[llvm-bugs] [Bug 38236] New: flexible array member in an otherwise empty struct

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38236

            Bug ID: 38236
           Summary: flexible array member in an otherwise empty struct
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The code is as follow:

struct ordered_tasks
{
 int * pop ();
};

struct A
{
 ordered_tasks * tasks[];
 int * pop ();
};

int pop_first_bucket;

int * A::pop ()
{
 int * out;
 int cur_bucket = 0;

 do {
 if (tasks[0]) {
 out = tasks[cur_bucket]->pop();
 if (out)
 return out;
 }
 } while (pop_first_bucket);

 return 0;
}

clang++ accepts the code, but g++ rejects it:

code0.cpp:8:24: error: flexible array member 'A::tasks' in an otherwise empty
'struct A'
  ordered_tasks * tasks[];
                        ^

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