On Thu, 3 Dec 2020, Quentin Schulz wrote: > Hi Andrew, > > On Thu, Dec 03, 2020 at 03:45:41AM +0000, Andrew Loader wrote: > > In the bitbake user manual it has an example of how to set the variable > > value using the OVERRIDE variable > > > > OVERRIDES = "architecture:os:machine" > > TEST = "default" > > TEST_os = "osspecific" > > TEST_nooverride = "othercondvalue" > > > > Lets say this is in the recipe called "test_0.1.bb" and we remove the > > OVERRIDES line from it > > > > If we want to the OVERRIDES value to configure the recipe externally say in > > local.conf as I do not want to change the recipe how would I do that? > > OVERRIDES is set in configuration files usually (always?). It can be > either in a distro if you use DISTROOVERRIDES, in a machine if you > use MACHINEOVERRIDES, and you might be able to add manually to it > from local.conf or other ways but I think you should go with > DISTROOVERRIDES or MACHINEOVERRIDES. > > Then, the OVERRIDES (which contains MACHINEOVERRIDES:DISTROOVERRIDES > among other things) will be used in all recipes you can find and it > should just work. > > You can use bitbake -e my-recipe | grep -e "^OVERRIDES=" to check > the content of the OVERRIDES variable. Note that righmost "OVERRIDE" > is the one which takes precedence over all others.
i'm going to weigh in on this, as it *seems* that andrew has the same misunderstanding i had when, lo those many years ago, i read that section in the BB manual, and read this: OVERRIDES = "architecture:os:machine" TEST = "default" TEST_os = "osspecific" TEST_nooverride = "othercondvalue" my initial problem with that section was that it wasn't clear that entities like "architecture" and "os" and so on were *replaceable*, in that one was supposed to put *examples* of those values in those places. (laugh if you like, but if one is totally new to overrides, that section can be misinterpreted in a truly tragic way on first reading.) i recall extending that section to attempt to make it more understandable, but i think, over the holidays, i'm going to rewrite it again with a simpler introduction and more examples straight from the code base. (i believe i was the one who added the example involving overriding the value of KBRANCH based on the target arch.) in any event, i can easily see a much longer and involved introduction to overrides. rday
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