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CMakeLists.txt
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if(WIN32)
#
# We need 3.12 or later, so that we can set policy CMP0074; see
# below.
#
cmake_minimum_required(VERSION 3.12)
else(WIN32)
#
# For now:
#
# if this is a version of CMake less than 3.5, require only
# 2.8.12, just in case somebody is configuring with CMake
# on a "long-term support" version # of some OS and that
# version supplies an older version of CMake;
#
# otherwise, if it's a version less than 3.10, require only
# 3.5, just in case somebody is configuring with CMake
# on a "long-term support" version # of some OS and that
# version supplies an older version of CMake;
#
# otherwise, require 3.10, so we don't get messages warning
# that support for versions of CMake lower than 3.10 is
# deprecated.
#
if(CMAKE_VERSION VERSION_LESS "3.5")
cmake_minimum_required(VERSION 2.8.12)
elseif(CMAKE_VERSION VERSION_LESS "3.10")
cmake_minimum_required(VERSION 3.5)
else()
cmake_minimum_required(VERSION 3.10)
endif()
endif(WIN32)
#
# Apple doesn't build with an install_name starting with @rpath, and
# neither do we with autotools; don't do so with CMake, either, and
# suppress warnings about that.
#
# Setting CMAKE_MACOSX_RPATH to FALSE uses the old behavior,
# but removes the POLICY CMP0042 OLD deprecated warning.
# See https://cmake.org/cmake/help/latest/policy/CMP0042.html
#
if (NOT DEFINED CMAKE_MACOSX_RPATH)
set(CMAKE_MACOSX_RPATH FALSE)
endif()
if(POLICY CMP0042)
cmake_policy(SET CMP0042 NEW)
endif()
#
# Squelch noise about quoted strings in if() statements.
# WE KNOW WHAT WE'RE DOING, WE'RE DOING EVERYTHING THE WAY THAT NEWER
# VERSIONS OF CMAKE EXPECT BY DEFAULT, DON'T WASTE OUR TIME WITH NOISE.
#
if(POLICY CMP0054)
cmake_policy(SET CMP0054 NEW)
endif()
#
# We want find_file() and find_library() to honor {packagename}_ROOT,
# as that appears to be the only way, with the Visual Studio 2019 IDE
# and its CMake support, to tell CMake where to look for the Npcap
# or WinPcap SDK.
#
if(POLICY CMP0074)
cmake_policy(SET CMP0074 NEW)
endif()
#
# We want check_include_file() to honor CMAKE_REQUIRED_LIBRARIES; see
# the big comment before the check_include_file() test for
# infiniband/verbs.h for the reason.
#
if(POLICY CMP0075)
cmake_policy(SET CMP0075 NEW)
endif()
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules)
#
# We explicitly indicate what languages are used in libpcap to avoid
# checking for a C++ compiler.
#
# One reason to avoid that check is that there's no need to waste
# configuration time performing it.
#
# Another reason is that:
#
# CMake will try to determine the sizes of some data types, including
# void *, early in the process of configuration; apparently, it's done
# as part of processing the project() command.
#
# At least as of CMake 2.8.6, it does so by checking the size of
# "void *" in C, setting CMAKE_C_SIZEOF_DATA_PTR based on that,
# setting CMAKE_SIZEOF_VOID_P to that, and then checking the size
# of "void *" in C++, setting CMAKE_CXX_SIZEOF_DATA_PTR based on
# that, and then setting CMAKE_SIZEOF_VOID_P to *that*.
#
# The compile tests include whatever C flags may have been provided
# to CMake in the CFLAGS and CXXFLAGS environment variables.
#
# If you set an architecture flag such as -m32 or -m64 in CFLAGS
# but *not* in CXXFLAGS, the size for C++ will win, and hilarity
# will ensue.
#
# Or if, at least on Solaris, you have a newer version of GCC
# installed, but *not* a newer version of G++, and you have Oracle
# Studio installed, it will find GCC, which will default to building
# 64-bit, and Oracle Studio's C++ compiler, which will default to
# building 32-bit, the size for C++ will win, and, again, hilarity
# will ensue.
#
project(pcap C)
#
# Export the size of void * as SIZEOF_VOID_P so that it can be
# tested with #if.
#
set(SIZEOF_VOID_P "${CMAKE_SIZEOF_VOID_P}")
