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