Can't Log information about a double

[Mattia Milani]

Hello all,

I'm trying to log some information during the bird process execution.
I'm doing it in the bgp section.

I used the command:

log(L_INFO "** some text **");

with success, i added to the log some information about an integer variable
with success, here it is the code:

int a = 5;
log(L_INFO "** some text ** %d", a);

Now i'm trying to make the same with a double variable but without success

double a = 5.5;
log(L_INFO "** some text ** %lf", a);

the output was:

2018-03-30 18:09:12.270 <INFO> ** some text ** %f

I had already tried with %f instead of %lf but nothing changed in the output

How can i log some double value? i need to use another function instead of
log()?

Thanks,
Mattia
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