Makefile Tricks: Arithmetic – Addition, Subtraction, Multiplication, Division, Modulo, Comparison

Makefile Tricks

NUMBER1 := 10
NUMBER2 := 5

#Addition
ADD := $(shell echo ${NUMBER1}+${NUMBER2} | bc)

#Subtraction
SUBTRACT := $(shell echo ${NUMBER1}-${NUMBER2} | bc)

#Multiplication
MULTIPLY := $(shell echo ${NUMBER1}*${NUMBER2} | bc)

#Division
DIVIDE := $(shell echo ${NUMBER1}/${NUMBER2} | bc)

#Division (Floating Point)
DIVIDEF := $(shell echo "scale=3; ${NUMBER2}/${NUMBER1}" | bc)

#Modulo
MODULO := $(shell echo ${NUMBER1}%${NUMBER2} | bc)

#Comparison Greater Than
COMPARISON1 := $(shell echo ${NUMBER1}\>=${NUMBER2} | bc)

#Comparison Smaller Than
COMPARISON2 := $(shell echo ${NUMBER2}\<=${NUMBER2} | bc)

all:
  @echo Addition ${ADD}
  @echo Subtraction ${SUBTRACT}
  @echo Multiplication ${MULTIPLY}
  @echo Division ${DIVIDE}
  @echo Division  - Floating Point ${DIVIDEF}
  @echo Modulo ${MODULO}
  @echo Comparison Greater Than ${COMPARISON1}
  @echo Comparison Smaller Than ${COMPARISON2}