Question

SO.

I’m a little new to the Linux dev world (without an ide), so please be patient.

The Issue

I have a make file constructed which compiles about 7-8 files into .o files which are then linked together with a few libraries. I have done locates on these libraries, and their dev counterparts do exist. The problem is that the linker refuses to find them. My output (if I am reading this correctly) tells me that it’s looking in the wrong area. I’ve exported my LD_PATH to include /usr/lib, which is where my .so. files are. My main question is, how do I get -lglew and -lglut to link up with each other? I would also like to put my .o files in my obj folder and my binaries in a bin folder. Is this possible in a makefile? If so, given my make file, what would be the best recipe to do this?

The Makefile

  1 BIN = bin/
  2 OBJ = obj/
  3 TARGET = opengl_03
  4 DEPS = main.o  displayinit.o initializer.o algorithms.o matrix3f.o window.o vertex3.o
  5 CC = g++
  6 CFLAGS = -g -m32
  7 LIBS = -lglut -lGLEW
  8 INCLUDEPATH = -L/usr/include/ -L/usr/lib
  9 
 10 $(TARGET) : $(DEPS)
 11     $(CC) $(LIBS) $(INCLUDEPATH) $(CFLAGS) -o $(TARGET)  $(DEPS) $(BIN)
 12 
 13 displayinit.o : displayinit.cpp displayinit.h
 14     $(CC) -c displayinit.cpp $(OBJ)
 15 initializer.o : initializer.cpp initializer.h
 16     $(CC) -c initializer.cpp $(OBJ)
 17 algorithms.o : algorithms.cpp algorithms.h
 18     $(CC) -c algorithms.cpp $(OBJ)
 19 matrix3f.o : matrix3f.cpp matrix3f.h
 20     $(CC) -c matrix3f.cpp $(OBJ)
 21 vertex3.o : vertex3.cpp vertex3.h
 22     $(CC) -c vertex3.cpp $(OBJ)
 23 window.o : window.cpp window.h
 24     $(CC) -c window.cpp $(OBJ)
 25 main.o : main.cpp
 26     $(CC) -c main.cpp $(OBJ)
 27 
 28 clean:
 29     rm $(DEPS) 
 30 
 31 

Output

g++ -lglut -lGLEW  -L/usr/include/ -L/usr/lib -g -m32  -o opengl_03  main.o  displayinit.o initializer.o algorithms.o matrix3f.o window.o vertex3.o bin/
/usr/bin/ld: skipping incompatible /usr/lib/libglut.so when searching for -lglut
/usr/bin/ld: skipping incompatible /usr/lib/libglut.a when searching for -lglut
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../libglut.so when searching for -lglut
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../libglut.a when searching for -lglut
/usr/bin/ld: skipping incompatible /usr/lib/libglut.so when searching for -lglut
/usr/bin/ld: skipping incompatible /usr/lib/libglut.a when searching for -lglut
/usr/bin/ld: cannot find -lglut
/usr/bin/ld: cannot find -lGLEW
/usr/bin/ld: cannot find bin/: File format not recognized
collect2: ld returned 1 exit status
make: *** [opengl_03] Error 1

I appreciate the assistance.

Answer 1

Which Linux are you using? It looks like you’re using a 64-bit system, but trying to compile a 32-bit application (because of -m32 compiler switch). So either remove the -m32 or install the 32-bit development libraries. They may be named like freeglut-32bit or something like that.