[llvm-bugs] [Bug 48606] Clang rejects creation of struct with mutable member during constant evaluation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48606

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Fixed By Commit(s)|                            |21e8bb83253e1a2f4b6fad9b53c
                   |                            |afe8c530a38e2,
                   |                            |8153dee37272a73b1ed74ac1bc1
                   |                            |2422fac8ef033
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Simpler testcase:

struct WithMutable {
    mutable int val_{0};
};

constexpr void createOnHeap() {
    WithMutable* var = new WithMutable{};
    var->val_ = 1;
    delete var;
}

Clang was not treating heap allocations as "lifetime started within the current
evaluation" for the purpose of determining whether 'mutable' prevents the
subobject from being used in the constant expression.

Fixed and backported to 12.0 release branch.

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