Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-03 Thread Burt Silverman
Also, for the sake of completeness, it might be a good idea to spell out
the tool chain being used, Siddarth.

Burt

On Fri, Jan 3, 2020 at 7:58 AM Dave Barach via Lists.Fd.Io  wrote:

> There should be no need to change anything except what your plugin links
> against.
>
>
>
> As Damjan wrote: unless you’re more specific – name the symbols involved,
> where they’re defined, etc. - we can’t help you.
>
>
>
> Dave
>
>
>
> *From:* vpp-dev@lists.fd.io  *On Behalf Of *siddarth
> rai
> *Sent:* Friday, January 3, 2020 2:14 AM
> *To:* Damjan Marion 
> *Cc:* vpp-dev 
> *Subject:* Re: [vpp-dev] Linking external libraries to VPP executable
>
>
>
> Hi,
>
>
>
> My plugin is linked to an external lib.
>
> When my plugin calls the init function of that external lib, it runs into
> some problems with symbols (presumably the external lib init function calls
> a dlopen to load some other files)
>
> It seems the problem comes from the fact that VPP calls a dlopen of
> plugins.
>
> A simple executable linking directly to the external library and calling
> the init function of the external lib does not give the same problem.
>
>
>
> I prototyped the whole scenario by making a stub executable (acting like
> VPP executable). Also made a stub shared object (like the plugin) which
> links to the external lib. Then I did a dlopen of this shared object from
> my stub executable (just like VPP) where the shared object code calls the
> init function of external lib. This reproduces the same problem as seen
> with VPP. I then linked my stub executable with the external library in
> addition and then everything worked fine.
>
>
>
> In fact, I went ahead and changed the src/vlib/CMakeLists.txt so that
> external lib links with vlib. This works fine for me.
>
>
>
> I just wanted to find out, if there is any generic infra available to link
> additional external libraries to say, vlib, without fiddling around with
> the build system of VPP.
>
>
>
> Regards,
>
> Siddarth
>
>
>
> On Thu, Jan 2, 2020 at 7:38 PM Damjan Marion  wrote:
>
>
>
> 99% of vpp code is not in vpp executable so i wander why do you want to do
> that? both some of vpp standard libraries (vnet, vlib, ..) and some of vpp
> plugins are linked against libs, so to be able to help you i need more
> details...
>
> --
>
> Damjan
>
>
>
> On 2 Jan 2020, at 14:20, siddarth rai  wrote:
>
> 
>
> Hi,
>
>
>
> I mean only 'vpp executable'
>
>
>
> Regards,
>
> Siddarth
>
>
>
> On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion  wrote:
>
>
> what do you mean by “vpp executable lib”? can you provide more details
> what exactly do you want to do?
>
> --
> Damjan
>
> > On 2 Jan 2020, at 12:27, siddarth rai  wrote:
> >
> > 
> > Hello,
> >
> > I am working on VPP 1908.
> > I want to link some external non-vpp libraries to my vpp executable lib.
> >
> > Would it work if I add the path of external lib to vlib/CMakeLists.txt
> file using 'LINK_LIBRARIES' ?
> >
> > Can anyone tell if this is the right way or if there is any other way ?
> >
> > Any help will be appreciated.
> >
> > Thank you,
> > Siddarth
> > -=-=-=-=-=-=-=-=-=-=-=-
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-03 Thread Dave Barach via Lists.Fd.Io
There should be no need to change anything except what your plugin links 
against.

As Damjan wrote: unless you’re more specific – name the symbols involved, where 
they’re defined, etc. - we can’t help you.

Dave

From: vpp-dev@lists.fd.io  On Behalf Of siddarth rai
Sent: Friday, January 3, 2020 2:14 AM
To: Damjan Marion 
Cc: vpp-dev 
Subject: Re: [vpp-dev] Linking external libraries to VPP executable

Hi,

My plugin is linked to an external lib.
When my plugin calls the init function of that external lib, it runs into some 
problems with symbols (presumably the external lib init function calls a dlopen 
to load some other files)
It seems the problem comes from the fact that VPP calls a dlopen of plugins.
A simple executable linking directly to the external library and calling the 
init function of the external lib does not give the same problem.

