Merging upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 974 insertions, 0 deletions

diff --git a/fluent-bit/lib/c-ares-1.19.1/configure.ac b/fluent-bit/lib/c-ares-1.19.1/configure.ac
new file mode 100644
index 000000000..54e79d6e2
--- /dev/null
+++ b/fluent-bit/lib/c-ares-1.19.1/configure.ac
@@ -0,0 +1,974 @@
+AC_PREREQ([2.60])
+
+AC_INIT([c-ares], [1.19.1],
+  [c-ares mailing list: http://lists.haxx.se/listinfo/c-ares])
+
+CARES_VERSION_INFO="8:1:6"
+dnl This flag accepts an argument of the form current[:revision[:age]]. So,
+dnl passing -version-info 3:12:1 sets current to 3, revision to 12, and age to
+dnl 1.
+dnl
+dnl If either revision or age are omitted, they default to 0. Also note that age
+dnl must be less than or equal to the current interface number.
+dnl
+dnl Here are a set of rules to help you update your library version information:
+dnl
+dnl 1.Start with version information of 0:0:0 for each libtool library.
+dnl
+dnl 2.Update the version information only immediately before a public release of
+dnl your software. More frequent updates are unnecessary, and only guarantee
+dnl that the current interface number gets larger faster.
+dnl
+dnl 3.If the library source code has changed at all since the last update, then
+dnl increment revision (c:r+1:a)
+dnl
+dnl 4.If any interfaces have been added, removed, or changed since the last
+dnl update, increment current, and set revision to 0. (c+1:r=0:a)
+dnl
+dnl 5.If any interfaces have been added since the last public release, then
+dnl increment age. (c:r:a+1)
+dnl
+dnl 6.If any interfaces have been removed since the last public release, then
+dnl set age to 0. (c:r:a=0)
+dnl
+AC_SUBST([CARES_VERSION_INFO])
+
+AC_CONFIG_SRCDIR([src/lib/ares_ipv6.h])
+AC_CONFIG_HEADERS([src/lib/ares_config.h include/ares_build.h])
+AC_CONFIG_MACRO_DIR([m4])
+AM_MAINTAINER_MODE
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX_11])
+
+CARES_CHECK_OPTION_DEBUG
+CARES_CHECK_OPTION_OPTIMIZE
+CARES_CHECK_OPTION_WARNINGS
+CARES_CHECK_OPTION_WERROR
+CARES_CHECK_OPTION_SYMBOL_HIDING
+CARES_CHECK_OPTION_EXPOSE_STATICS
+
+XC_CHECK_PATH_SEPARATOR
+
+dnl SED is mandatory for configure process and libtool.
+dnl Set it now, allowing it to be changed later.
+AC_PATH_PROG([SED], [sed], [not_found],
+  [$PATH:/usr/bin:/usr/local/bin])
+if test -z "$SED" || test "$SED" = "not_found"; then
+  AC_MSG_ERROR([sed not found in PATH. Cannot continue without sed.])
+fi
+AC_SUBST([SED])
+
+dnl GREP is mandatory for configure process and libtool.
+dnl Set it now, allowing it to be changed later.
+AC_PATH_PROG([GREP], [grep], [not_found],
+  [$PATH:/usr/bin:/usr/local/bin])
+if test -z "$GREP" || test "$GREP" = "not_found"; then
+  AC_MSG_ERROR([grep not found in PATH. Cannot continue without grep.])
+fi
+AC_SUBST([GREP])
+
+dnl EGREP is mandatory for configure process and libtool.
+dnl Set it now, allowing it to be changed later.
+if echo a | ($GREP -E '(a|b)') >/dev/null 2>&1; then
+  AC_MSG_CHECKING([for egrep])
+  EGREP="$GREP -E"
+  AC_MSG_RESULT([$EGREP])
+else
+  AC_PATH_PROG([EGREP], [egrep], [not_found],
+    [$PATH:/usr/bin:/usr/local/bin])
+fi
+if test -z "$EGREP" || test "$EGREP" = "not_found"; then
+  AC_MSG_ERROR([egrep not found in PATH. Cannot continue without egrep.])
