Fixed:
MACHINE = "qemux86-64"
require conf/multilib.conf
MULTILIBS = "multilib:lib32"
DEFAULTTUNE_virtclass-multilib-lib32 = "x86"

PREFERRED_VERSION_lttng-modules = "2.10.10+git%"

$ bitbake world

NOTE: preferred version 2.10.10+git% of lttng-modules not available (for item 
lib32-lttng-modules)
NOTE: versions of lttng-modules available: 2.10.10
ERROR: Multiple versions of lttng-modules are due to be built 
(/path/to/lttng-modules_2.10.10.bb 
virtual:devupstream:target:/path/to/lttng-modules_2.10.10.bb). Only one version 
of a given PN should be built in any given build. You likely need to set 
PREFERRED_VERSION_lttng-modules to select the correct version or don't depend 
on multiple versions.

This is because 2.10.10+git% will be built for non-multilib lttng-modules since
the PREFERRED_VERSION is set, but this version doesn't provide
lib32-lttng-modules, so 2.10.10 will be built, then the error happens.

Bitbake can't extend an extended recipe, for example:
virtual:multilib:lib32:virtual:devupstream:target

Or in a reverse order:
virtual:devupstream:target:virtual:multilib:lib32

So disable devupstream when multilib is enabled.

Signed-off-by: Robert Yang <[email protected]>
---
 meta/classes/devupstream.bbclass | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/classes/devupstream.bbclass b/meta/classes/devupstream.bbclass
index 7780c54..25403da 100644
--- a/meta/classes/devupstream.bbclass
+++ b/meta/classes/devupstream.bbclass
@@ -19,6 +19,12 @@
 CLASSOVERRIDE .= ":class-devupstream"
 
 python devupstream_virtclass_handler () {
+    # bitbake can't extend an extended recipe, for example:
+    # virtual:multilib:lib32:virtual:devupstream:target
+    # So disable devupstream when multilib is enabled.
+    if d.getVar('MULTILIBS'):
+        raise bb.parse.SkipRecipe("Disable devupstream when multilib is 
enabled")
+
     # Do nothing if this is inherited, as it's for BBCLASSEXTEND
     if "devupstream" not in (d.getVar('BBCLASSEXTEND') or ""):
         bb.error("Don't inherit devupstream, use BBCLASSEXTEND")
-- 
2.7.4

-- 
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