I prototyped the whole scenario by making a stub executable (acting like VPP 
executable). Also made a stub shared object (like the plugin) which links to 
the external lib. Then I did a dlopen of this shared object from my stub 
executable (just like VPP) where the shared object code calls the init function 
of external lib. This reproduces the same problem as seen with VPP. I then 
linked my stub executable with the external library in addition and then 
everything worked fine.

In fact, I went ahead and changed the src/vlib/CMakeLists.txt so that external 
lib links with vlib. This works fine for me.

I just wanted to find out, if there is any generic infra available to link 
additional external libraries to say, vlib, without fiddling around with the 
build system of VPP.

Regards,
Siddarth

On Thu, Jan 2, 2020 at 7:38 PM Damjan Marion 
mailto:dmar...@me.com>> wrote:

99% of vpp code is not in vpp executable so i wander why do you want to do 
that? both some of vpp standard libraries (vnet, vlib, ..) and some of vpp 
plugins are linked against libs, so to be able to help you i need more 
details...
--
Damjan


On 2 Jan 2020, at 14:20, siddarth rai 
mailto:sid...@gmail.com>> wrote:

Hi,

I mean only 'vpp executable'

Regards,
Siddarth

On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion 
mailto:dmar...@me.com>> wrote:

what do you mean by “vpp executable lib”? can you provide more details what 
exactly do you want to do?

--
Damjan

> On 2 Jan 2020, at 12:27, siddarth rai 
> mailto:sid...@gmail.com>> wrote:
>
> 
> Hello,
>
> I am working on VPP 1908.
> I want to link some external non-vpp libraries to my vpp executable lib.
>
> Would it work if I add the path of external lib to vlib/CMakeLists.txt file 
> using 'LINK_LIBRARIES' ?
>
> Can anyone tell if this is the right way or if there is any other way ?
>
> Any help will be appreciated.
>
> Thank you,
> Siddarth
> -=-=-=-=-=-=-=-=-=-=-=-
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-03 Thread Damjan Marion via Lists.Fd.Io


> On 3 Jan 2020, at 08:13, siddarth rai  wrote:
> 
> Hi,
>  
> My plugin is linked to an external lib.
> When my plugin calls the init function of that external lib, it runs into 
> some problems with symbols (presumably the external lib init function calls a 
> dlopen to load some other files)
> It seems the problem comes from the fact that VPP calls a dlopen of plugins.
> A simple executable linking directly to the external library and calling the 
> init function of the external lib does not give the same problem.
>  
> I prototyped the whole scenario by making a stub executable (acting like VPP 
> executable). Also made a stub shared object (like the plugin) which links to 
> the external lib. Then I did a dlopen of this shared object from my stub 
> executable (just like VPP) where the shared object code calls the init 
> function of external lib. This reproduces the same problem as seen with VPP. 
> I then linked my stub executable with the external library in addition and 
> then everything worked fine.
>  
> In fact, I went ahead and changed the src/vlib/CMakeLists.txt so that 
> external lib links with vlib. This works fine for me.
>  
> I just wanted to find out, if there is any generic infra available to link 
> additional external libraries to say, vlib, without fiddling around with the 
> build system of VPP. 
> 

Linking plugin against external library is right thing to do, I can understand 
that there may be some hiccups but they should be fixed instead of linking your 
library against vlib, as that doesn’t make sense at all..
Unfortunately again no enough details about you “problems with symbols” to be 
able to help you..,


