Re: [Qemu-devel] Questions about gcc linker errors in crypto sub-directory

["Gonglei (Arei)" <arei.gonglei@huawei.com>]

> -----Original Message-----
> From: Daniel P. Berrange [mailto:berrange@redhat.com]
> Sent: Monday, September 26, 2016 5:14 PM
> To: Gonglei (Arei)
> Cc: qemu-devel@nongnu.org
> Subject: Re: Questions about gcc linker errors in crypto sub-directory
> 
> On Mon, Sep 26, 2016 at 09:03:45AM +0000, Gonglei (Arei) wrote:
> > Hi Daniel,
> >
> > I'm coding cryptodev-vhost-user.c as a new cryptodev backend,
> > but the gcc report some linker errors:
> >
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_crypto_cleanup':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:87:
> undefined reference to `vhost_dev_cleanup'
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_crypto_init':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:126:
> undefined reference to `vhost_dev_init'
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_user_opened':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:187:
> undefined reference to `qemu_chr_find'
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:194:
> undefined reference to `qemu_chr_fe_claim_no_fail'
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_user_event':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:213:
> undefined reference to `qemu_chr_set_reconnect_time'
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_user_init':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:257:
> undefined reference to `qemu_chr_add_handlers'
> > crypto/cryptodev-vhost-user.o: In function
> `qcrypto_cryptodev_vhost_user_finalize':
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:353:
> undefined reference to `qemu_chr_add_handlers'
> > /mnt/sdb/gonglei/qemu.git/qemu/crypto/cryptodev-vhost-user.c:354:
> undefined reference to `qemu_chr_fe_release'
> > collect2: ld returned 1 exit status
> > make: *** [qemu-nbd] Error 1
> >
> > Currently I only change the crypto/Makefile.objs:
> >
> > diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs
> > index b9ad26a..575f64e 100644
> > --- a/crypto/Makefile.objs
> > +++ b/crypto/Makefile.objs
> > @@ -28,6 +28,7 @@ crypto-obj-y += block-qcow.o
> >  crypto-obj-y += block-luks.o
> >  crypto-obj-y += cryptodev.o
> >  crypto-obj-y += cryptodev-builtin.o
> > +crypto-obj-y += cryptodev-vhost-user.o
> 
> The $(crypto-obj-y) variable is intended to only contain general purpose
> crypto code, since it needs to be linked to all QEMU programs. Your
> cryptodev file is specific to system emulators, so must only be linked
> to the system emulator targets. Thus, it should not be added to the
> crypto-obj-y variable.
> 
> It probably needs to be added to either common-obj-y or obj-y - I can't
> remember which is "best"
> 
common-obj-y is fine! So all cryptodev stuff should be use 
$( crypto-obj-y) variable, right? I'll change them in the next version. 

Thank you so much!

Regards,
-Gonglei

> Regards,
> Daniel
> --
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