modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/20181114-1.c (about)

     1  int
     2  _vfprintf_r (double fp)
     3  {
     4    if (__builtin_signbit (fp))
     5      return '-';
     6  }