> Regards,
> Siddarth   
> 
> On Thu, Jan 2, 2020 at 7:38 PM Damjan Marion  > wrote:
> 
> 99% of vpp code is not in vpp executable so i wander why do you want to do 
> that? both some of vpp standard libraries (vnet, vlib, ..) and some of vpp 
> plugins are linked against libs, so to be able to help you i need more 
> details...
> 
> -- 
> Damjan
> 
>> On 2 Jan 2020, at 14:20, siddarth rai > > wrote:
>> 
>> 
>> Hi,
>> 
>> I mean only 'vpp executable'
>> 
>> Regards,
>> Siddarth
>> 
>> On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion > > wrote:
>> 
>> what do you mean by “vpp executable lib”? can you provide more details what 
>> exactly do you want to do?
>> 
>> -- 
>> Damjan
>> 
>> > On 2 Jan 2020, at 12:27, siddarth rai > > > wrote:
>> > 
>> > 
>> > Hello,
>> > 
>> > I am working on VPP 1908.
>> > I want to link some external non-vpp libraries to my vpp executable lib.
>> > 
>> > Would it work if I add the path of external lib to vlib/CMakeLists.txt 
>> > file using 'LINK_LIBRARIES' ? 
>> > 
>> > Can anyone tell if this is the right way or if there is any other way ?
>> > 
>> > Any help will be appreciated.
>> > 
>> > Thank you,
>> > Siddarth
>> > -=-=-=-=-=-=-=-=-=-=-=-
>> > Links: You receive all messages sent to this group.
>> > 
>> > View/Reply Online (#15013): https://lists.fd.io/g/vpp-dev/message/15013 
>> > 
>> > Mute This Topic: https://lists.fd.io/mt/69378301/675642 
>> > 
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>> >   [dmar...@me.com 
>> > ]
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-02 Thread siddarth rai
Hi,



My plugin is linked to an external lib.

When my plugin calls the init function of that external lib, it runs into
some problems with symbols (presumably the external lib init function calls
a dlopen to load some other files)

It seems the problem comes from the fact that VPP calls a dlopen of plugins.

A simple executable linking directly to the external library and calling
the init function of the external lib does not give the same problem.



I prototyped the whole scenario by making a stub executable (acting like
VPP executable). Also made a stub shared object (like the plugin) which
links to the external lib. Then I did a dlopen of this shared object from
my stub executable (just like VPP) where the shared object code calls the
init function of external lib. This reproduces the same problem as seen
with VPP. I then linked my stub executable with the external library in
addition and then everything worked fine.



In fact, I went ahead and changed the src/vlib/CMakeLists.txt so that
external lib links with vlib. This works fine for me.


I just wanted to find out, if there is any generic infra available to link
additional external libraries to say, vlib, without fiddling around with
the build system of VPP.

Regards,
Siddarth

On Thu, Jan 2, 2020 at 7:38 PM Damjan Marion  wrote:

>
> 99% of vpp code is not in vpp executable so i wander why do you want to do
> that? both some of vpp standard libraries (vnet, vlib, ..) and some of vpp
> plugins are linked against libs, so to be able to help you i need more
> details...
>
> --
> Damjan
>
> On 2 Jan 2020, at 14:20, siddarth rai  wrote:
>
> 
> Hi,
>
> I mean only 'vpp executable'
>
> Regards,
> Siddarth
>
> On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion  wrote:
>
>>
>> what do you mean by “vpp executable lib”? can you provide more details
>> what exactly do you want to do?
>>
>> --
>> Damjan
>>
>> > On 2 Jan 2020, at 12:27, siddarth rai  wrote:
>> >
>> > 
>> > Hello,
>> >
>> > I am working on VPP 1908.
>> > I want to link some external non-vpp libraries to my vpp executable lib.
>> >
>> > Would it work if I add the path of external lib to vlib/CMakeLists.txt
>> file using 'LINK_LIBRARIES' ?
>> >
>> > Can anyone tell if this is the right way or if there is any other way ?
>> >
>> > Any help will be appreciated.
>> >
>> > Thank you,
>> > Siddarth
>> > -=-=-=-=-=-=-=-=-=-=-=-
>> > Links: You receive all messages sent to this group.
>> >
>> > View/Reply Online (#15013): https://lists.fd.io/g/vpp-dev/message/15013
>> > Mute This Topic: https://lists.fd.io/mt/69378301/675642
>> > Group Owner: vpp-dev+ow...@lists.fd.io
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>> > -=-=-=-=-=-=-=-=-=-=-=-
>>
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-02 Thread Damjan Marion via Lists.Fd.Io