#
# Setting CMAKE_MACOSX_RPATH to FALSE causes the installed
# libpcap.A.dylib to have just libpcap.A.dylib as the install
# name; Apple built libpcap with an install_name of /usr/lib/libpcap.A.dylib
# (back when they still shipped individual system dylibs rather than
# shipping a pre-built shared library cache, at least), and we do the
# same with autotools; do the same with CMake.
#
if (NOT DEFINED CMAKE_INSTALL_NAME_DIR)
set(CMAKE_INSTALL_NAME_DIR ${CMAKE_INSTALL_PREFIX}/lib)
endif()
#
# For getting raw lists of --libs and --libs --static information from a
# pkg-config module.
#
# In CMake up to 2.8.12, pkg_check_modules() sets:
#
# <XPREFIX>_LIBRARIES, which is a list of library names to which, on
# a UN*X, -l can be prefixed - i.e., names, without extensions,
# rather than full paths to the file.
# <XPREFIX>_LIBRARY_DIRS, which is a list of paths to directories
# containing the libraries, to which, on a UN*X, -L can be
# prefixed.
# <XPREFIX>_LDFLAGS, which is a list of *all* required linker flags
# <XPREFIX>_LDFLAGS_OTHER, which is a list of all linker flags other
# than -l and -L flags
#
# In 3.0 (at least as of 3.0.2), it also sets:
#
# <XPREFIX>_LINK_LIBRARIES, which is a list of full paths to the
# library files.
#
# but if <XPREFIX> is <PREFIX>_STATIC, <XPREFIX>_LINK_LIBRARIES is
# currently not set by CMake.
#
# Unfortunately, pkg_check_modules() sets the
# PKG_CONFIG_ALLOW_SYSTEM_LIBS environment variable when running
# pkg-config, so the output of --libs, etc. may include a -L for the
# system library, which we do *NOT* want to put in our libpcap.pc and
# pcap-config files.
#
# So we just run pkg-config ourselves, so that we get its output
# directly without any processing by CMake.
#
macro(pkg_get_link_info _prefix _package)
if (PKG_CONFIG_EXECUTABLE)
#
# Get the --libs information.
#
# We force PKG_CONFIG_ALLOW_SYSTEM_LIBS to be undefined, as
# at least some versions of CMake appear to define it in
# pkg_check_modules() before running pkg-config and *not* undefine
# it after running it.
#
unset(ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS})
set(_pkg_config_result "")
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} "--libs" ${_package}
OUTPUT_VARIABLE _pkg_config_result
RESULT_VARIABLE _pkg_config_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
if (_pkg_config_failed)
#
# pkg-config failed; assume that means that there is no such
# package for it to find. XXX - what do we do here?
#
set(${_prefix}_FOUND_WITH_PKG_CONFIG FALSE)
else()
#
# pkg-config succeeded; replace CR and LF with spaces.
#
string(REGEX REPLACE "[\r\n]" " " ${_prefix}_LIBS "${_pkg_config_result}")
#
# Now get the --libs --static information.
#
set(_pkg_config_result "")
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} "--libs" "--static" ${_package}
OUTPUT_VARIABLE _pkg_config_result
RESULT_VARIABLE _pkg_config_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
if (_pkg_config_failed)
#
# pkg-config failed; assume that means that there is no such
# package for it to find. XXX - what do we do here?
#
set(${_prefix}_FOUND_WITH_PKG_CONFIG FALSE)
else()
#
# pkg-config succeeded; replace CR and LF with spaces.
#
string(REGEX REPLACE "[\r\n]" " " ${_prefix}_LIBS_STATIC "${_pkg_config_result}")
#
# List this package in its PACKAGE_NAME variable.
#
set(${_prefix}_PACKAGE_NAME "${_package}")
#
# It worked.
#
set(${_prefix}_FOUND_WITH_PKG_CONFIG TRUE)
endif()
endif()
endif()
endmacro()
macro(get_link_info_from_library_path _library_prefix _library_name)
if(NOT ${_library_prefix}_LIBRARY STREQUAL "${_library_prefix}_LIBRARY-NOTFOUND")
get_filename_component(_lib_directory "${${_library_prefix}_LIBRARY}}" DIRECTORY)
#
# The closest thing to a list of "system library directories" in
# which the linker will, by default, search for libraries appears to
# be CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES, so that's what we use
# when we're trying to construct a -L argument, for insertion into
# pcap-config and libpcap.pc, for a library upon which we depend.
#
# In some versions of CMake it appears to have duplicate entries,
# but that shouldn't affect a search for a directory in that list.
#
list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${_lib_directory}" _lib_index)
if(_lib_index EQUAL -1)
