C1021: Bit field type is not 'int'

[ERROR]

Another type than 'int' was used for the bitfield declaration. Some Back Ends may support non-int bitfields, but only if the Compiler switch -Ansi is not given.

  struct {

  

    char b:1;

  

  } S;

  

Use int type for bitfields or remove the -Ansi from the Compiler options.

• C1106: Non-standard bitfield type