Neither means "what do you mean" (Qu’est-ce que tu veux dire ?).
The first one, "Qu’est-ce qui te fait le dire ?" can’t be but a question: "What makes you say it?"
The second one, "Ce qui te fait le dire", is a statement and is usually a part of a whole sentence like "C’est ce qui te fait le dire": "It is what makes you say it".
The register is formal/literary, although Qu’est-ce qui te le fait dire is even more.
In spoken French, you most likely hear:
Qu’est-ce qui te fait dire ça ? / Ce qui te fait dire ça
Leave a comment