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scx_lavd: use c_char consistently #246

Merged
merged 1 commit into from
Apr 27, 2024
Merged

scx_lavd: use c_char consistently #246

merged 1 commit into from
Apr 27, 2024

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arighi
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@arighi arighi commented Apr 27, 2024

In Rust c_char can be aliased to i8 or u8, depending on the particular target architecture.

For example, trying to build scx_lavd on ppc64 triggers the following error:

error[E0308]: mismatched types
--> src/main.rs:200:38
|
200 | let c_tx_cm: *const c_char = (&tx.comm as *const [i8; 17]) as *const i8;
| ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected *const u8, found *const i8
| |
| expected due to this
|
= note: expected raw pointer *const u8
found raw pointer *const i8

To fix this, consistently use c_char instead of assuming it corresponds to i8.

In Rust c_char can be aliased to i8 or u8, depending on the particular
target architecture.

For example, trying to build scx_lavd on ppc64 triggers the following
error:

error[E0308]: mismatched types
   --> src/main.rs:200:38
    |
200 |         let c_tx_cm: *const c_char = (&tx.comm as *const [i8; 17]) as *const i8;
    |                      -------------   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*const u8`, found `*const i8`
    |                      |
    |                      expected due to this
    |
    = note: expected raw pointer `*const u8`
               found raw pointer `*const i8`

To fix this, consistently use c_char instead of assuming it corresponds
to i8.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
@arighi arighi requested a review from multics69 April 27, 2024 15:29
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@multics69 multics69 left a comment

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Looks good! Thank you for trying lavd on PPC64.

@multics69 multics69 merged commit 0495a52 into main Apr 27, 2024
1 check passed
@multics69 multics69 deleted the lavd-fix-arch-build branch April 27, 2024 15:49
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2 participants