[Bug default/22971] RFE: Support <xi:include> for managing abixml documents.

["carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22971

--- Comment #3 from Carlos O'Donell <carlos at redhat dot com> ---
Example of what I'm thinking about:

abi/x86_64/libc.so.6.abi.xml

<abi-corpus path='./lib64/libc-2.27.9000.so' architecture='elf-amd-x86_64'
soname='libc.so.6'>
  <elf-needed>
    <dependency name='ld-linux-x86-64.so.2'/>
  </elf-needed>
  <elf-function-symbols>
    ...
  </elf-function-symbols>
  <!-- Include new elf function symbols in downstream. -->
  <xi:include href="../final-abi/x86_64/libc.so.6.efs.abi.xml"/>
  ...
</abi-corpus>

final-abi/x86_64/libc.so.6.efs.abi.xml

<elf-function-symbols>
  ... List of all new elf function symbols
</elf-functions-symbols>

Delta file suggestion:

abi/x86_64/libc.so.6.abi.xml

<abi-corpus path='./lib64/libc-2.27.9000.so' architecture='elf-amd-x86_64'
soname='libc.so.6'>
  <elf-needed>
    <dependency name='ld-linux-x86-64.so.2'/>
  </elf-needed>
  <elf-function-symbols>
    ...
  </elf-function-symbols>
  ...
</abi-corpus>

final-abi/x86_64/libc.so.6.abi.xml

<abi-corpus path='./lib64/libc-2.28.so' architecture='elf-amd-x86_64'
soname='libc.so.6'>
  <!-- Include baseline upstream corpus. -->
  <xi:include href="../abi/x86_64/libc.so.6.abi.xml"/>
  <elf-needed>
    <dependency name='ld-linux-x86-64.so.2'/>
  </elf-needed>
  <elf-function-symbols>
    ...
    <!-- The following symbols are removed from the baseline.  -->
    <elf-symbol-removed name='_IO_2_1_stderr_' size='224' version='GLIBC_2.2.5'
is-default-version='yes' type='object-type' binding='global-binding'
visibility='default-visibility' is-defined='yes'/>
  </elf-function-symbols>
  ...
</abi-corpus>

* Requires support for nested <abi-corpus>
* Requires support for override/deltion of ABI elements.

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