[llvm-bugs] [Bug 47702] New: auto function return the reference of a local variable not the value

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47702

            Bug ID: 47702
           Summary: auto function return the reference of a local variable
                    not the value
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tangyixuan at mail.dlut.edu.cn
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Hi, the following code returns the value of a local variable instead of the
reference address. At first I though it was a gcc bug and reported it to gcc.
Maybe  is miscompiled by clang.

#include <iostream>
auto func(const int a) {
  const int b = a;
  return [&](){ return b; };
}


int main() {
  auto c = func(1);
  std::cout << c() ;
  return 0;
}

$ g++ -std=c++2a s.cpp
$ ./a.out
32765


$ clang++ -std=c++2a s.cpp
$ ./a.out
1

reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97256

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