ConfigureChecks.cmake

# ConfigureChecks.cmake
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 1998 Gerald Combs
#
# SPDX-License-Identifier: GPL-2.0-or-later
#

include(CMakePushCheckState)

#check system for includes
include(CheckIncludeFile)
include(CheckIncludeFiles)
check_include_file("arpa/inet.h"            HAVE_ARPA_INET_H)
check_include_file("fcntl.h"                HAVE_FCNTL_H)
check_include_file("getopt.h"               HAVE_GETOPT_H)
check_include_file("grp.h"                  HAVE_GRP_H)
#
# This may require <sys/types.h> to be included
#
check_include_files("sys/types.h;ifaddrs.h" HAVE_IFADDRS_H)
check_include_file("netinet/in.h"           HAVE_NETINET_IN_H)
check_include_file("netdb.h"                HAVE_NETDB_H)
check_include_file("pwd.h"                  HAVE_PWD_H)
check_include_file("sys/ioctl.h"            HAVE_SYS_IOCTL_H)
check_include_file("sys/select.h"           HAVE_SYS_SELECT_H)
check_include_file("sys/socket.h"           HAVE_SYS_SOCKET_H)
check_include_file("sys/sockio.h"           HAVE_SYS_SOCKIO_H)
check_include_file("sys/time.h"             HAVE_SYS_TIME_H)
check_include_file("sys/utsname.h"          HAVE_SYS_UTSNAME_H)
check_include_file("sys/wait.h"             HAVE_SYS_WAIT_H)
check_include_file("unistd.h"               HAVE_UNISTD_H)

#
# On Linux, check for some additional headers, which we need as a
# workaround for a bonding driver bug and for libpcap's current lack
# of its own workaround for that bug.
#
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	#
	# Those header files require <sys/socket.h>.
	#
	check_c_source_compiles(
		"#include <sys/socket.h>
		#include <linux/sockios.h>
		int main(void)
		{
			return 0;
		}"
		HAVE_LINUX_SOCKIOS_H
	)
	check_c_source_compiles(
		"#include <sys/socket.h>
		#include <linux/if_bonding.h>
		int main(void)
		{
			return 0;
		}"
		HAVE_LINUX_IF_BONDING_H
	)
endif()

#Functions
include(CheckFunctionExists)
include(CheckSymbolExists)

#
# Platform-specific functions used in platform-specific code.
# We check for them only on the platform on which we use them.
#
if(CMAKE_SYSTEM_NAME STREQUAL "HP-UX")
	#
	# HP-UX
	#
	cmake_push_check_state()
	set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_DL_LIBS})
	check_function_exists("dlget"           HAVE_DLGET)
	cmake_pop_check_state()
elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND CMAKE_SYSTEM_VERSION MATCHES "5[.][0-9.]*")
	#
	# Solaris
	#
	check_function_exists("getexecname"     HAVE_GETEXECNAME)
endif()

#
# Use check_symbol_exists just in case math.h does something magic
# and there's not actually a function named floorl()
#
cmake_push_check_state()
set(CMAKE_REQUIRED_INCLUDES ${M_INCLUDE_DIRS})
set(CMAKE_REQUIRED_LIBRARIES ${M_LIBRARIES})
check_symbol_exists("floorl" "math.h"    HAVE_FLOORL)
cmake_pop_check_state()

#
# Check whether we have clock_gettime().
# It's not on Windows, so don't waste time checking for it.
# It's in newer POSIX, so some, but not all, UN*Xes have it.
#
if (NOT WIN32)
	#
	# POSIX - don't bother checking on Windows, as checks
	# take time.
	#
	check_function_exists("clock_gettime"    HAVE_CLOCK_GETTIME)
endif (NOT WIN32)