+fi
+AC_SUBST([EGREP])
+
+dnl AR is mandatory for configure process and libtool.
+dnl This is target dependent, so check it as a tool.
+if test -z "$AR"; then
+  dnl allow it to be overridden
+  AC_PATH_TOOL([AR], [ar], [not_found],
+    [$PATH:/usr/bin:/usr/local/bin])
+  if test -z "$AR" || test "$AR" = "not_found"; then
+    AC_MSG_ERROR([ar not found in PATH. Cannot continue without ar.])
+  fi
+fi
+AC_SUBST([AR])
+
+AX_CODE_COVERAGE
+
+
+dnl
+dnl Detect the canonical host and target build environment
+dnl
+
+AC_CANONICAL_HOST
+dnl Get system canonical name
+AC_DEFINE_UNQUOTED(OS, "${host}", [cpu-machine-OS])
+
+XC_CHECK_PROG_CC
+AX_CXX_COMPILE_STDCXX_11([noext],[optional])
+
+XC_AUTOMAKE
+
+dnl This defines _ALL_SOURCE for AIX
+CARES_CHECK_AIX_ALL_SOURCE
+
+dnl Our configure and build reentrant settings
+CARES_CONFIGURE_THREAD_SAFE
+CARES_CONFIGURE_REENTRANT
+
+dnl check for how to do large files
+AC_SYS_LARGEFILE
+
+case $host_os in
+  solaris*)
+    AC_DEFINE(ETC_INET, 1, [if a /etc/inet dir is being used])
+    ;;
+esac
+
+XC_LIBTOOL
+
+
+#
+# Automake conditionals based on libtool related checks
+#
+
+AM_CONDITIONAL([CARES_LT_SHLIB_USE_VERSION_INFO],
+  [test "x$xc_lt_shlib_use_version_info" = 'xyes'])
+AM_CONDITIONAL([CARES_LT_SHLIB_USE_NO_UNDEFINED],
+  [test "x$xc_lt_shlib_use_no_undefined" = 'xyes'])
+AM_CONDITIONAL([CARES_LT_SHLIB_USE_MIMPURE_TEXT],
+  [test "x$xc_lt_shlib_use_mimpure_text" = 'xyes'])
+
+#
+# Due to libtool and automake machinery limitations of not allowing
+# specifying separate CPPFLAGS or CFLAGS when compiling objects for
+# inclusion of these in shared or static libraries, we are forced to
+# build using separate configure runs for shared and static libraries
+# on systems where different CPPFLAGS or CFLAGS are mandatory in order
+# to compile objects for each kind of library. Notice that relying on
+# the '-DPIC' CFLAG that libtool provides is not valid given that the
+# user might for example choose to build static libraries with PIC.
+#
+
+#
+# Make our Makefile.am files use the staticlib CPPFLAG only when strictly
+# targeting a static library and not building its shared counterpart.
+#
+
+AM_CONDITIONAL([USE_CPPFLAG_CARES_STATICLIB],
+  [test "x$xc_lt_build_static_only" = 'xyes'])
+
+#
+# Make staticlib CPPFLAG variable and its definition visible in output
+# files unconditionally, providing an empty definition unless strictly
+# targeting a static library and not building its shared counterpart.
