# Working of recipes on Ubuntu toolchain

Source: [https://docs.qualcomm.com/doc/80-88500-2/topic/21_Working_of_recipes_on_Ubuntu_toolchain.html](https://docs.qualcomm.com/doc/80-88500-2/topic/21_Working_of_recipes_on_Ubuntu_toolchain.html)

The working procedure of recipes on an Ubuntu toolchain is as follows:
      
1. The Download-manager-native.bb file scans all recipes in recipe-packages that ends with -sysroot.bb.
2. The Download-manager-native.bb file downloads the package link inside the recipes and decompresses them into `EXTERNAL_TOOLCHAIN`.
3. The value of `EXTERNAL_TOOLCHAIN` is <src>/downloads.
4. ubuntu-toolchain.bb copies the packages into ${D}, which is a standard value of Yocto. And the value of `${D}` is <src>/build-qti-distro-Ubuntu-debug/tmp-glibc/work/aarch64-oe-linux/ubuntu-toolchain/0-r0/image.
          
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5. As all recipes depend on `libc` and if the provider of `libc` has already switched to the Ubuntu toolchain, then all the recipes require ubuntu-toolchain.bb.
6. The ubuntu-toolchain.bb file collects the necessary dependencies and is leveraged in the build process of each recipe.
7. If the package links are invalid, update them. If there are missing dependencies for new added recipes, see Develop the application with an Ubuntu toolchain in Yocto and Working of recipes on Ubuntu toolchain.

**Parent Topic:** Toolchain (Linux Ubuntu)

Last Published: Aug 18, 2023

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Example of adding new recipes for Ubuntu toolchain