99% of vpp code is not in vpp executable so i wander why do you want to do 
that? both some of vpp standard libraries (vnet, vlib, ..) and some of vpp 
plugins are linked against libs, so to be able to help you i need more 
details...

-- 
Damjan

> On 2 Jan 2020, at 14:20, siddarth rai  wrote:
> 
> 
> Hi,
> 
> I mean only 'vpp executable'
> 
> Regards,
> Siddarth
> 
>> On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion  wrote:
>> 
>> what do you mean by “vpp executable lib”? can you provide more details what 
>> exactly do you want to do?
>> 
>> -- 
>> Damjan
>> 
>> > On 2 Jan 2020, at 12:27, siddarth rai  wrote:
>> > 
>> > 
>> > Hello,
>> > 
>> > I am working on VPP 1908.
>> > I want to link some external non-vpp libraries to my vpp executable lib.
>> > 
>> > Would it work if I add the path of external lib to vlib/CMakeLists.txt 
>> > file using 'LINK_LIBRARIES' ? 
>> > 
>> > Can anyone tell if this is the right way or if there is any other way ?
>> > 
>> > Any help will be appreciated.
>> > 
>> > Thank you,
>> > Siddarth
>> > -=-=-=-=-=-=-=-=-=-=-=-
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>> > 
>> > View/Reply Online (#15013): https://lists.fd.io/g/vpp-dev/message/15013
>> > Mute This Topic: https://lists.fd.io/mt/69378301/675642
>> > Group Owner: vpp-dev+ow...@lists.fd.io
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>> 
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-02 Thread siddarth rai
Hi,

I mean only 'vpp executable'

Regards,
Siddarth

On Thu, Jan 2, 2020 at 5:10 PM Damjan Marion  wrote:

>
> what do you mean by “vpp executable lib”? can you provide more details
> what exactly do you want to do?
>
> --
> Damjan
>
> > On 2 Jan 2020, at 12:27, siddarth rai  wrote:
> >
> > 
> > Hello,
> >
> > I am working on VPP 1908.
> > I want to link some external non-vpp libraries to my vpp executable lib.
> >
> > Would it work if I add the path of external lib to vlib/CMakeLists.txt
> file using 'LINK_LIBRARIES' ?
> >
> > Can anyone tell if this is the right way or if there is any other way ?
> >
> > Any help will be appreciated.
> >
> > Thank you,
> > Siddarth
> > -=-=-=-=-=-=-=-=-=-=-=-
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Re: [vpp-dev] Linking external libraries to VPP executable

2020-01-02 Thread Damjan Marion via Lists.Fd.Io

what do you mean by “vpp executable lib”? can you provide more details what 
exactly do you want to do?

-- 
Damjan

> On 2 Jan 2020, at 12:27, siddarth rai  wrote:
> 
> 
> Hello,
> 
> I am working on VPP 1908.
> I want to link some external non-vpp libraries to my vpp executable lib.
> 
> Would it work if I add the path of external lib to vlib/CMakeLists.txt file 
> using 'LINK_LIBRARIES' ? 
> 
> Can anyone tell if this is the right way or if there is any other way ?
> 
> Any help will be appreciated.
> 
> Thank you,
> Siddarth
> -=-=-=-=-=-=-=-=-=-=-=-
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