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attribute.
Compiler MCP:
https://github.com/rust-lang/compiler-team/issues/565
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This ensures that the error is printed even for unused variables,
as well as unifying the handling between the LLVM and GCC backends.
This also fixes unusual behavior around exported Rust-defined variables
with linkage attributes. With the previous behavior, it appears to be
impossible to define such a variable such that it can actually be imported
and used by another crate. This is because on the importing side, the
variable is required to be a pointer, but on the exporting side, the
type checker rejects static variables of pointer type because they do
not implement `Sync`. Even if it were possible to import such a type, it
appears that code generation on the importing side would add an unexpected
additional level of pointer indirection, which would break type safety.
This highlighted that the semantics of linkage on Rust-defined variables
is different to linkage on foreign items. As such, we now model the
difference with two different codegen attributes: linkage for Rust-defined
variables, and import_linkage for foreign items.
This change gives semantics to the test
src/test/ui/linkage-attr/auxiliary/def_illtyped_external.rs which was
previously expected to fail to compile. Therefore, convert it into a
test that is expected to successfully compile.
The update to the GCC backend is speculative and untested.
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It checked for a "not found", but on WSL with appendWindowsPath=true,
PermissionDenied is the error instead.
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reduce threads spawned by ui-tests
The test harness already spawns enough tests to keep all cores busy.
Individual tests should keep their own threading to a minimum to avoid context switch overhead.
When running ui tests with lld enabled this shaves about 10% off that testsuite on my machine.
Resolves #81946
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the test harness already spawns enough tests for all cores, individual
tests should keep their own threading to a minimum to avoid context switch
overhead
some tests fail with 1 CGU, so explicit compile flags have been added
to keep their old behavior
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https://github.com/rust-lang/rust/issues/60532
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Fix #61232
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Update pre-existing test's diagnostic output accordingly.
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