[Bug c++/104635] New: for loop optimized into infinite loop

[szullo.adam at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104635

            Bug ID: 104635
           Summary: for loop optimized into infinite loop
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: szullo.adam at gmail dot com
  Target Milestone: ---

compiling with g++, optimization (other than -O0) turn for loop into infinite
loop

#include <stdio.h>
int test()
{
        for (int i=0; i<4; i++)
        {
                printf("%d\n",i);
        }
}
int main()
{
        test();
}

i DO ACKNOWLEDGE, that (contrary to c) in c++ missing return value is invalid
(-Wreturn-type)

Expected behaviour:
return with garbage value
-or-
segfault on return
// or maybe instead of warning, throw error