Auto merge of #99707 - JohnTitor:rollup-74rb8vq, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - #95040 (protect `std::io::Take::limit` from overflow in `read`)
 - #95916 (kmc-solid: Use `libc::abort` to abort a program)
 - #99494 (Use non-relocatable code in nofile-limit.rs test)
 - #99581 (Improve error messages involving `derive` and `packed`.)
 - #99643 (Add `sign-ext` target feature to the WASM target)
 - #99659 (Use `VecMap::get` in `ConstraintLocator::check`)
 - #99690 (add miri-track-caller to more intrinsic-exposing methods)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

3 files changed, 61 insertions, 47 deletions

diff --git a/src/test/ui/derives/deriving-with-repr-packed.rs b/src/test/ui/derives/deriving-with-repr-packed.rs
index b78eeaa9055..3884e397764 100644
--- a/src/test/ui/derives/deriving-with-repr-packed.rs
+++ b/src/test/ui/derives/deriving-with-repr-packed.rs
@@ -1,29 +1,43 @@
 #![deny(unaligned_references)]
 
-// check that derive on a packed struct with non-Copy fields
-// correctly. This can't be made to work perfectly because
-// we can't just use the field from the struct as it might
-// not be aligned.
+// Check that deriving certain builtin traits on certain packed structs cause
+// errors. This happens when the derived trait would need to use a potentially
+// misaligned reference. But there are two cases that are allowed:
+// - If all the fields within the struct meet the required alignment: 1 for
+//   `repr(packed)`, or `N` for `repr(packed(N))`.
+// - If `Default` is the only trait derived, because it doesn't involve any
+//   references.
 
-#[derive(Copy, Clone, PartialEq, Eq)]
-//~^ ERROR `#[derive]` can't be used
+#[derive(Copy, Clone, Default, PartialEq, Eq)]
+//~^ ERROR `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters
 //~| hard error
-//~^^^ ERROR `#[derive]` can't be used
+//~^^^ ERROR `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters
 //~| hard error
 #[repr(packed)]
 pub struct Foo<T>(T, T, T);
 
-#[derive(PartialEq, Eq)]
-//~^ ERROR `#[derive]` can't be used
+#[derive(Default, Hash)]
+//~^ ERROR `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy`
 //~| hard error
 #[repr(packed)]
 pub struct Bar(u32, u32, u32);
 
-#[derive(PartialEq)]
+// This one is fine because the field alignment is 1.
+#[derive(Default, Hash)]
+#[repr(packed)]
+pub struct Bar2(u8, i8, bool);
+
+// This one is fine because the field alignment is 2, matching `packed(2)`.
+#[derive(Default, Hash)]
+#[repr(packed(2))]
+pub struct Bar3(u16, i16, bool);
+
+// This one is fine because it's not packed.
+#[derive(Debug, Default)]
 struct Y(usize);
 
-#[derive(PartialEq)]
-//~^ ERROR `#[derive]` can't be used
+#[derive(Debug, Default)]
+//~^ ERROR `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy`
 //~| hard error
 #[repr(packed)]
 struct X(Y);
diff --git a/src/test/ui/derives/deriving-with-repr-packed.stderr b/src/test/ui/derives/deriving-with-repr-packed.stderr
index 1002b359f60..1f98da5b70e 100644
--- a/src/test/ui/derives/deriving-with-repr-packed.stderr
+++ b/src/test/ui/derives/deriving-with-repr-packed.stderr
@@ -1,7 +1,7 @@
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct with type or const parameters (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:8:16
+error: `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:11:16
    |
-LL | #[derive(Copy, Clone, PartialEq, Eq)]
+LL | #[derive(Copy, Clone, Default, PartialEq, Eq)]
    |                ^^^^^
    |
 note: the lint level is defined here
@@ -13,43 +13,43 @@ LL | #![deny(unaligned_references)]
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
    = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct with type or const parameters (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:8:23
+error: `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:11:32
    |
-LL | #[derive(Copy, Clone, PartialEq, Eq)]
-   |                       ^^^^^^^^^
+LL | #[derive(Copy, Clone, Default, PartialEq, Eq)]
+   |                                ^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
    = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct that does not derive Copy (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:16:10
+error: `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:19:19
    |
-LL | #[derive(PartialEq, Eq)]
-   |          ^^^^^^^^^
+LL | #[derive(Default, Hash)]
+   |                   ^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
-   = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct that does not derive Copy (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:25:10
+error: `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:39:10
    |
-LL | #[derive(PartialEq)]
-   |          ^^^^^^^^^
+LL | #[derive(Debug, Default)]
+   |          ^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
-   = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 4 previous errors
 
 Future incompatibility report: Future breakage diagnostic:
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct with type or const parameters (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:8:16
+error: `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:11:16
    |
-LL | #[derive(Copy, Clone, PartialEq, Eq)]
+LL | #[derive(Copy, Clone, Default, PartialEq, Eq)]
    |                ^^^^^
    |
 note: the lint level is defined here
@@ -62,11 +62,11 @@ LL | #![deny(unaligned_references)]
    = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 Future breakage diagnostic:
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct with type or const parameters (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:8:23
+error: `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:11:32
    |
-LL | #[derive(Copy, Clone, PartialEq, Eq)]
-   |                       ^^^^^^^^^
+LL | #[derive(Copy, Clone, Default, PartialEq, Eq)]
+   |                                ^^^^^^^^^
    |
 note: the lint level is defined here
   --> $DIR/deriving-with-repr-packed.rs:1:9
@@ -78,11 +78,11 @@ LL | #![deny(unaligned_references)]
    = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 Future breakage diagnostic:
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct that does not derive Copy (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:16:10
+error: `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:19:19
    |
-LL | #[derive(PartialEq, Eq)]
-   |          ^^^^^^^^^
+LL | #[derive(Default, Hash)]
+   |                   ^^^^
    |
 note: the lint level is defined here
   --> $DIR/deriving-with-repr-packed.rs:1:9
@@ -91,14 +91,14 @@ LL | #![deny(unaligned_references)]
    |         ^^^^^^^^^^^^^^^^^^^^
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
-   = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 Future breakage diagnostic:
-error: `#[derive]` can't be used on a `#[repr(packed)]` struct that does not derive Copy (error E0133)
-  --> $DIR/deriving-with-repr-packed.rs:25:10
+error: `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` (error E0133)
+  --> $DIR/deriving-with-repr-packed.rs:39:10
    |
-LL | #[derive(PartialEq)]
-   |          ^^^^^^^^^
+LL | #[derive(Debug, Default)]
+   |          ^^^^^
    |
 note: the lint level is defined here
   --> $DIR/deriving-with-repr-packed.rs:1:9
@@ -107,5 +107,5 @@ LL | #![deny(unaligned_references)]
    |         ^^^^^^^^^^^^^^^^^^^^
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
-   = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
 
diff --git a/src/test/ui/process/nofile-limit.rs b/src/test/ui/process/nofile-limit.rs
index 549135a46cf..3ddf8d6ef24 100644
--- a/src/test/ui/process/nofile-limit.rs
+++ b/src/test/ui/process/nofile-limit.rs
@@ -6,7 +6,7 @@
 // dont-check-compiler-stderr
 // only-linux
 // no-prefer-dynamic
-// compile-flags: -Ctarget-feature=+crt-static -Crpath=no
+// compile-flags: -Ctarget-feature=+crt-static -Crpath=no -Crelocation-model=static
 #![feature(exit_status_error)]
 #![feature(rustc_private)]
 extern crate libc;