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ci: switch to Cargo build.warnings #6212

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ci: switch to Cargo build.warnings #6212

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5 changes: 4 additions & 1 deletion .github/workflows/build.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -135,5 +135,8 @@ jobs:
env:
CARGO_TERM_VERBOSE: ${{ inputs.verbose }}
RUST_BACKTRACE: 1
RUSTFLAGS: "-D warnings"
# `build.warnings` avoids the cache-busting from `RUSTFLAGS`; respected on
# Cargo 1.97+ only (MSRV jobs fall back to warn). rustdoc isn't covered by
# it, so RUSTDOCFLAGS stays.
CARGO_BUILD_WARNINGS: deny
RUSTDOCFLAGS: "-D warnings"
6 changes: 3 additions & 3 deletions noxfile.py
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Expand Up @@ -1665,10 +1665,10 @@ def check_feature_powerset(session: nox.Session):
*abi3t_version_features,
]

# deny warnings
# deny warnings; `build.warnings` avoids the cache-busting from `RUSTFLAGS`
# and is respected on Cargo 1.97+ only (MSRV falls back to warn).
env = os.environ.copy()
rust_flags = env.get("RUSTFLAGS", "")
env["RUSTFLAGS"] = f"{rust_flags} -Dwarnings"
env["CARGO_BUILD_WARNINGS"] = "deny"

subcommand = "hack"
if "minimal-versions" in session.posargs:
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