Add clang-format to c++ backend#262
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Apply Google-style clang-format to all generated .emb.h output, in both the bazel codegen path (emboss_codegen_cpp.main) and the standalone embossc driver. The clang-format binary path is resolved through the new compiler/back_end/cpp/clang_format_path module, which is the single seam to the underlying binary. The upstream version uses the clang-format PyPI package; downstream forks that cannot use the PyPI package can replace just clang_format_path.py and its BUILD entry with a shim returning an alternative path.
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robrussell
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May 21, 2026
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| def get_clang_format_path(): | ||
| """Returns the path to the clang-format executable.""" | ||
| from clang_format import get_executable |
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Generated C++ headers are now run through
clang-format --style=googlebeforebeing written out, so the output is consistent and readable instead of relying
on whitespace baked into the templates.
The clang-format binary is located via a small
clang_format_path.pyshim(with its own
py_librarytarget). The seam exists so downstream forks thatcan't use the upstream
clang-formatPyPI package can swap in their ownbinary by rewriting just that one file and its pip dep — nothing else in the
Emboss tree needs to change. The PyPI package itself is pinned at 22.1.5 in
requirements.txt.Most of the diff is regenerated goldens under
testdata/golden_cpp/. Thosechanges are purely formatting; no semantics moved.