Include glib library in Makefile - c

Question

I'm not an expert of Makefile.
In my program I'm using hashtables of glib.h so in my Makefile I wrote this:
exec: bin/test
bin/test
clean:
rm -f build/* bin/*
CFLAGS = -g -Wall -Wpedantic -Wno-padded -O $(shell pkg-config --cflags --libs glib-2.0)
INCLUDES = include/*.h
COMMON_DEPS = $(INCLUDES) Makefile
build/%.o: src/%.c $(COMMON_DEPS)
$(CC) $(CFLAGS) -c $< -o $#
bin/test: /* functions.o*/ $(COMMON_DEPS)
$(CC) -o bin/test /* functions.o*/
But when I execute the Makefile I receive a list of these error messages:
...
functions.c: undefined reference to "g_str_hash"
functions.c: undefined reference to "g_str_equal"
...
I don't understand why

Answer 1

At the end I solved it in this way:
exec: bin/test
bin/test
clean:
rm -f build/* bin/*
CFLAGS = -g -Wall -Wpedantic -Wno-padded -O $(shell pkg-config --cflags glib-2.0)
LFLAGS = $(shell pkg-config --libs glib-2.0)
INCLUDES = include/*.h
COMMON_DEPS = $(INCLUDES) Makefile
build/%.o: src/%.c $(COMMON_DEPS)
$(CC) $(CFLAGS) -c $< -o $#
bin/test: /*functions.o */ $(COMMON_DEPS)
$(CC) -o bin/test /*functions.o */ $(LFLAGS)

Answer 2

The crux of the problem is that you're including the link flags in the compile command rather than the link command itself.
Remove --libs glib-2.0 from CFLAGS and add it to a new variable LFLAGS that can be used on the link line...
exec: bin/test
bin/test
clean:
rm -f build/* bin/*
CFLAGS = -g -Wall -Wpedantic -Wno-padded -O $(shell pkg-config --cflags glib-2.0)
LFLAGS = $(shell pkg-config --libs glib-2.0)
INCLUDES = include/*.h
COMMON_DEPS = $(INCLUDES) Makefile
build/%.o: src/%.c $(COMMON_DEPS)
$(CC) $(CFLAGS) -c $< -o $#
bin/test: /* functions.o*/ $(COMMON_DEPS)
$(CC) $(LFLAGS) -o bin/test /* functions.o*/
[Note: I've left the rest of the makefile untouched but the dependency specification for bin/test does look very odd.]