Re: [Qemu-devel] [PATCH v3 20/29] Include qemu/main-loop.h less

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 8/9/19 11:42 AM, Philippe Mathieu-Daudé wrote:
[...]
> netmap failing again :S
> 
> $ make docker-image-debian-amd64 V=1 DEBUG=1
> [...]
>   CC      net/netmap.o
> net/netmap.c: In function 'netmap_update_fd_handler':
> net/netmap.c:109:5: error: implicit declaration of function
> 'qemu_set_fd_handler' [-Werror=implicit-function-declaration]
>      qemu_set_fd_handler(s->nmd->fd,
>      ^~~~~~~~~~~~~~~~~~~
> net/netmap.c:109:5: error: nested extern declaration of
> 'qemu_set_fd_handler' [-Werror=nested-externs]

Since it might not be obvious to see how helpful/powerful is Docker, I
gathered few notes (already posted once) about how I use it (often
bisecting).

# Automatically create a base image (the image is then cached)
$ make docker-image-debian-s390x-cross

# Create a out-of-tree build directory
$ mkdir build/docker_s390x

# Run ./configure
#
# --rm  : Use a temp copy of the base image (do not modify it)
# -v ...: Mount the current directory within the container
# -w ...: Start the shell in the out-of-tree directory
# -u ...: Use same UID as my user so I can remove the files after
# $QEMU_CONFIGURE_OPTS contains the cross-compile options
#
$ docker run --rm \
  -v $PWD:$PWD \
  -w $PWD/build/docker_s390x \
  -u $UID \
  qemu:debian-s390x-cross \
    \
    sh -c "../../configure \$QEMU_CONFIGURE_OPTS"

I use 'sh -c' to escape $QEMU_CONFIGURE_OPTS, there might be a cleaner
way to do this.

# Stupid step to speed up bisection
# This will:
# - clone submodules if necessary
# - build slirp
# - build fdt
# - build capstone
# - generated bunch of headers
# - generated bunch of trace files
$ docker run --rm \
  -v $PWD:$PWD \
  -w $PWD/build/docker_s390x \
  -u $UID \
  qemu:debian-s390x-cross \
    \
    make stubs/qtest.o

Now the directory is ready for building/bisecting.

I.e. build a single file:

$ docker run --rm \
  -v $PWD:$PWD \
  -w $PWD/build/docker_s390x \
  -u $UID \
  qemu:debian-s390x-cross \
    \
    make -C s390x-softmmu hw/intc/s390_flic_kvm.o

make: Entering directory 'build/docker_s390x/s390x-softmmu'
  CC      hw/intc/s390_flic_kvm.o
hw/intc/s390_flic_kvm.c: In function 'kvm_flic_save':
hw/intc/s390_flic_kvm.c:395:9: error: implicit declaration of function
'qemu_put_be64' [-Werror=implicit-function-declaration]
         qemu_put_be64(f, FLIC_FAILED);
         ^~~~~~~~~~~~~
hw/intc/s390_flic_kvm.c:395:9: error: nested extern declaration of
'qemu_put_be64' [-Werror=nested-externs]
hw/intc/s390_flic_kvm.c:410:9: error: implicit declaration of function
'qemu_put_buffer' [-Werror=implicit-function-declaration]
         qemu_put_buffer(f, (uint8_t *) buf,
         ^~~~~~~~~~~~~~~
hw/intc/s390_flic_kvm.c:410:9: error: nested extern declaration of
'qemu_put_buffer' [-Werror=nested-externs]
hw/intc/s390_flic_kvm.c: In function 'kvm_flic_load':
hw/intc/s390_flic_kvm.c:438:13: error: implicit declaration of function
'qemu_get_be64' [-Werror=implicit-function-declaration]
     count = qemu_get_be64(f);
             ^~~~~~~~~~~~~
hw/intc/s390_flic_kvm.c:438:5: error: nested extern declaration of
'qemu_get_be64' [-Werror=nested-externs]
     count = qemu_get_be64(f);
     ^~~~~
hw/intc/s390_flic_kvm.c:454:9: error: implicit declaration of function
'qemu_get_buffer' [-Werror=implicit-function-declaration]
     if (qemu_get_buffer(f, (uint8_t *) buf, len) != len) {
         ^~~~~~~~~~~~~~~
hw/intc/s390_flic_kvm.c:454:5: error: nested extern declaration of
'qemu_get_buffer' [-Werror=nested-externs]
     if (qemu_get_buffer(f, (uint8_t *) buf, len) != len) {
     ^~
cc1: all warnings being treated as errors
rules.mak:69: recipe for target 'hw/intc/s390_flic_kvm.o' failed
make: *** [hw/intc/s390_flic_kvm.o] Error 1
make: Leaving directory 'build/docker_s390x/s390x-softmmu'

Hope that help!

Regards,

Phil.