+#
+
+CPPFLAG_CARES_STATICLIB=
+if test "x$xc_lt_build_static_only" = 'xyes'; then
+  CPPFLAG_CARES_STATICLIB='-DCARES_STATICLIB'
+fi
+AC_SUBST([CPPFLAG_CARES_STATICLIB])
+
+dnl **********************************************************************
+dnl platform/compiler/architecture specific checks/flags
+dnl **********************************************************************
+
+CARES_CHECK_COMPILER
+CARES_SET_COMPILER_BASIC_OPTS
+CARES_SET_COMPILER_DEBUG_OPTS
+CARES_SET_COMPILER_OPTIMIZE_OPTS
+CARES_SET_COMPILER_WARNING_OPTS
+
+if test "$compiler_id" = "INTEL_UNIX_C"; then
+  #
+  if test "$compiler_num" -ge "1000"; then
+    dnl icc 10.X or later
+    CFLAGS="$CFLAGS -shared-intel"
+  elif test "$compiler_num" -ge "900"; then
+    dnl icc 9.X specific
+    CFLAGS="$CFLAGS -i-dynamic"
+  fi
+  #
+fi
+
+CARES_CHECK_COMPILER_HALT_ON_ERROR
+CARES_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
+CARES_CHECK_COMPILER_PROTOTYPE_MISMATCH
+CARES_CHECK_COMPILER_SYMBOL_HIDING
+
+dnl **********************************************************************
+dnl Compilation based checks should not be done before this point.
+dnl **********************************************************************
+
+dnl **********************************************************************
+dnl Make sure that our checks for headers windows.h winsock.h winsock2.h
+dnl and ws2tcpip.h take precedence over any other further checks which
+dnl could be done later using AC_CHECK_HEADER or AC_CHECK_HEADERS for
+dnl this specific header files. And do them before its results are used.
+dnl **********************************************************************
+
+CURL_CHECK_HEADER_WINDOWS
+CURL_CHECK_NATIVE_WINDOWS
+case X-"$ac_cv_native_windows" in
+  X-yes)
+    CURL_CHECK_HEADER_WINSOCK
+    CURL_CHECK_HEADER_WINSOCK2
+    CURL_CHECK_HEADER_WS2TCPIP
+    CPPFLAGS="$CPPFLAGS -D_WIN32_WINNT=0x0600"
+    ;;
+  *)
+    ac_cv_header_winsock_h="no"
+    ac_cv_header_winsock2_h="no"
+    ac_cv_header_ws2tcpip_h="no"
+    ;;
+esac
+
+dnl **********************************************************************
+dnl Checks for libraries.
+dnl **********************************************************************
+
+CARES_CHECK_LIB_XNET
+
+dnl gethostbyname without lib or in the nsl lib?
+AC_CHECK_FUNC(gethostbyname,
+              [HAVE_GETHOSTBYNAME="1"
+              ],
+              [ AC_CHECK_LIB(nsl, gethostbyname,
+                             [HAVE_GETHOSTBYNAME="1"
+                             LIBS="$LIBS -lnsl"
+                             ])
+              ])
+
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  dnl gethostbyname in the socket lib?
+  AC_CHECK_LIB(socket, gethostbyname,
+               [HAVE_GETHOSTBYNAME="1"
+               LIBS="$LIBS -lsocket"
+               ])
+fi
+
+dnl At least one system has been identified to require BOTH nsl and socket
+dnl libs at the same time to link properly.
