Une remarque sur le degre formel d'une serie discrete d'un groupe lineaire general p-adique

I show by the example of the general linear group, how one can deduce from my previous work “Decomposition spectrale d’un groupe reductif $p$-adique” (to appear in Journal of the Institute of Mathematics of Jussieu) precise information on the formal degree of a square integrable representation of a $p$-adic group.