forked from osmocom/wireshark
Use pkg-config if possible; if not, use pcap-config if present.
First try finding libpcap with pkg-config. If that fails (either because the system doesn't have pkg-config or because it does but there's no .pc file for libpcap), check for pcap-config and, if it's present, use that, otherwise fall back on manually searching for it. Pick up the code from tcpdump's FindPCAP.cmake. Change-Id: I87963aaa7cccac0b5cd942f48eb5d08779695f92 Reviewed-on: https://code.wireshark.org/review/32992 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot Reviewed-by: Guy Harris <guy@alum.mit.edu>
This commit is contained in:
Guy Harris
parent
d0ce55289b
commit
c602119bcf
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@ -15,45 +15,234 @@ if( WIN32 AND "${WIRESHARK_TARGET_PLATFORM}" STREQUAL "win64" )
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set ( _PLATFORM_SUBDIR "/x64" )
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endif()
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find_path( PCAP_INCLUDE_DIR
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NAMES
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pcap/pcap.h
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pcap.h
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HINTS
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"${PCAP_HINTS}/include"
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)
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#
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# First, try pkg-config.
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#
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find_package( PkgConfig )
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pkg_search_module( PCAP libpcap )
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find_library( PCAP_LIBRARY
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NAMES
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pcap
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wpcap
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HINTS
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"${PCAP_HINTS}/lib${_PLATFORM_SUBDIR}"
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)
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if( PCAP_FOUND )
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#
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# That worked.
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# Now, for each library, try to find it, so we get its full path.
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# CMake *really* doesn't like the notion of specifying "here are
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# the directories in which to look for libraries" except in
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# find_library() calls; it *really* prefers using full paths to
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# library files, rather than library names.
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#
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set( _pcap_libraries "${PCAP_LIBRARIES}" )
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set( PCAP_LIBRARIES "" )
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foreach( _lib IN LISTS _pcap_libraries )
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#
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# Try to find that library.
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#
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find_library( _libfullpath ${_lib} HINTS ${PCAP_LIBRARY_DIRS} )
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list( APPEND PCAP_LIBRARIES ${_libfullpath} )
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#
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# Remove that from the cache; we're using it as a local variable,
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# but find_library insists on making it a cache variable.
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#
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unset( _libfullpath CACHE )
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endforeach()
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#
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# Now find the static libraries.
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# (XXX - what about AIX?)
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#
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set( _pcap_static_libraries "${PCAP_STATIC_LIBRARIES}" )
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set( PCAP_STATIC_LIBRARIES "" )
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set( SAVED_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}" )
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set( CMAKE_FIND_LIBRARY_SUFFIXES ".a" )
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foreach( _lib IN LISTS _pcap_static_libraries )
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#
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# Try to find that library, so we get its full path, as
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# we do with dynamic libraries.
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#
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find_library( _libfullpath ${_lib} HINTS ${PCAP_LIBRARY_DIRS} )
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list( APPEND PCAP_STATIC_LIBRARIES ${_libfullpath} )
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#
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# Remove that from the cache; we're using it as a local variable,
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# but find_library insists on making it a cache variable.
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#
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unset( _libfullpath CACHE )
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endforeach()
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set( CMAKE_FIND_LIBRARY_SUFFIXES "${SAVED_CMAKE_FIND_LIBRARY_SUFFIXES}" )
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else( PCAP_FOUND )
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#
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# That didn't work. Try pcap-config.
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#
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find_program( PCAP_CONFIG pcap-config )
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if( PCAP_CONFIG )
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#
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# We have pcap-config; use it.
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# XXX - what if this is on Windows? If you're using, for example,
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# MinGW, that might be the right thing to do, *if* pcap-config
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# were made to work properly on Windows, but what about MSVC?
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#
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# First, get the include directory.
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#
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execute_process( COMMAND "${PCAP_CONFIG}" "--cflags"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if( NOT PCAP_CONFIG_RESULT EQUAL 0 )
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message( FATAL_ERROR "pcap-config --cflags failed" )
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endif()
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#
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# XXX - this assumes that there's only one -I flag in the output
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# of pcap-config --cflags. That *should* be the case.
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#
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string(REGEX REPLACE "-I" "" _pcap_include_dir "${PCAP_CONFIG_OUTPUT}")
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# Try to find the header
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# We use what pcap-config provided as a hint, because the
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# pcap-config that ships with macOS bogusly supplies
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# -I/usr/local/include even though the header isn't
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# there (it may be under /usr/include or it may be
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# buried in the Xcode app bundle).
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find_path(PCAP_INCLUDE_DIRS pcap.h HINTS ${_pcap_include_dir})
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# Now, get the libraries.
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execute_process( COMMAND "${PCAP_CONFIG}" "--libs"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if( NOT PCAP_CONFIG_RESULT EQUAL 0 )
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message( FATAL_ERROR "pcap-config --libs failed" )
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endif()
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separate_arguments( LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT} )
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set( _pcap_library_dirs "" )
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set( PCAP_LIBRARIES "" )
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foreach( _arg IN LISTS LIBS_LIST )
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if( _arg MATCHES "^-L" )
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# Add this directory to _pcap_library_dirs
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string( REGEX REPLACE "-L" "" _dir ${_arg} )
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list( APPEND _pcap_library_dirs ${_dir} )
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elseif( _arg MATCHES "^-l" )
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string( REGEX REPLACE "-l" "" _lib ${_arg} )
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#
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# Try to find that library, so we get its full path. See the
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# comment above for why we do this.
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#
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# Furthermore, the pcap-config shipped with macOS reports
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# -I/usr/local/include for --cflags and -L/usr/local/lib for
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# --libs, rather than reporting the appropriate system (or
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# Xcode application) directory.