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  AC_MSG_CHECKING([for gethostbyname with both nsl and socket libs])
+  my_ac_save_LIBS=$LIBS
+  LIBS="-lnsl -lsocket $LIBS"
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+      gethostbyname();
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    HAVE_GETHOSTBYNAME="1"
+  ],[
+    AC_MSG_RESULT([no])
+    LIBS=$my_ac_save_LIBS
+  ])
+fi
+
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  dnl This is for winsock systems
+  if test "$ac_cv_header_windows_h" = "yes"; then
+    if test "$ac_cv_header_winsock_h" = "yes"; then
+      case $host in
+        *-*-mingw32ce*)
+          winsock_LIB="-lwinsock"
+          ;;
+        *)
+          winsock_LIB="-lwsock32"
+          ;;
+      esac
+    fi
+    if test "$ac_cv_header_winsock2_h" = "yes"; then
+      winsock_LIB="-lws2_32"
+    fi
+    if test ! -z "$winsock_LIB"; then
+      my_ac_save_LIBS=$LIBS
+      LIBS="$winsock_LIB $LIBS"
+      AC_MSG_CHECKING([for gethostbyname in $winsock_LIB])
+      AC_LINK_IFELSE([
+        AC_LANG_PROGRAM([[
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#else
+#ifdef HAVE_WINSOCK_H
+#include <winsock.h>
+#endif
+#endif
+#endif
+        ]],[[
+          gethostbyname("www.dummysite.com");
+        ]])
+      ],[
+        AC_MSG_RESULT([yes])
+        HAVE_GETHOSTBYNAME="1"
+      ],[
+        AC_MSG_RESULT([no])
+        winsock_LIB=""
+        LIBS=$my_ac_save_LIBS
+      ])
+    fi
+  fi
+fi
+
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  dnl This is for Minix 3.1
+  AC_MSG_CHECKING([for gethostbyname for Minix 3])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+/* Older Minix versions may need <net/gen/netdb.h> here instead */
+#include <netdb.h>
+    ]],[[
+      gethostbyname("www.dummysite.com");
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    HAVE_GETHOSTBYNAME="1"
+  ],[
+    AC_MSG_RESULT([no])
+  ])
+fi
+
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  dnl This is for eCos with a stubbed DNS implementation
+  AC_MSG_CHECKING([for gethostbyname for eCos])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+#include <stdio.h>
+#include <netdb.h>
+    ]],[[
+      gethostbyname("www.dummysite.com");
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    HAVE_GETHOSTBYNAME="1"
+  ],[
+    AC_MSG_RESULT([no])
+  ])
+fi
+
+if test "$HAVE_GETHOSTBYNAME" != "1"
+then
+  dnl gethostbyname in the net lib - for BeOS
+  AC_CHECK_LIB(net, gethostbyname,
+               [HAVE_GETHOSTBYNAME="1"
+               LIBS="$LIBS -lnet"
+               ])
+fi
+
+
+if test "$HAVE_GETHOSTBYNAME" != "1"; then
+  AC_MSG_ERROR([couldn't find libraries for gethostbyname()])
+fi
+
+dnl resolv lib for Apple (MacOS and iOS)
+AS_IF([test "x$host_vendor" = "xapple"], [
+  AC_SEARCH_LIBS([res_servicename], [resolv], [
+    AC_DEFINE([CARES_USE_LIBRESOLV], [1], [Use resolver library to configure cares])
+  ], [
+    AC_MSG_ERROR([Unable to find libresolv which is required for iPhone targets])
+  ])
+])
+
+dnl resolv lib for z/OS
+AS_IF([test "x$host_vendor" = "xibm" -a "x$host_os" = "xopenedition" ], [
+  AC_SEARCH_LIBS([res_init], [resolv], [
+    AC_DEFINE([CARES_USE_LIBRESOLV], [1], [Use resolver library to configure cares])
+  ], [
+    AC_MSG_ERROR([Unable to find libresolv which is required for z/OS])
+  ])
+])
+
+dnl resolve lib?
+AC_CHECK_FUNC(strcasecmp, , [ AC_CHECK_LIB(resolve, strcasecmp) ])
+
+if test "$ac_cv_lib_resolve_strcasecmp" = "$ac_cv_func_strcasecmp"; then
+  AC_CHECK_LIB(resolve, strcasecmp,
+              [LIBS="-lresolve $LIBS"],
+               ,
+               -lnsl)
+fi
+ac_cv_func_strcasecmp="no"
+
+dnl Windows builds require linking to iphlpapi
+if test "$ac_cv_header_winsock2_h" = "yes"; then
+  LIBS="$LIBS -liphlpapi"
+fi
+
+CARES_CHECK_LIBS_CONNECT
+
+dnl iOS 10?
