Hi RP,
Thanks, Can we provide a replacement for the "bitbake PN-PV" since it is
useful, for example, can we support the PREFERRED_VERSION_${PN} in the env
in the future ? There is a similar bug:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=4965
// Robert
On 09/09/2013 10:14 PM, Richard Purdie wrote:
For a long time we've provided PN-PV and PN-PV-PR by tweaking PROVIDES. This
looks
nice at first glance however it turns out to be a bit problematic. Taking make
as an
example where there are two versions, 3.81 and 3.82, what should "bitbake
make-3.81" do?
Currently it builds make-3.81 and make-3.82 and breaks in interesting ways. Is
that
a bitbake bug? Well, it certainly shouldn't try and run the build. Why is it
building
3.82 though? Its due to finding a dependency on "make-dev" and then trying to
figure
out what provides it? The answer is "make" and the default version of "make" is
3.82.
So arguably, finding "make-3.81" should infer PREFERRED_VERSION_make = "3.81".
Doing
so resolved the above problem since now "make" resolves to "make-3.81".
So what about if we have Recipe A:
DEPENDS = "make-3.81"
and Recipe B:
DEPENDS = "make-3.82"
That is clearly an error, easy. So finally what about if we have Recipe A:
DEPENDS = "make-3.81"
and Recipe B:
DEPENDS = "make"
The first recipe infers the PREFERRED_VERSION_make = "3.81" and then forces that
version on everything else. Is that desired? Probably not in most cases, at
least not
silently.
As mitigation, we could print a WARNING about this happening. The final part of
the problem
is that we can ony figure this out within bitbake itself. That means we'd have
to teach bitbake
about the PN-PV format of PROVIDES which is breaking the separation between
bitbake and the
metadata. We can't win :(.
Nobody that I know of is using or relying on this functionality so perhaps we
should
just remove it instead which is what this patch does. Opinions?
Signed-off-by: Richard Purdie <richard.pur...@linuxfoundation.org>
---
diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 2d19d86..578c7d0 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -253,7 +253,7 @@ DEPCHAIN_POST = "-dev -dbg"
DEPENDS = ""
RDEPENDS = ""
PROVIDES = ""
-PROVIDES_prepend = "${P} ${PF} ${PN} "
+PROVIDES_prepend = "${PN} "
RPROVIDES = ""
MULTI_PROVIDER_WHITELIST = "virtual/libintl virtual/libintl-native
virtual/nativesdk-libintl virtual/xserver virtual/update-alternatives-native
virtual/update-alternatives"
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