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#
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find_library( _libfullpath ${_lib} HINTS ${__pcap_library_dirs} )
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list( APPEND PCAP_LIBRARIES ${_libfullpath} )
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#
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# Remove that from the cache; we're using it as a local variable,
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# but find_library insists on making it a cache variable.
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#
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unset( _libfullpath CACHE )
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endif()
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endforeach()
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# Now, get the library directories and libraries for static linking.
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# (XXX - what about AIX?)
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execute_process( COMMAND "${PCAP_CONFIG}" "--libs" "--static"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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)
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if( NOT PCAP_CONFIG_RESULT EQUAL 0 )
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message( FATAL_ERROR "pcap-config --libs --static failed" )
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endif()
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separate_arguments( LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT} )
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set( _pcap_static_library_dirs "" )
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set( PCAP_STATIC_LIBRARIES "" )
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set( SAVED_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}" )
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set( CMAKE_FIND_LIBRARY_SUFFIXES ".a" )
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foreach( _arg IN LISTS LIBS_LIST )
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if( _arg MATCHES "^-L" )
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# Add this directory to _pcap_static_library_dirs
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string( REGEX REPLACE "-L" "" _dir ${_arg} )
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list( APPEND _pcap_static_library_dirs ${_dir} )
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elseif( _arg MATCHES "^-l" )
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string( REGEX REPLACE "-l" "" _lib ${_arg} )
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#
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# Try to find that library, so we get its full path, as
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# we do with dynamic libraries.
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#
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find_library( _libfullpath ${_lib} HINTS ${__pcap_static_library_dirs} )
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list( APPEND PCAP_STATIC_LIBRARIES ${_libfullpath} )
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#
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# Remove that from the cache; we're using it as a local variable,
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# but find_library insists on making it a cache variable.
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#
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unset( _libfullpath CACHE )
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endif()
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endforeach()
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set( CMAKE_FIND_LIBRARY_SUFFIXES "${SAVED_CMAKE_FIND_LIBRARY_SUFFIXES}" )
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else( PCAP_CONFIG )
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#
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# We don't have pcap-config.
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# Try to find the header by just looking for it in whatever
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# directories find_path() uses by default, plus ${PCAP_HINTS}.
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#
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find_path( PCAP_INCLUDE_DIRS
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NAMES
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pcap/pcap.h
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pcap.h
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HINTS
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"${PCAP_HINTS}/include"
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)
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# Try to find the library
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if( WIN32 )
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# The 64-bit Packet.lib is located under /x64
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if( "${WIRESHARK_TARGET_PLATFORM}" STREQUAL "win64" )
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#
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# For the WinPcap and Npcap SDKs, the Lib subdirectory of the top-level
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# directory contains 32-bit libraries; the 64-bit libraries are in the
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# Lib/x64 directory.
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#
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# The only way to *FORCE* CMake to look in the Lib/x64 directory
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# without searching in the Lib directory first appears to be to set
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# CMAKE_LIBRARY_ARCHITECTURE to "x64".
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#
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set(CMAKE_LIBRARY_ARCHITECTURE "x64")
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endif()
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endif()
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find_library( PCAP_LIBRARIES
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NAMES
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pcap
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wpcap
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HINTS
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"${PCAP_HINTS}/lib${_PLATFORM_SUBDIR}"
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)
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if( NOT WIN32 )
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# Try to find the static library (XXX - what about AIX?)
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set( SAVED_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}")
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set( CMAKE_FIND_LIBRARY_SUFFIXES ".a" )
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find_library( PCAP_STATIC_LIBRARIES
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NAMES
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pcap
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wpcap
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HINTS
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"${PCAP_HINTS}/lib${_PLATFORM_SUBDIR}"
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)
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set( CMAKE_FIND_LIBRARY_SUFFIXES "${SAVED_CMAKE_FIND_LIBRARY_SUFFIXES}")
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endif( NOT WIN32 )
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endif( PCAP_CONFIG )
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endif( PCAP_FOUND )
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include( FindPackageHandleStandardArgs )
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find_package_handle_standard_args( PCAP DEFAULT_MSG PCAP_LIBRARY PCAP_INCLUDE_DIR )
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find_package_handle_standard_args( PCAP DEFAULT_MSG PCAP_LIBRARIES PCAP_INCLUDE_DIRS )
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mark_as_advanced( PCAP_INCLUDE_DIR PCAP_LIBRARY PCAP_STATIC_LIBRARY )
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if( PCAP_FOUND )
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set( PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR} )
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set( PCAP_LIBRARIES ${PCAP_LIBRARY} )
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# Include transitive dependencies for static linking.
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# This requires:
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# 1) a system with pkg-config installed
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# 2) libpcap >= 1.9.0 with its .pc files installed
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if( UNIX AND CMAKE_FIND_LIBRARY_SUFFIXES STREQUAL ".a" )
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find_package( PkgConfig )
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pkg_search_module( PC_LIBPCAP libpcap )
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list( APPEND PCAP_LIBRARIES ${PC_LIBPCAP_LIBRARIES} )
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set( PCAP_LIBRARIES ${PCAP_STATIC_LIBRARIES} )
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endif()
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else()
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set( PCAP_INCLUDE_DIRS )
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set( PCAP_LIBRARIES )
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endif()
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if( PCAP_FOUND )
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#Functions
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include( CMakePushCheckState )
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include( CheckFunctionExists )
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@ -143,5 +332,3 @@ if( PCAP_FOUND )
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cmake_pop_check_state()
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endif()
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mark_as_advanced( PCAP_LIBRARIES PCAP_INCLUDE_DIRS )
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