Shared lib symlinks in target image

Shared lib symlinks in target image

[Lijun Chen]

[-- Attachment #1: Type: text/plain, Size: 1293 bytes --]

Hi,


When I build a yocto image, I added some packages into IMAGE_INSTALL, such as boost, thrift, etc. I notice in the target OS image, the shared libs don't the symlinks. But in the SDK image, the symlinks are there. For example,

lrwxrwxrwx 1 root root       22 Oct  2 16:41 libboost_filesystem-mt.so -> libboost_filesystem.so
lrwxrwxrwx 1 root root       29 Oct  2 16:41 libboost_filesystem.so -> libboost_filesystem.so.1.75.0

Is there a way to add the symlinks to the target image as well?


With the symlinks, I assume we can run an old application even the dependent lib is a newer version?


Thanks,

Lijun

----------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

[-- Attachment #2: Type: text/html, Size: 1800 bytes --]

Re: [yocto] Shared lib symlinks in target image

[Khem Raj]

On Sat, Oct 2, 2021 at 6:55 PM Lijun Chen <lijchen@blackberry.com> wrote:
>
> Hi,
>
>
> When I build a yocto image, I added some packages into IMAGE_INSTALL, such as boost, thrift, etc. I notice in the target OS image, the shared libs don't the symlinks. But in the SDK image, the symlinks are there. For example,
>
> lrwxrwxrwx 1 root root       22 Oct  2 16:41 libboost_filesystem-mt.so -> libboost_filesystem.so
> lrwxrwxrwx 1 root root       29 Oct  2 16:41 libboost_filesystem.so -> libboost_filesystem.so.1.75.0
>
> Is there a way to add the symlinks to the target image as well?
>
>
> With the symlinks, I assume we can run an old application even the dependent lib is a newer version?
>

unversioned symlinks should not be used they are there to be used for
linking during build time. Unless you need to do builds on targets you
really do not need them
so explain you usecase. Are you trying to build stuff on device ?

>
> Thanks,
>
> Lijun
>
> ________________________________
> This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> You automatically follow any topics you start or reply to.
> View/Reply Online (#54934): https://lists.yoctoproject.org/g/yocto/message/54934
> Mute This Topic: https://lists.yoctoproject.org/mt/86035483/1997914
> Group Owner: yocto+owner@lists.yoctoproject.org
> Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [raj.khem@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>

Re: [yocto] Shared lib symlinks in target image

[Lijun Chen]

[-- Attachment #1: Type: text/plain, Size: 3581 bytes --]

I have an app built in a different environment that has lower versioned libs, such as boost. I was wondering if on the target there are symlinks to those libs, whether the app can be run on a target that has newer libs without resbuild against a matched env. Seems that is not viable.

________________________________
From: Khem Raj <raj.khem@gmail.com>
Sent: Saturday, October 2, 2021 11:23:58 PM
To: Lijun Chen
Cc: yocto@lists.yoctoproject.org
Subject: Re: [yocto] Shared lib symlinks in target image

On Sat, Oct 2, 2021 at 6:55 PM Lijun Chen <lijchen@blackberry.com> wrote:
>
> Hi,
>
>
> When I build a yocto image, I added some packages into IMAGE_INSTALL, such as boost, thrift, etc. I notice in the target OS image, the shared libs don't the symlinks. But in the SDK image, the symlinks are there. For example,
>
> lrwxrwxrwx 1 root root       22 Oct  2 16:41 libboost_filesystem-mt.so -> libboost_filesystem.so
> lrwxrwxrwx 1 root root       29 Oct  2 16:41 libboost_filesystem.so -> libboost_filesystem.so.1.75.0
>
> Is there a way to add the symlinks to the target image as well?
>
>
> With the symlinks, I assume we can run an old application even the dependent lib is a newer version?
>

unversioned symlinks should not be used they are there to be used for
linking during build time. Unless you need to do builds on targets you
really do not need them
so explain you usecase. Are you trying to build stuff on device ?