#
# No, so add a -L flag to get the linker to search in that
# directory.
#
set(${_library_prefix}_LIBS "-L${_lib_directory}")
set(${_library_prefix}_LIBS_STATIC "-L${_lib_directory}")
set(${_libraryprefix}_LIBS_PRIVATE "-L${_lib_directory}")
endif()
set(${_library_prefix}_LIBS "${${_library_prefix}_LIBS} -l${_library_name}")
set(${_library_prefix}_LIBS_STATIC "${${_library_prefix}_LIBS} -l${_library_name}")
set(${_library_prefix}_LIBS_PRIVATE "${${_library_prefix}_LIBS} -l${_library_name}")
endif()
endmacro()
#
# Show the bit width for which we're compiling.
# This can help debug problems if you're dealing with a compiler that
# defaults to generating 32-bit code even when running on a 64-bit
# platform, and where that platform may provide only 64-bit versions of
# libraries that we might use (looking at *you*, Oracle Studio!).
#
if(CMAKE_SIZEOF_VOID_P EQUAL 4)
message(STATUS "Building 32-bit")
elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
message(STATUS "Building 64-bit")
endif()
#
# Solaris pkg-config is annoying. For at least one package (D-Bus, I'm
# looking at *you*!), there are separate include files for 32-bit and
# 64-bit builds (I guess using "unsigned long long" as a 64-bit integer
# type on a 64-bit build is like crossing the beams or something), and
# there are two separate .pc files, so if we're doing a 32-bit build we
# should make sure we look in /usr/lib/pkgconfig for .pc files and if
# we're doing a 64-bit build we should make sure we look in
# /usr/lib/amd64/pkgconfig for .pc files.
#
if(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND CMAKE_SYSTEM_VERSION MATCHES "5[.][0-9.]*")
#
# Note: string(REPLACE) does not appear to support using ENV{...}
# as an argument, so we set a variable and then use set() to set
# the environment variable.
#
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
#
# 64-bit build. If /usr/lib/pkgconfig appears in the path,
# prepend /usr/lib/amd64/pkgconfig to it; otherwise,
# put /usr/lib/amd64 at the end.
#
if((NOT DEFINED ENV{PKG_CONFIG_PATH}) OR "$ENV{PKG_CONFIG_PATH}" EQUAL "")
#
# Not set, or empty. Set it to /usr/lib/amd64/pkgconfig.
#
set(fixed_path "/usr/lib/amd64/pkgconfig")
elseif("$ENV{PKG_CONFIG_PATH}" MATCHES "/usr/lib/pkgconfig")
#
# It contains /usr/lib/pkgconfig. Prepend
# /usr/lib/amd64/pkgconfig to /usr/lib/pkgconfig.
#
string(REPLACE "/usr/lib/pkgconfig"
"/usr/lib/amd64/pkgconfig:/usr/lib/pkgconfig"
fixed_path "$ENV{PKG_CONFIG_PATH}")
else()
#
# Not empty, but doesn't contain /usr/lib/pkgconfig.
# Append /usr/lib/amd64/pkgconfig to it.
#
set(fixed_path "$ENV{PKG_CONFIG_PATH}:/usr/lib/amd64/pkgconfig")
endif()
set(ENV{PKG_CONFIG_PATH} "${fixed_path}")
elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
#
# 32-bit build. If /usr/amd64/lib/pkgconfig appears in the path,
# prepend /usr/lib/pkgconfig to it.
#
if("$ENV{PKG_CONFIG_PATH}" MATCHES "/usr/lib/amd64/pkgconfig")
#
# It contains /usr/lib/amd64/pkgconfig. Prepend
# /usr/lib/pkgconfig to /usr/lib/amd64/pkgconfig.
#
string(REPLACE "/usr/lib/amd64/pkgconfig"
"/usr/lib/pkgconfig:/usr/lib/amd64/pkgconfig"
fixed_path "$ENV{PKG_CONFIG_PATH}")
set(ENV{PKG_CONFIG_PATH} "${fixed_path}")
endif()
endif()
endif()
include(CheckCCompilerFlag)
#
# For checking if a compiler flag works and adding it if it does.
#
macro(check_and_add_compiler_option _option)
message(STATUS "Checking C compiler flag ${_option}")
string(REPLACE "=" "-" _temp_option_variable ${_option})
string(REGEX REPLACE "^-" "" _option_variable ${_temp_option_variable})
check_c_compiler_flag("${_option}" ${_option_variable})
if(${${_option_variable}})
set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} ${_option}")
endif()
endmacro()
