https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121677
Bug ID: 121677
Summary: Lambda implementation leaks out to user code
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: csaba_22 at yahoo dot co.uk
Target Milestone: ---
The following code compiles and returns zero:
int main()
{
int i = 42;
auto f = [&i] () { return i * 2; }; // not called
f.__i = 13;
return i != 13;
}
This should not happen. __i is not defined anywhere (clang and msvc reject the
code because of this). User code should not have access to the internal
implementation of lambdas.
This goes back to at least GCC 5, and is still present in GCC 15 (and even
trunk)
https://godbolt.org/z/aEaEeabav