check_function_exists("getopt_long"      HAVE_GETOPT_LONG)
if(HAVE_GETOPT_LONG)
	#
	# The OS has getopt_long(), so it might have optreset.
	# Do we have it?
	#
	if(HAVE_GETOPT_H)
		check_symbol_exists("optreset" "getopt.h" HAVE_OPTRESET)
	else()
		check_symbol_exists("optreset"           HAVE_OPTRESET)
	endif()
else()
	#
	# The OS doesn't have getopt_long(), so we're using the GNU libc
	# version that we have in wsutil.  It doesn't have optreset, so we
	# don't need to check for it.
	#
	# However, it uses alloca(), so we may need to include alloca.h;
	# check for it.
	#
	check_include_file("alloca.h"    HAVE_ALLOCA_H)
endif()
check_function_exists("getifaddrs"       HAVE_GETIFADDRS)
check_function_exists("issetugid"        HAVE_ISSETUGID)
check_function_exists("mkstemps"         HAVE_MKSTEMPS)
check_function_exists("setresgid"        HAVE_SETRESGID)
check_function_exists("setresuid"        HAVE_SETRESUID)
check_function_exists("strptime"         HAVE_STRPTIME)
if (APPLE)
	cmake_push_check_state()
	set(CMAKE_REQUIRED_LIBRARIES ${APPLE_CORE_FOUNDATION_LIBRARY})
	check_function_exists("CFPropertyListCreateWithStream" HAVE_CFPROPERTYLISTCREATEWITHSTREAM)
	cmake_pop_check_state()
endif()

#Struct members
include(CheckStructHasMember)
check_struct_has_member("struct sockaddr" sa_len         sys/socket.h HAVE_STRUCT_SOCKADDR_SA_LEN)
check_struct_has_member("struct stat"     st_flags       sys/stat.h   HAVE_STRUCT_STAT_ST_FLAGS)
check_struct_has_member("struct stat"     st_blksize     sys/stat.h   HAVE_STRUCT_STAT_ST_BLKSIZE)
check_struct_has_member("struct stat"     st_birthtime   sys/stat.h   HAVE_STRUCT_STAT_ST_BIRTHTIME)
check_struct_has_member("struct stat"     __st_birthtime sys/stat.h   HAVE_STRUCT_STAT___ST_BIRTHTIME)
check_struct_has_member("struct tm"       tm_zone        time.h       HAVE_STRUCT_TM_TM_ZONE)

#Symbols but NOT enums or types
check_symbol_exists(tzname "time.h" HAVE_TZNAME)

# Check for stuff that isn't testable via the tests above

#
# *If* we found libnl, check if we can use nl80211 stuff with it.
#
if (NL_FOUND)
	check_c_source_compiles(
		"#include <linux/nl80211.h>
		int main(void) {
			int x = NL80211_FREQUENCY_ATTR_MAX_TX_POWER;
			x |= NL80211_ATTR_SUPPORTED_IFTYPES;
			x |= NL80211_ATTR_SUPPORTED_COMMANDS;
			x |= NL80211_ATTR_WIPHY_FREQ;
			x |= NL80211_CHAN_NO_HT;
			(void)x;
		}"
		HAVE_NL80211
	)
	check_c_source_compiles(
		"#include <linux/nl80211.h>
		int main(void) {
			enum nl80211_commands x = NL80211_CMD_SET_CHANNEL;
		}"
		HAVE_NL80211_CMD_SET_CHANNEL
	)
	check_c_source_compiles(
		"#include <linux/nl80211.h>
		int main(void) {
			enum nl80211_protocol_features x = NL80211_PROTOCOL_FEATURE_SPLIT_WIPHY_DUMP;
		}"
		HAVE_NL80211_SPLIT_WIPHY_DUMP
	)
	check_c_source_compiles(
		"#include <linux/nl80211.h>
		int main(void) {
			enum nl80211_attrs x = NL80211_ATTR_VHT_CAPABILITY;
		}"
		HAVE_NL80211_VHT_CAPABILITY
	)
endif()

#
# Editor modelines  -  https://www.wireshark.org/tools/modelines.html
#
# Local variables:
# c-basic-offset: 8
# tab-width: 8
# indent-tabs-mode: t
# End:
#
# vi: set shiftwidth=8 tabstop=8 noexpandtab:
# :indentSize=8:tabSize=8:noTabs=false:
#