#
# If we're building with Visual Studio, we require Visual Studio 2015,
# in order to get sufficient C99 compatibility. Check for that.
#
# If not, try the appropriate flag for the compiler to enable C99
# features.
#
set(C_ADDITIONAL_FLAGS "")
if(MSVC)
if(MSVC_VERSION LESS 1900)
message(FATAL_ERROR "Visual Studio 2015 or later is required")
endif()
#
# Treat source files as being in UTF-8 with MSVC if it's not using
# the Clang front end.
# We assume that UTF-8 source is OK with other compilers and with
# MSVC if it's using the Clang front end.
#
if(NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} /utf-8")
endif(NOT ${CMAKE_C_COMPILER} MATCHES "clang*")
else(MSVC)
#
# For checking if a compiler flag works, failing if it doesn't,
# and adding it otherwise.
#
macro(require_and_add_compiler_option _option)
message(STATUS "Checking C compiler flag ${_option}")
string(REPLACE "=" "-" _temp_option_variable ${_option})
string(REGEX REPLACE "^-" "" _option_variable ${_temp_option_variable})
check_c_compiler_flag("${_option}" ${_option_variable})
if(${${_option_variable}})
set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} ${_option}")
else()
message(FATAL_ERROR "C99 support is required, but the compiler doesn't support a compiler flag to enable it")
endif()
endmacro()
#
# Try to enable as many C99 features as we can.
# At minimum, we want C++/C99-style // comments.
#
# Newer versions of compilers might default to supporting C99, but
# older versions may require a special flag.
#
# Prior to CMake 3.1, setting CMAKE_C_STANDARD will not have any effect,
# so, unless and until we require CMake 3.1 or later, we have to do it
# ourselves on pre-3.1 CMake, so we just do it ourselves on all versions
# of CMake.
#
# Note: with CMake 3.1 through 3.5, the only compilers for which CMake
# handles CMAKE_C_STANDARD are GCC and Clang. 3.6 adds support only
# for Intel C; 3.9 adds support for PGI C, Sun C, and IBM XL C, and
# 3.10 adds support for Cray C and IAR C, but no version of CMake has
# support for HP C. Therefore, even if we use CMAKE_C_STANDARD with
# compilers for which CMake supports it, we may still have to do it
# ourselves on other compilers.
#
# See the CMake documentation for the CMAKE_<LANG>_COMPILER_ID variables
# for a list of compiler IDs.
#
# XXX - this just tests whether the option works, fails if it doesn't,
# and adds it if it does. We don't test whether it's necessary in order
# to get the C99 features that we use, or whether, if it's used, it
# enables all the features that we require.
#
if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR
CMAKE_C_COMPILER_ID MATCHES "Clang")
require_and_add_compiler_option("-std=gnu99")
elseif(CMAKE_C_COMPILER_ID MATCHES "XL")
#
# We want support for extensions picked up for GNU C compatibility,
# so we use -qlanglvl=extc99.
#
require_and_add_compiler_option("-qlanglvl=extc99")
elseif(CMAKE_C_COMPILER_ID MATCHES "HP")
require_and_add_compiler_option("-AC99")
elseif(CMAKE_C_COMPILER_ID MATCHES "Sun")
require_and_add_compiler_option("-xc99")
elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
require_and_add_compiler_option("-c99")
endif()
endif(MSVC)
#
# If we're building with MinGW, we need to specify _WIN32_WINNT as
# 0x0600 ("NT 6.0", a/k/a Vista/Windows Server 2008) or higher
# in order to get the full IPv6 API, including inet_ntop(), and we
# need to specify it as 0x0601 ("NT 6.1", a/k/a Windows 7) or higher
# in order to get NdisMediumIP.
#
# NOTE: pcap does *NOT* work with msvcrt.dll; it must link with
# a newer version of the C library, i.e. Visual Studio 2015 or
# later, as it depends on C99 features introduced in VS 2015.
#
if(MINGW)
add_definitions(-D_WIN32_WINNT=0x0601)
endif(MINGW)
#
# Build all runtimes in the top-level binary directory; that way,
# on Windows, the executables will be in the same directory as
# the DLLs, so the system will find pcap.dll when any of the
# executables are run.
#
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/run)
###################################################################
# Parameters
###################################################################
if(WIN32)
#
# On Windows, allow the library name to be overridden, for the
# benefit of projects that combine libpcap with their own
# kernel-mode code to support capturing.
#
set(LIBRARY_NAME pcap CACHE STRING "Library name")
else()
