PPC bool bitfield

[byteit101]

I was working on a library to make some tasks easier on the cRIO, and the library contained a bitfield that looks like this:

union ORArgs
{
	unsigned char Value;
	struct b
	{
		bool b0 : 1,
		b1 : 1, 
		b2 : 1, 
		b3 : 1, 
		b4 : 1, 
		b5 : 1, 
		b6 : 1, 
		b7 : 1;
	} Bits;
};

later, I read that bools are 4 bytes on a PPC system, which we have in the crio, and was wondering if the four bytes would cause undesired effects, like set b0,b1,b2, and b3 to true if b1 is set to true, but after thinking about it for a while, I thought that the first bit of bool b0 would equal the first bit of char Value, and the rest of the bits would be "discarded". unfortunately, I won't have access to the cRIO for another week. Is my first thought or second thought the true one?