Re: [dpdk-dev] [PATCH 2/8] doc: add building with meson to linux GSG

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 22-Nov-19 4:03 PM, Bruce Richardson wrote:
> Add instructions on building DPDK and using the pkg-config file to the
> linux GSG.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---

<snip>

> +
> +Building Applications Using Installed DPDK
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +When installed system-wide, DPDK provides a pkg-config file ``libdpdk.pc`` for applications to query as part of their build.
> +It's recommended that the pkg-config file be used, rather than hard-coding the parameters (cflags/ldflags)
> +for DPDK into the application build process.
> +
> +An example of how to query and use the pkg-config file can be found in the ``Makefile`` of each of the example applications included with DPDK.
> +A simplified example snippet is shown below, where the target binary name has been stored in the variable ``$(APP)``
> +and the sources for that build are stored in ``$(SRCS-y)``.
> +
> +.. code-block:: makefile
> +
> +        PKGCONF = pkg-config
> +
> +        CFLAGS += -O3 $(shell $(PKGCONF) --cflags libdpdk)
> +        LDFLAGS += $(shell $(PKGCONF) --libs libdpdk)
> +
> +        $(APP): $(SRCS-y) Makefile
> +                $(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS)

Also, as we have recently discovered, enabling DPDK libraries 
system-wide may not be so trivial after all, and may involve running 
ldconfig and/or modifying the /etc/ld.so.conf.d/ to include the locally 
built libraries. Should we include this as well? An argument can be made 
that this is distro-specific and shouldn't be in this guide, but these 
problems happen on distros that are common enough and are explicitly 
supported by DPDK, so perhaps /some/ note on possible issues with 
library search paths should be present?

-- 
Thanks,
Anatoly