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Stuart Cook ef8003bbb9 Rollup merge of #147185 - RalfJung:repr-c-not-zst, r=petrochenkov 
repr(transparent): do not consider repr(C) types to be 1-ZST

Context: https://github.com/rust-lang/unsafe-code-guidelines/issues/552

This experiments with a [suggestion](https://github.com/rust-lang/rfcs/pull/3845#discussion_r2388463698) by ```@RustyYato``` to stop considering repr(C) types as 1-ZST for the purpose of repr(transparent). If we go with https://github.com/rust-lang/rfcs/pull/3845 (or another approach for fixing repr(C)), they will anyway not be ZST on all targets any more, so this removes a portability hazard. Furthermore, zero-sized repr(C) structs [may have to be treated](https://github.com/rust-lang/unsafe-code-guidelines/issues/552#issuecomment-3250657813) as non-ZST for the win64 ABI (at least that's what gcc/clang do), so allowing them to be ignored in repr(transparent) types is not entirely coherent.

Turns out we already have an FCW for repr(transparent), namely https://github.com/rust-lang/rust/issues/78586. This extends that lint to also check for repr(C).
2025-10-28 20:39:32 +11:00
..
auxiliary
Add test batch 5
2025-10-12 00:33:20 -04:00
16-bit-repr-c-enum.rs
remove some unnecessary feature(lang_items)
2025-10-19 13:44:07 +02:00
align-with-extern-c-fn.rs
…
aligned_enum_cast.rs
…
attr-usage-repr.rs
Update uitests with new unused_attributes warnings
2025-10-18 21:17:48 +02:00
attr-usage-repr.stderr
Update uitests with new unused_attributes warnings
2025-10-18 21:17:48 +02:00
conflicting-repr-hints.rs
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conflicting-repr-hints.stderr
bless tests with new lint messages
2025-08-19 21:27:10 +02:00
explicit-rust-repr-conflicts.rs
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explicit-rust-repr-conflicts.stderr
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invalid_repr_list_help.rs
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invalid_repr_list_help.stderr
Add link to invalid repr error
2025-08-11 16:00:49 +00:00
invalid-repr-on-structs-74082.rs
Add test batch 5
2025-10-12 00:33:20 -04:00
invalid-repr-on-structs-74082.stderr
Add test batch 5
2025-10-12 00:33:20 -04:00
issue-83505-repr-simd.rs
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issue-83505-repr-simd.stderr
Fix test output expectations
2025-02-24 14:31:19 +01:00
malformed-repr-hints.rs
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malformed-repr-hints.stderr
add #[align] attribute
2025-06-18 12:37:08 +02:00
packed-struct-contains-aligned-type-73112.rs
Add test batch 5
2025-10-12 00:33:20 -04:00
packed-struct-contains-aligned-type-73112.stderr
Add test batch 5
2025-10-12 00:33:20 -04:00
packed-struct-with-enum-53728.rs
Add test batch 2
2025-08-27 15:06:05 -04:00
repr_align_greater_usize.msp430.stderr
tests: use minicore more
2025-02-24 09:26:54 +00:00
repr_align_greater_usize.rs
remove some unnecessary feature(lang_items)
2025-10-19 13:44:07 +02:00
repr_c_int_align.rs
…
repr-align-assign.fixed
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr-align-assign.rs
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr-align-assign.stderr
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr-align.rs
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr-align.stderr
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr-c-dead-variants.aarch64-unknown-linux-gnu.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
repr-c-dead-variants.armebv7r-none-eabi.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
repr-c-dead-variants.i686-pc-windows-msvc.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
repr-c-dead-variants.rs
remove some unnecessary feature(lang_items)
2025-10-19 13:44:07 +02:00
repr-c-dead-variants.x86_64-unknown-linux-gnu.stderr
Ignore more failing ui tests for GCC backend
2025-10-13 15:30:26 +02:00
repr-c-int-dead-variants.rs
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repr-c-int-dead-variants.stderr
Remove rustc's notion of "preferred" alignment AKA __alignof
2025-06-08 16:41:46 -07:00
repr-disallow-on-variant.rs
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repr-disallow-on-variant.stderr
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repr-empty-packed.rs
continue to check attr if meet empty repr for adt
2025-03-09 10:51:50 +08:00
repr-empty-packed.stderr
improve empty attribute diagnostic
2025-09-27 19:32:14 +02:00
repr-packed-contains-align.rs
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repr-packed-contains-align.stderr
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repr-transparent-issue-87496.rs
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repr-transparent-issue-87496.stderr
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repr-transparent-non-exhaustive-transparent-in-prose.rs
repr(transparent): do not consider repr(C) types to be 1-ZST
2025-10-27 19:25:14 +01:00
repr-transparent-non-exhaustive.rs
repr(transparent): do not consider repr(C) types to be 1-ZST
2025-10-27 19:25:14 +01:00
repr-transparent-non-exhaustive.stderr
repr(transparent): do not consider repr(C) types to be 1-ZST
2025-10-27 19:25:14 +01:00
repr-transparent-other-items.rs
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repr-transparent-other-items.stderr
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repr-transparent-other-reprs.rs
…
repr-transparent-other-reprs.stderr
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repr-transparent-repr-c.rs
repr(transparent): do not consider repr(C) types to be 1-ZST
2025-10-27 19:25:14 +01:00
repr-transparent-repr-c.stderr
repr(transparent): do not consider repr(C) types to be 1-ZST
2025-10-27 19:25:14 +01:00
repr-transparent.rs
…
repr-transparent.stderr
Fix test output expectations
2025-02-24 14:31:19 +01:00
repr.rs
…
repr.stderr
Add more docs to templates for attrs with incorrect arguments
2025-08-11 17:02:32 +00:00
transparent-enum-too-many-variants.rs
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transparent-enum-too-many-variants.stderr
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