+AS_IF([test "x$host_vendor" = "xapple"], [
+  AC_MSG_CHECKING([for iOS minimum version 10 or later])
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+#include <stdio.h>
+#include <TargetConditionals.h>
+    ]], [[
+#if TARGET_OS_IPHONE == 0 || __IPHONE_OS_VERSION_MIN_REQUIRED < 100000
+#error Not iOS 10 or later
+#endif
+return 0;
+   ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    ac_cv_ios_10="yes"
+  ],[
+    AC_MSG_RESULT([no])
+  ])
+])
+
+dnl macOS 10.12?
+AS_IF([test "x$host_vendor" = "xapple"], [
+  AC_MSG_CHECKING([for macOS minimum version 10.12 or later])
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+#include <stdio.h>
+#include <TargetConditionals.h>
+    ]], [[
+#ifndef MAC_OS_X_VERSION_10_12
+#  define MAC_OS_X_VERSION_10_12 101200
+#endif
+#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
+#error Not macOS 10.12 or later
+#endif
+return 0;
+   ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    ac_cv_macos_10_12="yes"
+  ],[
+    AC_MSG_RESULT([no])
+  ])
+])
+
+dnl **********************************************************************
+dnl In case that function clock_gettime with monotonic timer is available,
+dnl check for additional required libraries.
+dnl **********************************************************************
+dnl Xcode 8 bug: iOS when targeting less than 10, or macOS when targeting less than 10.12 will
+dnl say clock_gettime exists, it is a weak symbol that only exists in iOS 10 or macOS 10.12 and will
+dnl cause a crash at runtime when running on older versions.  Skip finding CLOCK_MONOTONIC on older
+dnl Apple OS's.
+if test "x$host_vendor" != "xapple" || test "x$ac_cv_ios_10" = "xyes" || test "x$ac_cv_macos_10_12" = "xyes"; then
+  CURL_CHECK_LIBS_CLOCK_GETTIME_MONOTONIC
+fi
+
+AC_MSG_CHECKING([whether to use libgcc])
+AC_ARG_ENABLE(libgcc,
+AS_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
+[ case "$enableval" in
+  yes)
+        LIBS="$LIBS -lgcc"
+       AC_MSG_RESULT(yes)
+       ;;
+  *)   AC_MSG_RESULT(no)
+       ;;
+  esac ],
+       AC_MSG_RESULT(no)
+)
+
+
+dnl Let's hope this split URL remains working:
+dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \
+dnl genprogc/thread_quick_ref.htm
+
+
+dnl **********************************************************************
+dnl Back to "normal" configuring
+dnl **********************************************************************
+
+dnl Checks for header files.
+AC_HEADER_STDC
+
+AC_PROG_EGREP
+
+
+CURL_CHECK_HEADER_MALLOC
+CURL_CHECK_HEADER_MEMORY
+
+dnl check for a few basic system headers we need
+AC_CHECK_HEADERS(
+       sys/types.h \
+       sys/time.h \
+       sys/select.h \
+       sys/socket.h \
+       sys/ioctl.h \
+       sys/param.h \
+       sys/uio.h \
+       assert.h \
+       netdb.h \
+       netinet/in.h \
+       netinet/tcp.h \
+       net/if.h \
+       errno.h \
+       socket.h \
+       strings.h \
+       stdbool.h \
+       time.h \
+       limits.h \
+       arpa/nameser.h \
+       arpa/nameser_compat.h \
+       arpa/inet.h,
+dnl to do if not found
+[],
+dnl to do if found
+[],
+dnl default includes
+[
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+dnl We do this default-include simply to make sure that the nameser_compat.h
+dnl header *REALLY* can be include after the new nameser.h. It seems AIX 5.1
+dnl (and others?) is not designed to allow this.
+#ifdef HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif
+
+dnl *Sigh* these are needed in order for net/if.h to get properly detected.
