On 3/9/2012 2:51 AM, Robert P. J. Day wrote: > (i posted something regarding this on the oe-core list, but i wanted > to post here as well with specific examples from the yocto manuals.) > > from the yocto dev manual, section 4.3.1: > > "The other method for creating a custom image is to modify an existing > image. For example, if a developer wants to add strace into the > core-image-sato image, they can use the following recipe: > > require core-image-sato.bb > > IMAGE_INSTALL += "strace" > > however, here's the discussion of IMAGE_INSTALL in the poky ref > manual in the variables glossary: > > "Using IMAGE_INSTALL with the += operator from the /conf/local.conf > file or from within an image recipe is not recommended as it can cause > ordering issues." > > ... and that explanation goes on to recommend using > IMAGE_INSTALL_append instead. that inconsistency should be cleared > up. >
The issue here is your talking about two different use cases. Setting IMAGE_INSTALL from a local.conf is a different use case then setting the value in a image recipe that includes another image recipe. >From the local.conf, just from a functional point of view generally will not work well if you do IMAGE_INSTALL +=. Some images(not neccisarily in oe-core) set IMAGE_INSTALL explictly hard, which means you can add what ever you want in your local.conf and it will get replaced with what is in the recipe. If the recipe sets IMAGE_INSTALL soft, then what happens is when your local.conf is read, the value should start out as not defined, so when you += to the value you get what ever you set as the only value. Later on when things like core-image attempt to set via =? it sees that it is already set and should break the image since it doesn't add what it thinks is the right stuff to make the image, just the stuff you set in your local.conf. If from the local.conf, you so IMAGE_INSTALL_append, what ever you set will get added after all the processing of the various settings for the image is already complete. In an image recipe, like the one you call out, all the image processing of what should be added etc, is alreaqdy done, when the =+ is added, so the result is what you would expect. Different use cases generally have different suggested methods. However this is more of a funcitonal discssion as I am not sure what the community consensus suggestions for setting things like IMAGE_INSTALL in local.conf is any more. _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