#
# On UN*X, it's always been libpcap.
#
set(LIBRARY_NAME pcap)
endif()
option(INET6 "Enable IPv6" ON)
if(WIN32)
option(USE_STATIC_RT "Use static Runtime" ON)
endif(WIN32)
option(BUILD_SHARED_LIBS "Build shared libraries" ON)
set(dpdk_ROOT "" CACHE PATH "Path to directory with include and lib subdirectories for DPDK")
if(WIN32)
set(Packet_ROOT "" CACHE PATH "Path to directory with include and lib subdirectories for packet.dll")
endif(WIN32)
option(ENABLE_PROFILING "Enable code profiling" OFF)
# To pacify those who hate the protochain instruction
option(NO_PROTOCHAIN "Disable protochain instruction" OFF)
#
# Start out with the capture mechanism type unspecified; the user
# can explicitly specify it and, if they don't, we'll pick an
# appropriate one.
#
set(PCAP_TYPE "" CACHE STRING "Packet capture type")
#
# Default to having remote capture support on Windows and, for now, to
# not having it on UN*X.
#
if(WIN32)
option(ENABLE_REMOTE "Enable remote capture" ON)
else()
option(ENABLE_REMOTE "Enable remote capture" OFF)
endif(WIN32)
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
option(BUILD_WITH_LIBNL "Build with libnl" ON)
endif()
#
# Additional capture modules.
#
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
option(DISABLE_LINUX_USBMON "Disable Linux usbmon USB sniffing support" OFF)
endif()
option(DISABLE_BLUETOOTH "Disable Bluetooth sniffing support" OFF)
option(DISABLE_NETMAP "Disable netmap support" OFF)
option(DISABLE_DPDK "Disable DPDK support" OFF)
#
# We don't support D-Bus sniffing on macOS; see
#
# https://bugs.freedesktop.org/show_bug.cgi?id=74029
#
if(APPLE)
option(DISABLE_DBUS "Disable D-Bus sniffing support" ON)
else(APPLE)
option(DISABLE_DBUS "Disable D-Bus sniffing support" OFF)
endif(APPLE)
option(DISABLE_RDMA "Disable RDMA sniffing support" OFF)
option(DISABLE_DAG "Disable Endace DAG card support" OFF)
option(ENABLE_DAG_TX "Enable Endace DAG transmit support" OFF)
option(DISABLE_SNF "Disable Myricom SNF support" OFF)
#
# Debugging options.
#
option(BDEBUG "Build optimizer debugging code" OFF)
option(YYDEBUG "Build parser debugging code" OFF)
###################################################################
# Versioning
###################################################################
# Get, parse, format and set pcap's version string from [pcap_root]/VERSION
# for later use.
# Get MAJOR, MINOR, PATCH & SUFFIX
file(STRINGS ${pcap_SOURCE_DIR}/VERSION
PACKAGE_VERSION
LIMIT_COUNT 1 # Read only the first line
)
# Get "just" MAJOR
string(REGEX MATCH "^([0-9]+)" PACKAGE_VERSION_MAJOR "${PACKAGE_VERSION}")
# Get MAJOR, MINOR & PATCH
string(REGEX MATCH "^([0-9]+.)?([0-9]+.)?([0-9]+)" PACKAGE_VERSION_NOSUFFIX "${PACKAGE_VERSION}")
if(WIN32)
# Convert PCAP_VERSION_NOSUFFIX to Windows preferred version format
string(REPLACE "." "," PACKAGE_VERSION_PREDLL ${PACKAGE_VERSION_NOSUFFIX})
