[llvm-bugs] [Bug 39336] New: init-capture of initializer_list fails to extend lifetime

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39336

            Bug ID: 39336
           Summary: init-capture of initializer_list fails to extend
                    lifetime
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Keywords: miscompilation
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: llvm-bugs at lists.llvm.org

Similar to PR 24164, but expressed using an initializer_list captured by value.
Clang does not extend the lifetime of the temporary array to the lifetime of
the init-capture. GCC does extend the lifetime.


### SOURCE (<stdin>):
#include <initializer_list>
extern "C" int printf(const char *, ...);

struct A {
  A() = default;
  A(const A &) = default;
  ~A() { printf("%s\n", __PRETTY_FUNCTION__); }
};

int main(void) {
  A a;
  [list = { a }] { printf("Hi.\n"); }();
}


### COMPILER INVOCATION:
clang++ -xc++ -std=c++14 -o prog -


### RUN INVOCATION:
./prog


### ACTUAL RUN OUTPUT:
A::~A()
Hi.
A::~A()


### EXPECTED RUN OUTPUT:
A::~A()
A::~A()
Hi.


### COMPILER VERSION INFO (clang++ -v):
clang version 8.0.0 (https://github.com/llvm-mirror/clang.git
bcda707b20ee8c1ad0ce4e9503c761c85e6ce624)
(https://github.com/llvm-mirror/llvm.git
4998e62d5745cca132cf92cec718be0746e70bcf)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64

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