# Try to find dpdk
#
# Once done, this will define
#
# dpdk_FOUND
# dpdk_INCLUDE_DIRS
# dpdk_LIBRARIES
# dpdk_STATIC_LIBRARIES
# dpdk_LIBS_STATIC
# dpdk_REQUIRES_PRIVATE
# dpdk_PACKAGE_NAME
#
# We only try to find DPDK using pkg-config; DPDK is *SO*
# complicated - DPDK 19.02, for example, has about 117(!)
# libraries, and the precise set of libraries required has
# changed over time - so attempting to guess which libraries
# you need, and hardcoding that in an attempt to find the
# libraries without DPDK, rather than relying on DPDK to
# tell you, with a .pc file, what libraries are needed,
# is *EXTREMELY* fragile and has caused some bug reports,
# so we're just not going to do it.
#
# If that causes a problem, the only thing we will do is
# accept an alternative way of finding the appropriate
# library set for the installed version of DPDK that is
# as robust as pkg-config (i.e., it had better work as well
# as pkg-config with *ALL* versions of DPDK that provide a
# libdpdk.pc file).
#
# If dpdk_ROOT is set, add ${dpdk_ROOT}/pkgconfig
# to PKG_CONFIG_PATH, so we look for the .pc file there,
# first.
#
if(PKG_CONFIG_FOUND)
set(save_PKG_CONFIG_PATH $ENV{PKG_CONFIG_PATH})
if(dpdk_ROOT)
set(ENV{PKG_CONFIG_PATH} "${dpdk_ROOT}/pkgconfig:$ENV{PKG_CONFIG_PATH}")
endif()
pkg_check_modules(dpdk QUIET libdpdk)
if(dpdk_FOUND)
#
# Get link information for DPDK.
#
pkg_get_link_info(dpdk libdpdk)
endif()
set(ENV{PKG_CONFIG_PATH} "${save_PKG_CONFIG_PATH}")
endif()
if(dpdk_FOUND)
#
# This depends on CMake support for "imported targets",
# which are not supported until CMake 3.19.
#
# Ubuntu 20.04 provides CMake 3.16.3, so we are *NOT*
# going to require CMake 3.19. If you want to use
# Shiny New Features(TM), wait until all the OSes on
# which a build might conceivably be done, and that
# provide CMake, provide 3.19 or later.
#
# Just don't do this stuff on earlier versions. If that
# breaks something, figure out a way to do it *without*
# "imported targets", and either do this that way, or,
# at least, do it that way on older versions of CMake.
#
# (One good thing about autotools is that only the builders
# of a package, and people doing configure-script development,
# have to care about the autoconf etc. version; you don't
# even need to have autotools installed in order to be able
# to run an autotools-generated configure script, you just
# need an environment UN*Xy enough, and modern enough, to
# run the stuff in the script.
#
# This is *NOT* the case for CMake; not only do you need
# CMake in order to build a package using CMake, you need
# a version recent enough to run the stuff the package's
# CMake files use.
#
# Please keep this in mind when changing any CMake files,
# and keep in mind what versions of CMake come with, for
# example, commonly-used versions of commonly-used
# Linux distributions.)
#
if(NOT CMAKE_VERSION VERSION_LESS 3.19)
if(NOT TARGET dpdk::cflags)
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
set(rte_cflags "-march=core2")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm|ARM")
set(rte_cflags "-march=armv7-a")
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
set(rte_cflags "-march=armv8-a+crc")
endif()
add_library(dpdk::cflags INTERFACE IMPORTED)
if (rte_cflags)
set_target_properties(dpdk::cflags PROPERTIES
INTERFACE_COMPILE_OPTIONS "${rte_cflags}")
endif()
endif()
