Commits on Jan 8, 2023

1. linker: add Kconfig option to enable --build-id …

   Adds a Kconfig option to enable the generation of the GNU build ID from
   the final `zephyr.elf` file. This build ID can be used to uniquely
   identify a firmware image.
   
   The `--build-id` option is available for the `ld` and `ldd` linkers,
   which are used by all in-tree compilers except `arcmwdt` and `armclang`.
   
   Inspired by the following blog post:
     https://interrupt.memfault.com/blog/gnu-build-id-for-firmware
   
   Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

   Jordan Yates committed Jan 8, 2023
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2. kernel: version: helper to extract GNU build ID …

   Adds a helper to `zephyr/kernel_version.h` to retrieve the GNU build ID.
   
   Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

   Jordan Yates committed Jan 8, 2023
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3. tests: kernel: test sys_gnu_build_id_get …

   Test that `sys_gnu_build_id_get` returns a valid pointer, and the entire
   hash is not 0. The expected structure of the .elf note is validated by
   an assert inside the function implementation.
   
   Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

   Jordan Yates committed Jan 8, 2023
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