>
> Thanks,
>
> Lijun
>
> ________________________________
> This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> You automatically follow any topics you start or reply to.
> View/Reply Online (#54934): https://urldefense.com/v3/__https://lists.yoctoproject.org/g/yocto/message/54934__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJORDalv1bA$
> Mute This Topic: https://urldefense.com/v3/__https://lists.yoctoproject.org/mt/86035483/1997914__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJOTJ_1cQxQ$
> Group Owner: yocto+owner@lists.yoctoproject.org
> Unsubscribe: https://urldefense.com/v3/__https://lists.yoctoproject.org/g/yocto/unsub__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJOQieFL_-A$  [raj.khem@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>

----------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

[-- Attachment #2: Type: text/html, Size: 5344 bytes --]

Re: [yocto] Shared lib symlinks in target image

[Khem Raj]

[-- Attachment #1: Type: text/plain, Size: 3845 bytes --]

Libraries have another symlink which looks something like libfoo.so.1 and 2
etc that is the one which should be used by apps
On Mon, Oct 4, 2021 at 6:12 AM Lijun Chen <lijchen@blackberry.com> wrote:

> I have an app built in a different environment that has lower versioned
> libs, such as boost. I was wondering if on the target there are symlinks to
> those libs, whether the app can be run on a target that has newer libs
> without resbuild against a matched env. Seems that is not viable.
> ------------------------------
> *From:* Khem Raj <raj.khem@gmail.com>
> *Sent:* Saturday, October 2, 2021 11:23:58 PM
> *To:* Lijun Chen
> *Cc:* yocto@lists.yoctoproject.org
> *Subject:* Re: [yocto] Shared lib symlinks in target image
>
> On Sat, Oct 2, 2021 at 6:55 PM Lijun Chen <lijchen@blackberry.com> wrote:
> >
> > Hi,
> >
> >
> > When I build a yocto image, I added some packages into IMAGE_INSTALL,
> such as boost, thrift, etc. I notice in the target OS image, the shared
> libs don't the symlinks. But in the SDK image, the symlinks are there. For
> example,
> >
> > lrwxrwxrwx 1 root root       22 Oct  2 16:41 libboost_filesystem-mt.so
> -> libboost_filesystem.so
> > lrwxrwxrwx 1 root root       29 Oct  2 16:41 libboost_filesystem.so ->
> libboost_filesystem.so.1.75.0
> >
> > Is there a way to add the symlinks to the target image as well?
> >
> >
> > With the symlinks, I assume we can run an old application even the
> dependent lib is a newer version?
> >
>
> unversioned symlinks should not be used they are there to be used for
> linking during build time. Unless you need to do builds on targets you
> really do not need them
> so explain you usecase. Are you trying to build stuff on device ?
>
> >
> > Thanks,
> >
> > Lijun
> >
> > ________________________________
> > This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute non-public
> information. Any use of this information by anyone other than the intended
> recipient is prohibited. If you have received this transmission in error,
> please immediately reply to the sender and delete this information from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be unlawful.
> >
> > -=-=-=-=-=-=-=-=-=-=-=-
> > Links: You receive all messages sent to this group.
> > You automatically follow any topics you start or reply to.
> > View/Reply Online (#54934):
> https://urldefense.com/v3/__https://lists.yoctoproject.org/g/yocto/message/54934__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJORDalv1bA$
> > Mute This Topic:
> https://urldefense.com/v3/__https://lists.yoctoproject.org/mt/86035483/1997914__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJOTJ_1cQxQ$
> > Group Owner: yocto+owner@lists.yoctoproject.org
> > Unsubscribe:
> https://urldefense.com/v3/__https://lists.yoctoproject.org/g/yocto/unsub__;!!COg3wY07Hnb7!44p3yfVEnAD6rM-DM0muASh2wNizlchKqgoweZDAV8wx1sd8uvxVqOEHJOQieFL_-A$
> [raj.khem@gmail.com]
> > -=-=-=-=-=-=-=-=-=-=-=-
> >
> ------------------------------
> This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute non-public
> information. Any use of this information by anyone other than the intended
> recipient is prohibited. If you have received this transmission in error,
> please immediately reply to the sender and delete this information from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be unlawful.
>

[-- Attachment #2: Type: text/html, Size: 6156 bytes --]