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rust: cargo: store desired warning levels in workspace Cargo.toml

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An extra benefit of workspaces is that they allow to place lint level
settings in a single Cargo.toml; the settings are then inherited by
packages in the workspace.

Correspondingly, teach rustc_args.py to get the unexpected_cfgs
configuration from the workspace Cargo.toml.

Note that it is still possible to allow or deny warnings per crate or
module, via the #![] attribute syntax.  The rust/qemu-api/src/bindings.rs
file is an example.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-11-06 13:03:45 +01:00
parent 97ed1e9c8e
commit 90868c3dce
7 changed files with 53 additions and 13 deletions
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7
meson.build
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@ -121,11 +121,12 @@ endif
if have_rust
rustc_args = [find_program('scripts/rust/rustc_args.py'),
'--rustc-version', rustc.version()]
'--rustc-version', rustc.version(),
'--workspace', meson.project_source_root() / 'rust']
rustfmt = find_program('rustfmt', required: false)
# Prohibit code that is forbidden in Rust 2024
rustc_lint_args = ['-D', 'unsafe_op_in_unsafe_fn']
rustc_lint_args = run_command(rustc_args, '--lints',
capture: true, check: true).stdout().strip().splitlines()
# Occasionally, we may need to silence warnings and clippy lints that
# were only introduced in newer Rust compiler versions. Do not croak