{Makefile Error} “commands commence before first target. Stop.”

Question

I\'m trying to produce a makefile for use with my Raspberry Pi, the intention is to use the Pi\'s camera board to detect faces with opencv. However I keep facing myself wit

Answer 1

Smth like:

FLAGS = 'pkg-config --cflags opencv --libs opencv'
CC = g++
HOME = /home/pi
LDFLAGS_CAMCV = -L$(HOME)/git/robidouille/raspicam_cv -lraspicamcv
LDFLAGS_USER =-L$(HOME)/git/raspberrypi/userland/build/lib -lmmal_core -lmmal -$
LDFLAGS_FACE = -l$(HOME)/git/emobot/libfacere0.04
LDFLAGS = $(LDFLAGS_CAMCV) $(LDFLAGS_USER)  $(LDFLAGS_FACE)
INCLUDE = -I$(HOME)/git/robidouille/raspicam_cv

all: emobot_test

emobot_test:
tab$(CC) -o emobot_test.exe  main.cpp $(INCLUDE) $(LDFLAGS)

<tab> is a literal keypress, donna how to insert it in the answer field.

Explanation:
$(CC) -o emobot_test... is a command which should be executed upon a target invocation.

all is the default target which is executed when you simply run make without parameters.

all depends on emobot_test target emobot_test doesn't depend on any target but always runs $(CC) -o emobot_test... for completion

Answer 2

I had the same issue ...

I already have rules for check, test and build... but wanted to string them together...

Easy I thought...

.DEFAULT_GOAL := fullcheck
    $(MAKE) check
    $(MAKE) test
    $(MAKE) build

But no commands commence before first target. Stop.

What I had omitted was, the name of the rule. It should be like this.

.DEFAULT_GOAL := fullcheck
fullcheck:
    $(MAKE) check
    $(MAKE) test
    $(MAKE) build