C4100: Converted bit field signed -1 to 1 in comparison

[WARNING]

A signed bitfield entry of size 1 can only have the values 0 and -1. The compiler did find a comparison of such a value with 1. The compiler did use -1 instead to generate the expected code.

  struct A {

  

    int i:1;

  

  } a;

  

  void f(void);

  

  void main(void) {

  

    if (a.i == 1) {

  

      f();

  

    }

  

  }

  

Correct the source code. Either use an unsigned bitfield entry or compare the value to -1.