Thread: Makefile problem

Hello,

I have followed a tutorial for creating a simple gtk+2 application using MinGW. The c source file looks alright, but the Makefile seems to contain an error:

Code:

CC=gcc
CFLAGS=`pkg-config --cflags --libs gtk+-2.0`
CFLAGS+=-mwindows
SRC=hello.c
OBJ=$(SRC:.c=.o)
OUT=hello.exe

all: $(OUT)
	rm $(OBJ) #Remove .o

$(OBJ) :
	$(CC) $(SRC) $(CFLAGS) -c #Create .o

$(OUT) : $(OBJ)
	$(CC) $(OBJ) $(CFLAGS) -o $@ #Link .o

First, I wonder why it says CC=gcc when I'm using mingw. But that's not the problem. My compiler complains and says "`pkg-config: No such file or directory". I read somewhere that the backquotes used in that line is a unix/linux thing that the windows shell doesn't understand. What should I use instead?

Thanks for the reply. I read the post, but there's a couple of things that's unclear to me:

First, what is a .ps file? Why do I have to set a path, and how do I do it? Do those things live? :S

"You can do this every time you start a MSYS session"... But I don't run MSYS, I run Emacs and compile via the compile command. Can I integrate the line
set PKG_CONFIG_PATH=/mingw/lib/pkgconfig into the Makefile somehow?

I want my application as portable as possible, hence I would rather write something into my makefile than change/add some system variable. Is it possible to do it only by changing in the makefile? Btw, do you mean "System properties->Environment variables->System variables"? I didn't find any PKG_CONFIG_PATH, but maybe I was looking at the wrong place.

Originally Posted by TriKri

I want my application as portable as possible, hence I would rather write something into my makefile than change/add some system variable. Is it possible to do it only by changing in the makefile? Btw, do you mean "System properties->Environment variables->System variables"? I didn't find any PKG_CONFIG_PATH, but maybe I was looking at the wrong place.

Nah, you ADD a new path called PKG_CONFIG_PATH (or whatever it is that you want to have before your compile command).

You can also do "set ... " in a command prompt window and start (x)emacs from there.

--
Mats

Now I have set a variable called PKG_CONFIG_PATH, but it still doesn't work. I have tried to set it to both /mingw/lib/pkgconfig and /program files/mingw/lib/pkgconfig and C:/program files/mingw/lib/pkgconfig, both with forwardslashes and with backslashes, since mingw is installed under C:\Program Files\MinGW, and all other system variables uses backslashes.

So, this is what it says:

Code:

-*- mode: compilation; default-directory: "d:/Work/cpp/GTK+ setup/" -*-
Compilation started at Thu Jun 26 00:09:43

mingw32-make -k 
gcc hello.c `pkg-config --cflags --libs gtk+-2.0` -mwindows -c #Create .o
cc1.exe: error: unrecognized command line option "-fcflags"
cc1.exe: error: unrecognized command line option "-flibs"
gcc: `pkg-config: No such file or directory
gcc: gtk+-2.0`: No such file or directory
gcc: #Create: No such file or directory
gcc: .o: No such file or directory
mingw32-make: *** [hello.o] Error 1
mingw32-make: Target `all' not remade because of errors.

Compilation exited abnormally with code 2 at Thu Jun 26 00:09:43

Your makefile assumes that the shell you use translates commands between the `` is translated into arguments to gcc, which appears to not be the case.

A quick hack would be to run

Code:

pkg-config --cflags --libs gtk+-2.0

and then set the gcc flags to the ouptut of that comand instead.

--
Mats

Do you mean like this:

Code:

CC=gcc
CFLAGS=$(PKG_CONFIG) #This code have been moved down there
CFLAGS+=-mwindows
SRC=hello.c
OBJ=$(SRC:.c=.o)
OUT=hello.exe

all: $(OUT)
	rm $(OBJ) #Remove .o

$(OBJ) :
	$(CC) $(SRC) $(CFLAGS) -c #Create .o

$(OUT) : $(OBJ)
	$(CC) $(OBJ) $(CFLAGS) -o $@ #Link .o

$(PKG_CONFIG) : `pkg-config --cflags --libs gtk+-2.0` #This line is new

I suck at creating makefiles, but I would guess that's a variable I have crearted. Now it doesn't complain about the same things at least, but it says "gdk/gdk.h: No such file or directory", so I guess the pkg-config didn't work...