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+]
+)
+
+dnl Test and set CARES_HAVE_ARPA_NAMESER_H / CARES_HAVE_ARPA_NAMESER_COMPAT_H
+AC_CHECK_DECL([HAVE_ARPA_NAMESER_H],
+[
+CARES_DEFINE_UNQUOTED([CARES_HAVE_ARPA_NAMESER_H])
+],
+[]
+)
+AC_CHECK_DECL([HAVE_ARPA_NAMESER_COMPAT_H],
+[
+CARES_DEFINE_UNQUOTED([CARES_HAVE_ARPA_NAMESER_COMPAT_H])
+],
+[]
+)
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_TYPE_SIZE_T
+m4_warn([obsolete],
+[Update your code to rely only on HAVE_SYS_TIME_H,
+then remove this warning and the obsolete code below it.
+All current systems provide time.h; it need not be checked for.
+Not all systems provide sys/time.h, but those that do, all allow
+you to include it and time.h simultaneously.])dnl
+AC_CHECK_HEADERS_ONCE([sys/time.h])
+# Obsolete code to be removed.
+if test $ac_cv_header_sys_time_h = yes; then
+  AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
+	     and <time.h>.  This macro is obsolete.])
+fi
+# End of obsolete code.
+
+CURL_CHECK_STRUCT_TIMEVAL
+
+AC_CHECK_TYPE(long long,
+   [AC_DEFINE(HAVE_LONGLONG, 1,
+     [Define to 1 if the compiler supports the 'long long' data type.])]
+   longlong="yes"
+)
+
+if test "xyes" = "x$longlong"; then
+  AC_MSG_CHECKING([if numberLL works])
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+      long long val = 1000LL;
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    AC_DEFINE(HAVE_LL, 1, [if your compiler supports LL])
+  ],[
+    AC_MSG_RESULT([no])
+  ])
+fi
+
+
+# check for ssize_t
+AC_CHECK_TYPE(ssize_t, [ CARES_TYPEOF_ARES_SSIZE_T=ssize_t ],
+  [ CARES_TYPEOF_ARES_SSIZE_T=int ])
+
+AC_DEFINE_UNQUOTED([CARES_TYPEOF_ARES_SSIZE_T], ${CARES_TYPEOF_ARES_SSIZE_T},
+  [the signed version of size_t])
+
+
+# check for bool type
+AC_CHECK_TYPE([bool],[
+  AC_DEFINE(HAVE_BOOL_T, 1,
+    [Define to 1 if bool is an available type.])
+], ,[
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_STDBOOL_H
+#include <stdbool.h>
+#endif
+])
+
+CARES_CONFIGURE_ARES_SOCKLEN_T
+
+TYPE_IN_ADDR_T
+
+TYPE_SOCKADDR_STORAGE
+
+TYPE_SIG_ATOMIC_T
+
+m4_warn([obsolete],
+[your code may safely assume C89 semantics that RETSIGTYPE is void.
+Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.])dnl
+AC_CACHE_CHECK([return type of signal handlers],[ac_cv_type_signal],[AC_COMPILE_IFELSE(
+[AC_LANG_PROGRAM([#include <sys/types.h>
+#include <signal.h>
+],
+		 [return *(signal (0, 0)) (0) == 1;])],
+		   [ac_cv_type_signal=int],
+		   [ac_cv_type_signal=void])])
+AC_DEFINE_UNQUOTED([RETSIGTYPE],[$ac_cv_type_signal],[Define as the return type of signal handlers
+		    (`int' or `void').])
