Re: [PATCH-for-5.2 v4 01/17] configure: Check vhost-user is available to build vhost-user-blk-server

[Thomas Huth <thuth@redhat.com>]

On 08/11/2020 21.45, Philippe Mathieu-Daudé wrote:
> Check vhost-user is available to build vhost-user-blk-server to fix:
> 
>  $ ../configure \
>       --disable-vhost-user --enable-vhost-user-blk-server && \
>    make qemu-nbd
>  ...
>  [505/505] Linking target qemu-nbd
>  FAILED: qemu-nbd
>  cc  -o qemu-nbd qemu-nbd.p/qemu-nbd.c.o -Wl,--as-needed -Wl,--no-undefined -pie -Wl,--whole-archive libblockdev.fa libblock.fa libcrypto.fa libauthz.fa libqom.fa libio.fa -Wl,--no-whole-archive -Wl,--warn-common -Wl,-z,relro -Wl,-z,now -m64 -fstack-protector-strong -Wl,--start-group libqemuutil.a libblockdev.fa libblock.fa libcrypto.fa libauthz.fa libqom.fa libio.fa @block.syms -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0 -pthread -lgnutls -lutil -lm -lgthread-2.0 -lglib-2.0 -lbz2 -lgthread-2.0 -lglib-2.0 -lssh -lrbd -lrados -lcurl -lxml2 -lzstd -lacl -lgfapi -lglusterfs -lgfrpc -lgfxdr -luuid -laio /usr/lib64/libz.so -L/usr/lib64/iscsi -liscsi -lnettle -lgnutls -lpam -Wl,--end-group
>  /usr/bin/ld: libblockdev.fa(block_export_vhost-user-blk-server.c.o): in function `vu_blk_process_vq':
>  block/export/vhost-user-blk-server.c:203: undefined reference to `vu_get_queue'
>  /usr/bin/ld: block/export/vhost-user-blk-server.c:208: undefined reference to `vu_queue_pop'
>  /usr/bin/ld: libblockdev.fa(block_export_vhost-user-blk-server.c.o): in function `vu_blk_queue_set_started':
>  block/export/vhost-user-blk-server.c:228: undefined reference to `vu_get_queue'
>  /usr/bin/ld: libblockdev.fa(block_export_vhost-user-blk-server.c.o): in function `vu_blk_req_complete':
>  block/export/vhost-user-blk-server.c:55: undefined reference to `vu_queue_push'
>  /usr/bin/ld: block/export/vhost-user-blk-server.c:56: undefined reference to `vu_queue_notify'
>  /usr/bin/ld: libblockdev.fa(block_export_vhost-user-blk-server.c.o): in function `vu_blk_queue_set_started':
>  block/export/vhost-user-blk-server.c:229: undefined reference to `vu_set_queue_handler'
>  /usr/bin/ld: libqemuutil.a(util_vhost-user-server.c.o): in function `vu_client_trip':
>  util/vhost-user-server.c:176: undefined reference to `vu_dispatch'
>  /usr/bin/ld: util/vhost-user-server.c:180: undefined reference to `vu_deinit'
>  /usr/bin/ld: libqemuutil.a(util_vhost-user-server.c.o): in function `vu_accept':
>  util/vhost-user-server.c:291: undefined reference to `vu_init'
>  collect2: error: ld returned 1 exit status
>  ninja: build stopped: subcommand failed.
>  make: *** [Makefile:171: run-ninja] Error 1
> 
> Fixes: bc15e44cb21 ("configure: introduce --enable-vhost-user-blk-server")
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  configure | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/configure b/configure
> index 805f7791503..5079ebb416a 100755
> --- a/configure
> +++ b/configure
> @@ -2390,6 +2390,9 @@ fi
>  
>  # libvhost-user is Linux-only
>  test "$vhost_user_blk_server" = "" && vhost_user_blk_server=$linux
> +if test "$vhost_user_blk_server" = "yes" && test "$vhost_user" = "no"; then
> +  error_exit "--enable-vhost-user-blk-server requires --enable-vhost-user"
> +fi

This patch looks incomplete to me. If I now do:

$ .../configure --target-list=x86_64-softmmu --disable-vhost-user

I get:

ERROR: --enable-vhost-user-blk-server requires --enable-vhost-user

... but I did not say --enable-vhost-user-blk-server ! So if
--disable-vhost-user has been given, it should also automatically disable
all the other vhost-user switches, I think.

 Thomas