# Append NANO (used for Windows internal versioning) to PCAP_VERSION_PREDLL
# 0 means unused.
set(PACKAGE_VERSION_DLL ${PACKAGE_VERSION_PREDLL},0)
endif(WIN32)
set(PACKAGE_NAME "${LIBRARY_NAME}")
set(PACKAGE_STRING "${LIBRARY_NAME} ${PACKAGE_VERSION}")
######################################
# Project settings
######################################
include_directories(
${CMAKE_CURRENT_BINARY_DIR}
${pcap_SOURCE_DIR}
)
include(CheckFunctionExists)
include(CMakePushCheckState)
include(CheckSymbolExists)
if(WIN32)
if(IS_DIRECTORY ${CMAKE_HOME_DIRECTORY}/../../Common)
include_directories(${CMAKE_HOME_DIRECTORY}/../../Common)
endif(IS_DIRECTORY ${CMAKE_HOME_DIRECTORY}/../../Common)
find_package(Packet)
if(Packet_FOUND)
set(HAVE_PACKET32 TRUE)
include_directories(${Packet_INCLUDE_DIRS})
#
# Check whether we have the NPcap PacketIsLoopbackAdapter()
# function.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES ${Packet_LIBRARIES})
check_function_exists(PacketIsLoopbackAdapter HAVE_PACKET_IS_LOOPBACK_ADAPTER)
check_function_exists(PacketGetTimestampModes HAVE_PACKET_GET_TIMESTAMP_MODES)
cmake_pop_check_state()
endif(Packet_FOUND)
message(STATUS "checking for Npcap's version.h")
check_symbol_exists(WINPCAP_PRODUCT_NAME "${CMAKE_SOURCE_DIR}/../../version.h" HAVE_VERSION_H)
if(HAVE_VERSION_H)
message(STATUS "HAVE version.h")
else(HAVE_VERSION_H)
message(STATUS "MISSING version.h")
endif(HAVE_VERSION_H)
endif(WIN32)
if(MSVC)
add_definitions(-D__STDC__)
add_definitions(-D_CRT_SECURE_NO_WARNINGS)
endif(MSVC)
if(USE_STATIC_RT)
message(STATUS "Use STATIC runtime")
if(MSVC)
foreach(RT_FLAG
CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)
string(REGEX REPLACE "/MD" "/MT" ${RT_FLAG} "${${RT_FLAG}}")
endforeach(RT_FLAG)
elseif(MINGW)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static-libgcc")
endif()
else (USE_STATIC_RT)
message(STATUS "Use DYNAMIC runtime")
endif(USE_STATIC_RT)
#
# CMake's definition of "cross-compiling" appears to be "compiling
# for an *operating system* other than the one on which the build
# is being done*.
#
# This is an inadequate definition, as people build for the same
# operating system but a different instruction set, e.g. building
# on an IA-32 or x86-64 Linux box for an Arm embedded Linux box,
# or building Arm code on an IA-32 or x86-64 Windows box.
#
# So just test whether check_c_source_runs() on a trivial program
# works; if not, it's probably because the generated code won't
# run on the platform on which we're running.
#
include(CheckCSourceRuns)
if (NOT CMAKE_CROSSCOMPILING)
check_c_source_runs("
int main()
{
return 0;
}
"
CHECK_C_SOURCE_RUNS_WORKS
)
if (NOT CHECK_C_SOURCE_RUNS_WORKS)
set(CMAKE_CROSSCOMPILING TRUE)
endif()
endif()
###################################################################
# Detect available platform features
###################################################################
include(CheckIncludeFile)
include(CheckIncludeFiles)
include(CheckStructHasMember)
include(CheckTypeSize)
#
# Tests are a bit expensive with Visual Studio on Windows, so, on
# Windows, we skip tests for UN*X-only headers and functions.
#
#
# Header files.
#
check_include_file(unistd.h HAVE_UNISTD_H)
if(NOT HAVE_UNISTD_H)
add_definitions(-DYY_NO_UNISTD_H)
endif(NOT HAVE_UNISTD_H)
if(NOT WIN32)
check_include_file(sys/ioccom.h HAVE_SYS_IOCCOM_H)
check_include_file(sys/sockio.h HAVE_SYS_SOCKIO_H)
check_include_file(sys/select.h HAVE_SYS_SELECT_H)
check_include_file(netpacket/packet.h HAVE_NETPACKET_PACKET_H)
check_include_file(netinet/if_ether.h HAVE_NETINET_IF_ETHER_H)
endif(NOT WIN32)
#
# Functions.
#
# First, check for the __atomic_load_n() and __atomic_store_n()
# builtins.
#
# We can't use check_function_exists(), as it tries to declare
# the function, and attempting to declare a compiler builtin
# can produce an error.
#
# We don't use check_symbol_exists(), as it expects a header
# file to be specified to declare the function, but there isn't
# such a header file.
#
# So we use check_c_source_compiles().
#
check_c_source_compiles(
"int
main(void)
{
int i = 17;
return __atomic_load_n(&i, __ATOMIC_RELAXED);
}
"
HAVE___ATOMIC_LOAD_N)
check_c_source_compiles(
"int
main(void)
{
int i;
__atomic_store_n(&i, 17, __ATOMIC_RELAXED);
return 0;
}
"
HAVE___ATOMIC_STORE_N)
#
# Now check for various system functions.
#
check_function_exists(strerror_r HAVE_STRERROR_R)
if(HAVE_STRERROR_R)
