================
@@ -388,6 +388,34 @@ pointer, but not any provenance of the allocation:
}];
}
+def WarnUnusedDocs : Documentation {
+ let Category = DocCatType;
+ let Content = [{
+The ``warn_unused`` attribute can be placed on the declaration of a structure
or union type.
+When the ``-Wunused-variable`` diagnostic is enabled, local variables of types
which have a non-trivial constructor or destructor are considered "used" by
virtue of the constructor or destructor invocations involved.
+Declaring the type with the ``warn_unused`` attribute strengthens the "use"
requirements to require a direct access to the variable, such as passing it as
an argument to a call, calling a member function on it, taking the address of
it, etc.
----------------
AaronBallman wrote:
Is this a bit better?
Btw, I ended up filing https://github.com/llvm/llvm-project/issues/202326 while
updating the docs in case you're wondering about "outside of its declaration"
and whether the initialization counts or not.
https://github.com/llvm/llvm-project/pull/201881
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