packed type cannot transitively contain a #[repr(align)] type
#2179
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rust-for-linux
Issues relevant to the Rust for Linux project
Comments
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I'm getting a similar error when trying to build https://github.com/nviennot/tinyusb-sys-rs.git I'm building with: I get these errors Where the source looks like |
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Seen by the kernel as well at: https://lore.kernel.org/all/[email protected]/ struct alt_instr {
s32 instr_offset; /* original instruction */
s32 repl_offset; /* offset to replacement instruction */
union {
struct {
u32 cpuid: 16; /* CPUID bit set for replacement */
u32 flags: 16; /* patching control flags */
};
u32 ft_flgs;
};
u8 instrlen; /* length of original instruction */
u8 replacementlen; /* length of new instruction */
} __packed; |
27 tasks
This was referenced Apr 10, 2023
MozhuCY
added a commit
to MozhuCY/osx-sys
that referenced
this issue
Apr 19, 2023
Added to blocklist until closed by rust-lang/rust-bindgen#2179
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Encountered the same problem when binding spdk. #include <stdint.h>
struct __attribute__((packed)) spdk_nvme_sgl_descriptor {
uint64_t address;
union {
struct {
uint8_t reserved[7];
uint8_t subtype : 4;
uint8_t type : 4;
} generic;
struct {
uint32_t length;
uint8_t reserved[3];
uint8_t subtype : 4;
uint8_t type : 4;
} unkeyed;
struct {
uint64_t length : 24;
uint64_t key : 32;
uint64_t subtype : 4;
uint64_t type : 4;
} keyed;
};
}; |
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Any solution? |
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Here is a simple breakdown of the actual issue at hand. It looks the rust compiler can't align and pack at the same time which is causing the issue. #[derive(Debug, Clone, Copy)]
#[repr(C, packed(2))]
struct PackedAlignedTest {
a: u32,
b: u16,
inner: PackedAlignedInnerTest,
}
#[derive(Debug, Clone, Copy)]
#[repr(C, align(2))]
struct PackedAlignedInnerTest {
c: u32,
d: u16,
}
fn main() {
let packed_aligned_test = PackedAlignedTest {
a: 0,
b: 1,
inner: PackedAlignedInnerTest {
c: 2,
d: 3
}
};
println!("{packed_aligned_test:#?}");
}From what I can tell there was an oversight in this issue: rust-lang/rust#33158
This was never resolved and missed in review. |
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Encountered the same problem when binding spdk. |
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o(╥﹏╥)o same problem when binding spdk, and another problem: error[E0428]: the name FP_NAN is defined multiple times |
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@xxxmailk the multiple |
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Input C/C++ Header
Bindgen Invocation
Actual Results
Expected Results
compile successfully. If bitfields are removed and or packed is removed this work.
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