+
+
+CURL_CHECK_FUNC_RECV
+CURL_CHECK_FUNC_RECVFROM
+CURL_CHECK_FUNC_SEND
+CURL_CHECK_MSG_NOSIGNAL
+
+CARES_CHECK_FUNC_CLOSESOCKET
+CARES_CHECK_FUNC_CLOSESOCKET_CAMEL
+CARES_CHECK_FUNC_CONNECT
+CARES_CHECK_FUNC_FCNTL
+CARES_CHECK_FUNC_FREEADDRINFO
+CARES_CHECK_FUNC_GETADDRINFO
+CARES_CHECK_FUNC_GETENV
+CARES_CHECK_FUNC_GETHOSTBYADDR
+CARES_CHECK_FUNC_GETHOSTBYNAME
+CARES_CHECK_FUNC_GETHOSTNAME
+CARES_CHECK_FUNC_GETSERVBYPORT_R
+CARES_CHECK_FUNC_INET_NET_PTON
+CARES_CHECK_FUNC_INET_NTOP
+CARES_CHECK_FUNC_INET_PTON
+CARES_CHECK_FUNC_IOCTL
+CARES_CHECK_FUNC_IOCTLSOCKET
+CARES_CHECK_FUNC_IOCTLSOCKET_CAMEL
+CARES_CHECK_FUNC_SETSOCKOPT
+CARES_CHECK_FUNC_SOCKET
+CARES_CHECK_FUNC_STRCASECMP
+CARES_CHECK_FUNC_STRCMPI
+CARES_CHECK_FUNC_STRDUP
+CARES_CHECK_FUNC_STRICMP
+CARES_CHECK_FUNC_STRNCASECMP
+CARES_CHECK_FUNC_STRNCMPI
+CARES_CHECK_FUNC_STRNICMP
+CARES_CHECK_FUNC_WRITEV
+CARES_CHECK_FUNC_ARC4RANDOM_BUF
+
+
+dnl check for AF_INET6
+CARES_CHECK_CONSTANT(
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#endif
+  ], [PF_INET6],
+     AC_DEFINE_UNQUOTED(HAVE_PF_INET6,1,[Define to 1 if you have PF_INET6.])
+)
+
+dnl check for PF_INET6
+CARES_CHECK_CONSTANT(
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#endif
+  ], [AF_INET6],
+     AC_DEFINE_UNQUOTED(HAVE_AF_INET6,1,[Define to 1 if you have AF_INET6.])
+)
+
+
+dnl check for the in6_addr structure
+CARES_CHECK_STRUCT(
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#endif
+  ], [in6_addr],
+     AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.])
+)
+
+dnl check for the sockaddr_in6 structure
+CARES_CHECK_STRUCT(
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#endif
+  ], [sockaddr_in6],
+     AC_DEFINE_UNQUOTED(HAVE_STRUCT_SOCKADDR_IN6,1,
+       [Define to 1 if you have struct sockaddr_in6.]) ac_have_sockaddr_in6=yes
+)
+
+AC_CHECK_MEMBER(struct sockaddr_in6.sin6_scope_id,
+    AC_DEFINE_UNQUOTED(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID,1,
+      [Define to 1 if your struct sockaddr_in6 has sin6_scope_id.])
+   , ,
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#endif
+  ])
+
+dnl check for the addrinfo structure
+AC_CHECK_MEMBER(struct addrinfo.ai_flags,
+     AC_DEFINE_UNQUOTED(HAVE_STRUCT_ADDRINFO,1,
+       [Define to 1 if you have struct addrinfo.]),,
+  [
+#undef inline
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+#endif
+#else
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#endif
+  ]
+)
+
+
+AC_CHECK_FUNCS([bitncmp \
+  gettimeofday \
+  if_indextoname
+],[
+],[
+  func="$ac_func"
+  AC_MSG_CHECKING([deeper for $func])
+  AC_LINK_IFELSE([
+    AC_LANG_PROGRAM([[
+    ]],[[
+      $func ();
+    ]])
+  ],[
+    AC_MSG_RESULT([yes])
+    eval "ac_cv_func_$func=yes"
+    AC_DEFINE_UNQUOTED(XC_SH_TR_CPP([HAVE_$func]), [1],
+      [Define to 1 if you have the $func function.])
