Re: [libvirt] PATCH: 25/25: Support ac97 sound card

On Fri, Jan 16, 2009 at 04:59:13PM +0100, Daniel Veillard wrote: CIL can do this easily. However, over the weekend I was looking at the new -fwhole-program and -combine options to gcc. They are intended to do whole-program optimization, but because of the way they work they can also remove unused functions from the output: $ cat test1.c #include <stdio.h> void unused (void) { printf ("I'm not used.\n"); } $ cat test2.c #include <stdio.h> #include <stdlib.h> int main (int argc, char *argv[]) { printf ("hello, world\n"); exit (0); } $ gcc -Wall -c test1.c -o test1.o $ gcc -Wall -c test2.c -o test2.o $ gcc -Wall test1.o test2.o -o test $ nm test | grep unused 000000000040050c T unused $ gcc -Wall -combine -fwhole-program test1.c test2.c -o test $ nm test | grep unused One problem is that the rest of the toolchain (ie. libtool) doesn't understand them yet :-( Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/