modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/pr27341-1.c (about)

     1  extern double R_NaReal;
     2  void z_atan2 (double _Complex * r, double _Complex * ccs)
     3  {
     4      if (*ccs == 0)
     5          __imag__ *r = R_NaReal;
     6  }
     7