RE: Port to embedded platform

Thanks for the info.
I was able to link with the .a files generated as you indicated.

Because I need to run net-snmp internally via init_master_agent I have to call init_mib_modules.

However, even though init_mib_modules is in libnetsnmpmibs.a when I include it as a library in my link I get an undefined reference to `init_mib_modules()'

So what is the reason that I am not able to call this function yet I can call init_master_agent?

I am also unable to call init_udp, init_tcp etc..

Any info on this would be greatly appreciated.
thanks

-----Original Message-----
From: Vincent Bernat [mailto:[email protected]] 
Sent: Tuesday, June 16, 2009 12:29 PM
To: Joan Landry
Cc: [email protected]
Subject: Re: Port to embedded platform

OoO  Peu avant  le début  de l'après-midi  du mardi  16 juin  2009, vers 13:57, "Joan Landry" <[email protected]> disait :

> I am  trying to port  net-snmp to an  embedded platform and  have been 
> able to use ./configure and make  to cross compile the code.  Now I am 
> not  sure what  the next  step is.  I see  there are  directories that
> contain     libnetsnmpagent.la     libnetsnmp.la     libnetsnmpmibs.la
> libnetsnmptrapd.la libsnmp.la But  it is not clear to  me what files I 
> need and how to link them into my system.

Those files  are used by  libtool. Do you  want to statically  link your program to those libraries (you  would then need .a) or dynamically (you would need .so). You can also use libtool to achieve this.

> Can anyone tell me where I can find an example of this? Or give me any 
> pointers on what to do next.

> I want to be able to call the folling functions from my subagent.
>     init_agent()
>     init_mib_modules()
>     init_snmp()
>     init_master_agent()

You can use objdump -x on each .a to get this information.

init_agent() is in libnetsnmpagent.a.
0000000000000300 g     F .text	000000000000017a init_agent
init_mib_modules() is in libnetsnmpmibs.a
0000000000000000 g     F .text	0000000000000cfd init_mib_modules
init_snmp is in libnetsnmp.a
0000000000008480 g     F .text	00000000000002bd init_snmp
init_master_agent is in libnetsnmpagent.a
0000000000003220 g     F .text	000000000000041c init_master_agent

I think that for an agent, you don't need init_mib_modules(). Therefore, you can  just link to  libnetsnmp.a and libnetsnmpagent.a.  Depending on what you use in your agent, you may also need libnetsnmphelpers.a.

However,  the easiest  way to  do  this is  to link  everything. If  you statically link libraries, only needed bits will be included. Otherwise, use --as-needed flag of ld (or -Wl,--as-needed with gcc).
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