Hi,
> >I tried debugging the `Makefile` via `make D=1` but it doesn't output any
> >debug
> >information before failing on abovementioned message.
>
> You need to run "make V=1" in order to get debug messages in the build
> process,
> and not D=1. I would suggest that you will try again with V=1 and post the log
> here.
The "V=1" option only turns it to verbose mode which prints the command that is
being run.
Unfortunately due to the way the extapp.rte.mk Makefile is done it doesn't
print anything useful.
The "D=1" actually shows what targets are run and why for a dry (i.e. after
`make clean`) run. When
(at least the tst.o) is build, however, it simply fails on it with the
previously mentioned message without
outputting anything useful.
t-***@***-Virtual-Machine:~/dev/dpdk-18.05/examples/helloworld$ make V=1
mkdir -p /home/t-pehous/dev/dpdk-18.05/examples/helloworld/build
make -C /home/t-pehous/dev/dpdk-18.05/examples/helloworld/build -f
/home/t-pehous/dev/dpdk-18.05/examples/helloworld/Makefile \
S=/home/t-pehous/dev/dpdk-18.05/examples/helloworld
O=/home/t-pehous/dev/dpdk-18.05/examples/helloworld/build
SRCDIR=/home/t-pehous/dev/dpdk-18.05/examples/helloworld
make[1]: Nothing to be done for 'tst.o'.
> Second, where is the Makefile (with SRC-y) that you mentioned located ?
> If I understand correctly, you added the "tst" folder under the root DPDK
> tree.
No, that's not the case. I added it to the project's root and so the FS
structure is following.
examples/helloworld
|-main.c
|-Makefile
|-tst //This is the folder I added
|-tst.c //This is the file I added
And the contents of Makefile are following (the rest is without any changes):
# SPDX-License-Identifier: BSD-3-Clause
# Copyright(c) 2010-2014 Intel Corporation
# binary name
APP = helloworld
# all source are stored in SRCS-y | I added the tst/tst.c entry
SRCS-y := main.c \
tst/tst.c
...the rest of example's makefile
> Third: usually applications are added under the examples folder or the app
> folder, and you can follow recent patches of adding app under examples, unless
> it is mandatory that the tst folder you added will be under the root DPDK
> folder.
Just to be clear this has nothing to the with the helloworld app / being
located within
the examples folder of DPDK's root. Whenever you create a DPDK app _anywhere_,
use the advised way of creating Makefile (i.e. include extapp.rte.mk) and have
source file
that you add to SRC-y in a subfolder of current's project root the same issue
happens.
I only chose the helloworld example to create a simple repro for you.
Regards Petr Houska
