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Returning address of variable copied into lambda produces spurious warning. #17748

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llvmbot opened this issue Sep 26, 2013 · 1 comment
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Returning address of variable copied into lambda produces spurious warning. #17748

llvmbot opened this issue Sep 26, 2013 · 1 comment
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bugzilla Issues migrated from bugzilla c++11 clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer

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@llvmbot
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llvmbot commented Sep 26, 2013

Bugzilla Link 17374
Version 3.2
OS All
Reporter LLVM Bugzilla Contributor
CC @DougGregor

Extended Description

Given the following sample code:

int main()
{
int i;
auto f = =mutable->int*
{
return &i;
};

return 0;

}

The compiler reports "address of stack memory associated with local variable 'i' returned" for the 'i' in the lambda. That warning would be legitimate for a plain function but not for a lambda.

Note that this bug appears similar to bug #​16548 but it is not the same. Here, the variable is captured by value rather than by reference.
@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 9, 2021
@wheatman
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This was fixed between 3.4 and 3.5
https://godbolt.org/z/dvjTEWhjd

code

//compile with -std=c++11 -Wreturn-stack-address
int main()
{
    int i = 0;
    auto f = [=]()mutable->int*
    {
            return &i;
    };

    return 0;
}

old warning

<source>:7:21: warning: address of stack memory associated with local variable 'i' returned [-Wreturn-stack-address]
            return &i;
                    ^
1 warning generated.
Compiler returned: 0

@wheatman wheatman added the clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer label Sep 19, 2023
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bugzilla Issues migrated from bugzilla c++11 clang:diagnostics New/improved warning or error message in Clang, but not in clang-tidy or static analyzer
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