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To: "Lu, Patrick" <patrick.lu@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Date: Fri, 16 Sep 2016 19:05:16 +0100
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Subject: Re: [dpdk-dev] How to include pre-build object file (.o) in DPDK
 makefile?
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On 9/16/2016 6:04 PM, Lu, Patrick wrote:
> Hi,
> 
> I'm trying to include some hand written assembly (compiled by yasm) in my DPDK program. I couldn't find any example linking the DPDK C code with pre-compiled .o file. I've searched the mk/ and found OBJS-y seems the right variable to include .o file, but when generating the final executable, OBJS-y contains only main.o (generating from main.c).
> 
> I've tried to put my .o file in both source directory as well as build/
> 

Possible to use EXTRA_LDLIBS to provide the object file name, and put
object file into build folder.

Following example worked for me:

$ nm foo.o
0000000000000000 T foo

$ cp foo.o examples/skeleton/build/

$ make -C examples/skeleton EXTRA_LDLIBS="foo.o"
make: Entering directory '.../examples/skeleton'
  CC basicfwd.o
  LD basicfwd
  INSTALL-APP basicfwd
  INSTALL-MAP basicfwd.map
make: Leaving directory '.../examples/skeleton'

$ nm examples/skeleton/build/basicfwd | grep foo
000000000055fd1d T foo