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If you build virtual/kernel, then change PREFERRED_PROVIDER_virtual/kernel from say "linux-yocto" to "linux-yocto-dev", you see errors from the sysroot about overlapping files. The automatic uninstall logic doesn't trigger since the other recipes is still technically parsed/buildable. What we can do is look at the value of PREFERRED_PROVIDER_virtual/X and raise SkipRecipe (skip parsing) if it provides this thing and its not selected. We skip cases no preferred provider is set, or the value is in MULTI_PROVIDER_WHITELIST.We also inform the user if they try to build something which conflicts with the configuration: $ bitbake linux-yocto-tiny ERROR: Nothing PROVIDES 'linux-yocto-tiny' ERROR: linux-yocto-tiny was skipped: PREFERRED_PROVIDER_virtual/kernel set to linux-yocto, not linux-yocto-tiny [YOCTO #4102] (From OE-Core rev: 9a3b992b7339f7aa892f1dff7d159747630b045d) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>