pcsx2/cmake/FindPCAP.cmake

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CMake
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# - Try to find libpcap include dirs and libraries
#
# Usage of this module as follows:
#
# find_package(PCAP)
#
# Variables used by this module, they can change the default behaviour and need
# to be set before calling find_package:
#
# PCAP_ROOT_DIR Set this variable to the root installation of
# libpcap if the module has problems finding the
# proper installation path.
#
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# Imported Targets:
# PCAP::PCAP The libpcap library, if found
#
# Variables defined by this module:
#
# PCAP_FOUND System has libpcap, include and library dirs found
# PCAP_INCLUDE_DIR The libpcap include directories.
# PCAP_LIBRARY The libpcap library (possibly includes a thread
# library e.g. required by pf_ring's libpcap)
# HAVE_PF_RING If a found version of libpcap supports PF_RING
find_path(PCAP_ROOT_DIR
NAMES include/pcap.h
)
find_path(PCAP_INCLUDE_DIR
NAMES pcap.h
HINTS ${PCAP_ROOT_DIR}/include
)
find_library(PCAP_LIBRARY
NAMES pcap
HINTS ${PCAP_ROOT_DIR}/lib
)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(PCAP DEFAULT_MSG
PCAP_LIBRARY
PCAP_INCLUDE_DIR
)
include(CheckCSourceCompiles)
set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
check_c_source_compiles("int main() { return 0; }" PCAP_LINKS_SOLO)
set(CMAKE_REQUIRED_LIBRARIES)
# check if linking against libpcap also needs to link against a thread library
if (NOT PCAP_LINKS_SOLO)
find_package(Threads)
if (THREADS_FOUND)
set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
check_c_source_compiles("int main() { return 0; }" PCAP_NEEDS_THREADS)
set(CMAKE_REQUIRED_LIBRARIES)
endif ()
if (THREADS_FOUND AND PCAP_NEEDS_THREADS)
set(_tmp ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
list(REMOVE_DUPLICATES _tmp)
set(PCAP_LIBRARY ${_tmp}
CACHE STRING "Libraries needed to link against libpcap" FORCE)
else ()
message(FATAL_ERROR "Couldn't determine how to link against libpcap")
endif ()
endif ()
include(CheckFunctionExists)
set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
check_function_exists(pcap_get_pfring_id HAVE_PF_RING)
set(CMAKE_REQUIRED_LIBRARIES)
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if(PCAP_LIBRARY AND NOT TARGET PCAP::PCAP)
add_library(PCAP::PCAP UNKNOWN IMPORTED GLOBAL)
set_target_properties(PCAP::PCAP PROPERTIES
IMPORTED_LOCATION "${PCAP_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${PCAP_INCLUDE_DIR}")
endif()
mark_as_advanced(
PCAP_ROOT_DIR
PCAP_INCLUDE_DIR
PCAP_LIBRARY
)