#
# We have strerror_r; if we define _GNU_SOURCE, is it a
# POSIX-compliant strerror_r() or a GNU strerror_r()?
#
check_c_source_compiles(
"#define _GNU_SOURCE
#include <string.h>
/* Define it GNU-style; that will cause an error if it's not GNU-style */
extern char *strerror_r(int, char *, size_t);
int
main(void)
{
return 0;
}
"
HAVE_GNU_STRERROR_R)
if(NOT HAVE_GNU_STRERROR_R)
set(HAVE_POSIX_STRERROR_R YES)
endif(NOT HAVE_GNU_STRERROR_R)
else(HAVE_STRERROR_R)
#
# We don't have strerror_r; do we have _wcserror_s?
#
check_function_exists(_wcserror_s HAVE__WCSERROR_S)
endif(HAVE_STRERROR_R)
if (NOT CMAKE_CROSSCOMPILING)
#
# Require a proof of suitable snprintf(3), same as in Autoconf.
#
check_c_source_runs("
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#if defined(_WIN32) && !defined(_SSIZE_T_DEFINED)
/*
* On UN*Xes, this is a signed integer type of the same size as size_t.
*
* It's not defined by Visual Studio; we assume that ptrdiff_t will
* be a type that is a signed integer type of the same size as size_t.
*/
typedef ptrdiff_t ssize_t;
#endif
/*
* Avoid trying to cast negative values to unsigned types, or doing
* shifts of signed types, in order not to have the test program fail
* if we're building with undefined-behavior sanitizers enabled.
*/
int main()
{
char buf[100];
unsigned int ui = sizeof(buf);
int i = sizeof(buf);
int64_t i64 = INT64_C(0x100000000);
uint64_t ui64 = UINT64_C(0x100000000);
snprintf(buf, sizeof(buf), \"%zu\", (size_t)ui);
if (strncmp(buf, \"100\", sizeof(buf)))
return 1;
snprintf(buf, sizeof(buf), \"%zd\", (ssize_t)(-i));
if (strncmp(buf, \"-100\", sizeof(buf)))
return 2;
snprintf(buf, sizeof(buf), \"%\" PRId64, -i64);
if (strncmp(buf, \"-4294967296\", sizeof(buf)))
return 3;
snprintf(buf, sizeof(buf), \"0o%\" PRIo64, ui64);
if (strncmp(buf, \"0o40000000000\", sizeof(buf)))
return 4;
snprintf(buf, sizeof(buf), \"0x%\" PRIx64, ui64);
if (strncmp(buf, \"0x100000000\", sizeof(buf)))
return 5;
snprintf(buf, sizeof(buf), \"%\" PRIu64, ui64);
if (strncmp(buf, \"4294967296\", sizeof(buf)))
return 6;
return 0;
}
"
SUITABLE_SNPRINTF
)
if(NOT SUITABLE_SNPRINTF)
message(FATAL_ERROR
"The snprintf(3) implementation in this libc is not suitable,
libpcap would not work correctly even if it managed to compile."
)
endif()
else()
message(STATUS "Skipped SUITABLE_SNPRINTF because cross-compiling.")
endif()
check_function_exists(strlcpy HAVE_STRLCPY)
check_function_exists(strlcat HAVE_STRLCAT)
check_function_exists(asprintf HAVE_ASPRINTF)
check_function_exists(vasprintf HAVE_VASPRINTF)
check_function_exists(strtok_r HAVE_STRTOK_R)
if(NOT WIN32)
check_function_exists(vsyslog HAVE_VSYSLOG)
endif()
#
# Look for various networking-related libraries that we may need.
#
# We need getaddrinfo() to translate host names in filters to IP
# addresses. We use getaddrinfo() because we want a portable
# thread-safe way of getting information for a host name or port;
# there exist _r versions of gethostbyname() and getservbyname() on
# some platforms, but not on all platforms.
#
# We may also need socket() and other socket functions to support:
#
# Local packet capture with capture mechanisms that use sockets.
#
# Local capture device enumeration if a socket call is needed to
# enumerate devices or get device attributes.
#
# Packet capture from services that put captured packets on the
# network, such as rpcap servers.
#
# We may also need getnameinfo() for packet capture from services
# that put packets on the network.
#
set(PCAP_LINK_LIBRARIES "")
set(LIBS "")
set(LIBS_STATIC "")
set(REQUIRES_PRIVATE "")
set(LIBS_PRIVATE "")
include(CheckLibraryExists)
if(WIN32)
#
# Windows.
#
# We need winsock2.h and ws2tcpip.h.
#
# On Windows, getaddrinfo() is in the ws2_32 library.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES ws2_32)
check_symbol_exists(getaddrinfo "winsock2.h;ws2tcpip.h" LIBWS2_32_HAS_GETADDRINFO)
cmake_pop_check_state()
if(LIBWS2_32_HAS_GETADDRINFO)
set(PCAP_LINK_LIBRARIES ws2_32 ${PCAP_LINK_LIBRARIES})
else(LIBWS2_32_HAS_GETADDRINFO)
message(FATAL_ERROR "getaddrinfo is required, but wasn't found")
endif(LIBWS2_32_HAS_GETADDRINFO)
else(WIN32)
