[Bug c++/86181] New: static object mangling conflicts

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86181

            Bug ID: 86181
           Summary: static object mangling conflicts
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhonghao at pku dot org.cn
  Target Milestone: ---

I found that gcc+ produces errors when it compiles the following code:
extern "C" void abort();
static int i;
int *p = &i;
int main()
{ 
 int i;
 { 
 extern int i;
 i = 1;
 *p = 2;
 if (i == 2)
 abort ();
 }
 return 0;
}

When compiling the above code, clang++ does not produce any errors. The code
comes from https://bugs.llvm.org/show_bug.cgi?id=5966

Indeed, the situation is more complicated. The above bug report of clang says
that the code comes from a bug report of gcc:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775

The gcc report has a long discussion on this issue. Perhaps, the bug is not
fully fixed?