+  ],[
+    AC_MSG_RESULT([but still no])
+  ])
+])
+
+dnl Android. Some variants like arm64 may no longer have __system_property_get
+dnl in libc, but they are defined in the headers.  Perform a link check.
+AC_CHECK_FUNC([__system_property_get], [
+    AC_DEFINE([HAVE___SYSTEM_PROPERTY_GET], [1], [Define if __system_property_get exists.])
+])
+
+dnl Check if the getnameinfo function is available
+dnl and get the types of five of its arguments.
+CURL_CHECK_FUNC_GETNAMEINFO
+
+
+AC_C_BIGENDIAN(
+    [AC_DEFINE(ARES_BIG_ENDIAN, 1,
+      [define this if ares is built for a big endian system])],
+    ,
+    [AC_MSG_WARN([couldn't figure out endianess, assuming little endian!])]
+)
+
+dnl Check for user-specified random device
+AC_ARG_WITH(random,
+AS_HELP_STRING([--with-random=FILE],
+               [read randomness from FILE (default=/dev/urandom)]),
+    [ CARES_RANDOM_FILE="$withval" ],
+    [ CARES_RANDOM_FILE="/dev/urandom" ]
+)
+if test -n "$CARES_RANDOM_FILE" && test X"$CARES_RANDOM_FILE" != Xno ; then
+        AC_SUBST(CARES_RANDOM_FILE)
+        AC_DEFINE_UNQUOTED(CARES_RANDOM_FILE, "$CARES_RANDOM_FILE",
+        [a suitable file/device to read random data from])
+fi
+
+CARES_CHECK_OPTION_NONBLOCKING
+CARES_CHECK_NONBLOCKING_SOCKET
+
+CARES_CONFIGURE_SYMBOL_HIDING
+
+CARES_PRIVATE_LIBS="$LIBS"
+AC_SUBST(CARES_PRIVATE_LIBS)
+
+CARES_CFLAG_EXTRAS=""
+if test X"$want_werror" = Xyes; then
+  CARES_CFLAG_EXTRAS="-Werror"
+fi
+AC_SUBST(CARES_CFLAG_EXTRAS)
+
+dnl squeeze whitespace out of some variables
+
+squeeze CFLAGS
+squeeze CPPFLAGS
+squeeze DEFS
+squeeze LDFLAGS
+squeeze LIBS
+
+squeeze CARES_PRIVATE_LIBS
+
+XC_CHECK_BUILD_FLAGS
+
+AC_MSG_CHECKING([whether to build tests])
+AC_ARG_ENABLE(tests,
+	AS_HELP_STRING([--enable-tests], [build test suite]),
+	[ build_tests="$enableval" ],
+	[ if test "x$HAVE_CXX11" = "x1" && test "x$cross_compiling" = "xno" ; then
+	    build_tests="yes"
+	  else
+	    build_tests="no"
+	  fi
+	]
+)
+
+if test "x$build_tests" = "xyes" ; then
+	if test "x$HAVE_CXX11" = "0" ; then
+		AC_MSG_ERROR([*** Building tests requires a CXX11 compiler])
+	fi
+	if test "x$cross_compiling" = "xyes" ; then
+		AC_MSG_ERROR([*** Tests not supported when cross compiling])
+	fi
+fi
+AC_MSG_RESULT([$build_tests])
+
+
+BUILD_SUBDIRS="include src docs"
+if test "x$build_tests" = "xyes" ; then
+  AC_CONFIG_SUBDIRS([test])
+  BUILD_SUBDIRS="${BUILD_SUBDIRS} test"
+fi
+
+AC_SUBST(BUILD_SUBDIRS)
+
+AC_CONFIG_FILES([Makefile           \
+                 include/Makefile   \
+                 src/Makefile       \
+                 src/lib/Makefile   \
+                 src/tools/Makefile \
+                 docs/Makefile      \
+                 libcares.pc ])
+
+AC_OUTPUT
+XC_AMEND_DISTCLEAN(['.'])