Description of problem:
When compiling a program using C++, std::string, openmp and a parallel (not parallel for) directive, I get an internal compiler error.

Version-Release number of selected component (if applicable):
g++ (GCC) 6.1.1 20160621 (Red Hat 6.1.1-3)

Steps to Reproduce:
1. Save the following code in a file test.C:

#include <string>
int main() {
    std::string s = "";
#pragma omp parallel
    {
        while (true) {
            printf(".");
        }
    }
}

2. Compile with the following command:
g++ -fopenmp -O2 -Wall -o test test.C

Actual results:
test.C: In function ‘int main()’:
test.C:10:1: internal compiler error: Segmentation fault
 }
 ^

Expected results:
A valid executable file.

Additional info:
I can reproduce this error also with g++ 6.2.0 from gcc.gnu.org.