Linux makefile / glade2 / libtag / gcc linking problem.

scojones

Hey there. I've used glade2 to create a gtk GUI, this in turn generated a whole load of source files, makefiles and the like. If you're familiar with glade or glade2 you'll know what I'm on about.

Anyway, I'm adding to main.c (one of the generated source files). I'm including the taglib c bindings header file (#include <tag_c.h>), and attempting to call the functions contained therein, in main.c. If I create a seperate source file, not for use in this package, lets say test2.c, it is compiled and linked as follows:

gcc -Wall  -I/usr/include/taglib -c test2.c
gcc -o test2 test2.o /usr/lib/libtag_c.so

So, what I want to do is get the Makefile to use -I/usr/include/taglib for main.c, and when linking to link against /usr/lib/libtag_c.so as shown above.

I've edited the Makefile found in <packagename>/src and in <packagename> like so:

PACKAGE_CFLAGS = <all of the generated gtk crap here> -I/usr/include/taglib

and

PACKAGE_LIBS = <all of the generated gtk crap here> -ltag_c

But it doesn't seem to be compiling with those flags, as you can see from here:

gcc -DHAVE_CONFIG_H -I. -I. -I.. 
-DPACKAGE_DATA_DIR=\""/usr/local/share"\"     -DPACKAGE_LOCALE_DIR=\""/usr/local/share/locale"\"       
-I/usr/include/gtk-2.0 
-I/usr/lib/gtk-2.0/include 
-I/usr/include/atk-1.0 
-I/usr/include/cairo 
-I/usr/include/pango-1.0 
-I/usr/include/glib-2.0 
-I/usr/lib/glib-2.0/include      
-g -O2 -c main.c
main.c:21:19: error: tag_c.h: No such file or directory
main.c: In function 'scan_directory':
main.c:62: error: 'TagLib_File' undeclared (first use in this function)
main.c:62: error: (Each undeclared identifier is reported only once
main.c:62: error: for each function it appears in.)
main.c:62: error: 'file' undeclared (first use in this function)
main.c:63: error: 'TagLib_Tag' undeclared (first use in this function)
main.c:63: error: 'tag' undeclared (first use in this function)
main.c:64: error: syntax error before '*' token
main.c:73: warning: 'return' with a value, in function returning void
main.c:82: error: 'properties' undeclared (first use in this function)
main.c: In function 'file_select':
main.c:93: warning: conflicting types for built-in function 'rindex'
make[2]: *** [main.o] Error 1
make[2]: Leaving directory `/home/sj/Projects/zenjb/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/sj/Projects/zenjb'
make: *** [all-recursive-am] Error 2

As you can see gcc is not using the libs I want to it to. I'm sure there is a simple solution and realise this is a pure newbie question, so please don't flame me. In conjunction with this post I am currently googling my heart out, but I'm on 56k and it's taking me ages, hence the post.

Thanks for your time!

scojones

Here's the contents of the Makefile from the mainpackage dir:
http://www.rafb.net/paste/results/bzbkhd26.html

and here's the contents of the makefile from the 'src' dir, where main.c is located.
http://www.rafb.net/paste/results/GbC9HF71.html

Sorry about having to use the paste-bin, but boards told me the contents of each makefile was too big to post on here.

robfitz

You could try adding PACKAGE_CFLAGS to COMPILE, and PACKAGE_LIBS to LIBS or LINK (link order might be an issue). Something like:

COMPILE += PACKAGE_CFLAGS
LIBS += PACKAGE_LIBS

scojones

Cheers rob, in the end I changed CFLAGS = -g -O2 to CFLAGS = -g -O2 -I/usr/include/taglib and I added LIBS = -ltag_c which seems to have worked perfectly, mind you it compiles every source file with those options, but that's fine for me for now.

robfitz

Using Target-specific Variable Values might also be an option.

Something like this can be used to add to flags or add extra flags:

main.o : CFLAGS+=-I/usr/include/taglib

scojones

robfitz wrote:

Using Target-specific Variable Values might also be an option.

Something like this can be used to add to flags or add extra flags:

main.o : CFLAGS+=-I/usr/include/taglib

That worked like a charm rob, way better than my quick-hack solution. Thanks a million