CI: Add code coverage mesurement for powerpc-unknown-linux-gnu.

[briansmith]

Profiler builtins were added in rust-lang/rust#119404.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.81%. Comparing base (f69e502) to head (69c22b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1877      +/-   ##
==========================================
+ Coverage   96.27%   96.81%   +0.53%     
==========================================
  Files         143      143              
  Lines       20430    20436       +6     
  Branches      226      226              
==========================================
+ Hits        19669    19785     +116     
+ Misses        727      617     -110     
  Partials       34       34              

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[briansmith]

CI reports the following errors due to undefined symbol __atomic_fetch_add_8:

@ecnelises, do you have any ideas? It seems like we maybe need to change the Rust toolchain to add -latomic to the command line when building with profiler builtins, based on PurpleI2P/i2pd#285 (comment) and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81283? Or maybe otherwise implement the profiler builtins in a different way that doesn't require __atomic_fetch_add_8?

  = note: /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: bss-plt forced due to /home/runner/work/ring/ring/target/powerpc-unknown-linux-gnu/debug/deps/ring-b2bcec301c9e8d00.101za323lune3mo6.rcgu.o
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/target/powerpc-unknown-linux-gnu/debug/deps/ring-b2bcec301c9e8d00.101za323lune3mo6.rcgu.o: in function `<ring::aead::chacha::Key>::new':
          /home/runner/work/ring/ring/src/aead/chacha.rs:40: undefined reference to `__atomic_fetch_add_8'
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/target/powerpc-unknown-linux-gnu/debug/deps/ring-b2bcec301c9e8d00.101za323lune3mo6.rcgu.o: in function `<ring::aead::chacha::Key>::encrypt_in_place':
          /home/runner/work/ring/ring/src/aead/chacha.rs:48: undefined reference to `__atomic_fetch_add_8'
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/target/powerpc-unknown-linux-gnu/debug/deps/ring-b2bcec301c9e8d00.101za323lune3mo6.rcgu.o: in function `<ring::aead::chacha::Key>::encrypt_iv_xor_in_place':
          /home/runner/work/ring/ring/src/aead/chacha.rs:55: undefined reference to `__atomic_fetch_add_8'
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/src/aead/chacha.rs:55: undefined reference to `__atomic_fetch_add_8'
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/src/aead/chacha.rs:55: undefined reference to `__atomic_fetch_add_8'
          /usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld: /home/runner/work/ring/ring/target/powerpc-unknown-linux-gnu/debug/deps/ring-b2bcec301c9e8d00.101za323lune3mo6.rcgu.o:/home/runner/work/ring/ring/src/aead/chacha.rs:78: more undefined references to `__atomic_fetch_add_8' follow

[briansmith]

See also rust-lang/rust#69689 (comment) for another potential avenue to explore.

[briansmith]

See rust-lang/rust#112313 (comment)

[briansmith]

I have now implemented a workaround to get this to link, and Codecov.io reports that now the 32-bit specific AES and GCM code is now covered.