Re: [Qemu-devel] qemu sources and makefile system

[Stefan Hajnoczi]

On Tue, Jan 06, 2015 at 11:44:34AM +0200, Catalin Vasile wrote:
> I'm new to qemu-devel and I'm trying to add a ".c" source to qemu.
> To be more specific, I'm trying to add a file into <qemu src>/hw/virtio/.
> I've added "common-obj-y += virtio-src.o" to the Makefile.objs in that
> folder
> and when I'm compiling qemu it seems to compile the sources, but I don't
> know
> if they are added to the qemu binary.
> Is there anything else left to do in order for qemu build system to include
> my source file?

You could look at the link map to see which object files are included by the 
linker:

1. Run make V=1 to see the final gcc command-line.
2. Copy the command-line and append -Xlinker -Map=output.map
3. Now look at the output.map file

Or look at the symbol table in the binary:

$ readelf -s x86_64-softmmu/qemu-system-x86_64 | grep virtio-
   740: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-blk.c
   791: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-blk.c
   799: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-serial-bus.c
  1158: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-net.c
  1262: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-scsi.c
  1329: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS 
virtio-scsi-dataplane.c
  1554: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-balloon.c
  4884: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-console.c
  9308: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-rng.c
  9333: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-pci.c
  9453: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-bus.c
  9476: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS virtio-mmio.c

If you need help, please post a git URL so we can see your code.

Stefan

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