On Fri, Sep 16, 2016 at 06:30:10PM +0000, Lu, Patrick wrote: > -----Original Message----- > From: Yigit, Ferruh > Sent: Friday, September 16, 2016 11:05 AM > To: Lu, Patrick <patrick.lu at intel.com>; dev at dpdk.org > Subject: Re: [dpdk-dev] How to include pre-build object file (.o) in DPDK > makefile? > > 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 > > Perfect! This works for me. > Just out of curiosity, why not just specify the source file in SRCS-y for your target binary? rte.pre-compile.mk has an assembly target for .S->.o transitions.
Neil > Sincerely, > > Patrick > >