#
# UN*X.
#
# Most UN*Xes have getaddrinfo(), and the other routines we may
# need, in the default searched libraries (e.g., libc).
# Check there first.
#
# NOTE: if you hand check_library_exists as its last argument a
# variable that's been set, it skips the test, so we need different
# variables for different libraries.
#
check_function_exists(getaddrinfo STDLIBS_HAVE_GETADDRINFO)
if(NOT STDLIBS_HAVE_GETADDRINFO)
#
# Not found in the standard system libraries.
#
# In some versions of Solaris, we need to link with libsocket
# and libnsl, so check in libsocket and also link with liblnsl
# when doing this test.
#
# Linking with libsocket and libnsl will find all the routines
# we need.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES nsl)
check_library_exists(socket getaddrinfo "" LIBSOCKET_HAS_GETADDRINFO)
cmake_pop_check_state()
if(LIBSOCKET_HAS_GETADDRINFO)
#
# OK, we found it in libsocket.
#
set(PCAP_LINK_LIBRARIES socket nsl ${PCAP_LINK_LIBRARIES})
set(LIBS "-lsocket -lnsl ${LIBS}")
set(LIBS_STATIC "-lsocket -lnsl ${LIBS_STATIC}")
set(LIBS_PRIVATE "-lsocket -lnsl ${LIBS_PRIVATE}")
else(LIBSOCKET_HAS_GETADDRINFO)
#
# Not found in libsocket; test for it in libnetwork, which
# is where it is in Haiku.
#
# Linking with libnetwork will find all the routines we
# need.
#
check_library_exists(network getaddrinfo "" LIBNETWORK_HAS_GETADDRINFO)
if(LIBNETWORK_HAS_GETADDRINFO)
#
# OK, we found it in libnetwork.
#
set(PCAP_LINK_LIBRARIES network ${PCAP_LINK_LIBRARIES})
set(LIBS "-lnetwork ${LIBS}")
set(LIBS_STATIC "-lnetwork ${LIBS_STATIC}")
set(LIBS_PRIVATE "-lnetwork ${LIBS_PRIVATE}")
else(LIBNETWORK_HAS_GETADDRINFO)
#
# We didn't find it.
#
message(FATAL_ERROR "getaddrinfo is required, but wasn't found")
endif(LIBNETWORK_HAS_GETADDRINFO)
endif(LIBSOCKET_HAS_GETADDRINFO)
#
# We require a version of recvmsg() that conforms to the Single
# UNIX Specification, so that we can check whether a datagram
# received with recvmsg() was truncated when received due to the
# buffer being too small.
#
# On most systems, the version of recvmsg() in the libraries
# found above conforms to the SUS.
#
# On at least some versions of Solaris, it does not conform to
# the SUS, and we need the version in libxnet, which does
# conform.
#
# Check whether libxnet exists and has a version of recvmsg();
# if it does, link with libxnet before we link with libsocket,
# to get that version.
#
# This test also links with libsocket and libnsl.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES socket nsl)
check_library_exists(xnet recvmsg "" LIBXNET_HAS_RECVMSG)
cmake_pop_check_state()
if(LIBXNET_HAS_RECVMSG)
#
# libxnet has recvmsg(); link with it as well.
#
set(PCAP_LINK_LIBRARIES xnet ${PCAP_LINK_LIBRARIES})
set(LIBSC "-lxnet ${LIBS_LIBS}")
set(LIBS_STATIC "-lxnet ${LIBS_STATIC}")
set(LIBS_PRIVATE "-lxnet ${LIBS_PRIVATE}")
endif(LIBXNET_HAS_RECVMSG)
endif(NOT STDLIBS_HAVE_GETADDRINFO)
#
# DLPI needs putmsg under HP-UX, so test for -lstr while we're at it.
#
check_function_exists(putmsg STDLIBS_HAVE_PUTMSG)
if(NOT STDLIBS_HAVE_PUTMSG)
check_library_exists(str putmsg "" LIBSTR_HAS_PUTMSG)
if(LIBSTR_HAS_PUTMSG)
set(PCAP_LINK_LIBRARIES str ${PCAP_LINK_LIBRARIES})
set(LIBS "-lstr ${LIBS}")
set(LIBS_STATIC "-lstr ${LIBS_STATIC}")