compiling makefile - error

hi ,

I've a problem compiling my makefile.
the additional files are enclosed.

the error I get:
$make ./main
gcc -ggdb main.c
/tmp/ccPIxwjP.o: In function `main':
/home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:6: undefined reference to `func1'
/home/ilan/Embedded_linux/Lesson-2-Makefiles/lesson-2.1/main.c:7: undefined reference to `func2'
collect2: error: ld returned 1 exit status
make: *** [main.o] Error 1
$

Code:

my make file:

main : main.o file1.o file2.o
    gcc -ggdb main.o file1.o file2.o -o gdb-main 

main.o : main.c file1.h file2.h
    gcc -ggdb main.c

file1.o:file1.c file1.h
    gcc -ggdb file1.c

file2.o:file2.c file2.h
    gcc -ggdb file2.c


PHONY : clean

clean :
    rm *.o

thanks
Ilan

./main isn't a rule in your makefile. You want “make main”.

Code:

main : main.o file1.o file2.o
    gcc -ggdb main.o file1.o file2.o -o gdb-main
 
main.o : main.c file1.h file2.h
    gcc -c -ggdb main.c
 
file1.o:file1.c file1.h
    gcc -c -ggdb file1.c
 
file2.o:file2.c file2.h
    gcc -c -ggdb file2.c

Your compiled target should have the same name as your make rule.
Compiling a .c file to a .o file needs the -c flag.

fixed to :
main : main.o file1.o file2.o
gcc -ggdb -c main.o file1.o file2.o -o gdb-main

main.o : main.c file1.h file2.h
gcc -ggdb -c main.c

file1.o:file1.c file1.h
gcc -ggdb -c file1.c

file2.o:file2.c file2.h
gcc -ggdb -c file2.c


PHONY : clean

clean :
rm *.o

the error:

$make ./main
gcc -ggdb -c main.c
gcc -ggdb -c file1.c
gcc -ggdb -c file2.c
gcc -ggdb -c main.o file1.o file2.o -o gdb-main
gcc: warning: main.o: linker input file unused because linking not done
gcc: warning: file1.o: linker input file unused because linking not done
gcc: warning: file2.o: linker input file unused because linking not done
$
$

Take a close look at Salem's post. You only need the -c flag when compiling a .c file into a .o file (the compilation proper phase). You don't need it when combining your .o files into the final executable (the linking phase).

Code:

main : main.o file1.o file2.o
gcc -ggdb -c main.o file1.o file2.o -o gdb-main

Remove the -c parameter from that one line only.