), and the
libpcre2 recipe uses "PROVIDES += pcre2", as already mentioned.
vim:
# $PROVIDES [4 operations]
# set ... /poky/meta/conf/bitbake.conf:275
# ""
# _prepend ... /poky/meta/conf/bitbake.conf:276
# "${PN} "
# set ... /poky/meta/conf/documentation.conf:335
# [doc] "A list of aliases that a recipe also provides. ... SNIP ...
# set ... /poky/meta/recipes-support/vim/vim_8.2.bb:3
# "xxd"
# pre-expansion value:
# "${PN} xxd"
PROVIDES="vim xxd"
libpcre2:
# $PROVIDES [4 operations]
# set ... /poky/meta/conf/bitbake.conf:275
# ""
# _prepend ... /poky/meta/conf/bitbake.conf:276
# "${PN} "
# set ... /poky/meta/conf/documentation.conf:335
# [doc] "A list of aliases that a recipe also provides. ... SNIP ....
# append ... /poky/meta/recipes-support/libpcre/libpcre2_10.33.bb:24
# "pcre2"
# pre-expansion value:
# "${PN} pcre2"
PROVIDES="libpcre2 pcre2"
My understanding is that ${PN} is always _prepend'ed to PROVIDES, and
due to evaluation order of the different assignment operators,
_prepend will be executed *after* = and +=. This means both
assignments are "harmless". += will give you an extra space though.
See the bottom example here:
https://www.yoctoproject.org/docs/3.1/bitbake-user-manual/bitbake-user-manual.html#variable-interaction-worked-examples
Cheers,
Jonatan
-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#48309): https://lists.yoctoproject.org/g/yocto/message/48309
Mute This Topic: https://lists.yoctoproject.org/mt/71078290/21656
Group Owner: [email protected]
Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub
[[email protected]]
-=-=-=-=-=-=-=-=-=-=-=-
