Thanks @dBC, that sounds great, looking forward to hearing more about how it develops.
I’ve now amended my test code to print out, Vrms, Irms, realPower, apparentPower and powerFactor as floats with the makefile modifications you mentioned.
BINPATH = /usr/bin
CFLAGS += -std=gnu99
LDFLAGS += -Xlinker --no-wchar-size-warning -u _printf_float