Question

I have compiled a makefile project under linux, just yesterday. Now the project won’t compile and I can’t remember making any change whatsoever to the makefile itself. It throws a make: *** No rule to make target 'obj/TranquilMain.o', needed by 'tranquil;. Stop. error at make. The only real change I’ve made, is when I copied the code and makefile over from another project, I changed the name of certain files (and dependencies includes) and then altered the _DEPS in the makefile. All files in necessary locations.

It should be noted that it compiles fine, if I remove all other files than TranquilMain.o from the _OBJ list. enter code hereI wish I could provide more than just code, and this knowledge, but I haven’t a clue what the problem is.

Appropriate Makefile: “makefile”

#!/usr/bin/make

CC      = gcc
CP      = g++

SRC_DIR     = #.
OBJ_DIR     = obj
INC_DIR     = ../include
LIB_DIR     = ../lib

LIBS        = -lm -lSDL -lSDLmain -lSDL_image -lSDL_mixer -lSDL_ttf -lSDL_net -lGL -lGLU -lGLEW
CFLAGS      = -I$(INC_DIR) -L$(LIB_DIR) -std=gnu++0x


_DEPS   = DefaultConfig.h BaseApplication.h BasePlugin.h SDLImage.h SDLFont.h SDLWindow.h SDLInput.h SDLRenderer.h SDLApplication.h Math2D.h SDLTimer.h
DEPS    = $(patsubst %,$(INC_DIR)/%,$(_DEPS))

_OBJ    = TranquilMain.o BaseApplication.o BasePlugin.o SDLImage.o SDLFont.o SDLWindow.o SDLInput.o SDLRenderer.o SDLApplication.o Math2D.o SDLTimer.o
OBJ = $(patsubst %,$(OBJ_DIR)/%,$(_OBJ))


$(OBJ_DIR)/%.o: %.cpp $(DEPS)
    $(CP) -c -o $@ $< $(CFLAGS)

tranquil: $(OBJ)
    $(CP) -o ../bin/$@ $^ $(CFLAGS) $(LIBS)

.PHONY: clean
clean:
    rm -f $(OBJ_DIR)/*.o *~ core $(INC_DIR)/*~

Clearly useless TranquilMain.cpp (just the first file in the dependencies)

#include <iostream>
#include <fstream>
#include <string>


int main( int argc, char* args[] )
{
    bool running = true;

    while( running == true )
    {
    }

    return 0;
}

Answer 1

Also, make sure you haven’t inadvertantly turned tabs into whitespace.

A rule MUST begin with a “tab”:

#BAD!
tranquil: $(OBJ)
<space><space>$(CP) -o ../bin/$@ $^ $(CFLAGS) $(LIBS)

#GOOD!
tranquil: $(OBJ)
<tab>$(CP) -o ../bin/$@ $^ $(CFLAGS) $(LIBS)