configure.cmake

# Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms, as
# designated in a particular file or component or in included license
# documentation.  The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have included with MySQL.
# This program is distributed in the hope that it will be useful,  but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
# the GNU General Public License, version 2.0, for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#

INCLUDE (CheckCSourceCompiles)
INCLUDE (CheckCXXSourceCompiles)
INCLUDE (CheckStructHasMember)
INCLUDE (CheckLibraryExists)
INCLUDE (CheckFunctionExists)
INCLUDE (CheckCCompilerFlag)
INCLUDE (CheckCSourceRuns)
INCLUDE (CheckCXXSourceRuns)
INCLUDE (CheckSymbolExists)


# WITH_PIC options.Not of much use, PIC is taken care of on platforms
# where it makes sense anyway.
IF(UNIX)
  IF(APPLE)
    # OSX  executable are always PIC
    SET(WITH_PIC ON)
  ELSE()
    OPTION(WITH_PIC "Generate PIC objects" OFF)
    IF(WITH_PIC)
      SET(CMAKE_C_FLAGS
        "${CMAKE_C_FLAGS} ${CMAKE_SHARED_LIBRARY_C_FLAGS}")
      SET(CMAKE_CXX_FLAGS
        "${CMAKE_CXX_FLAGS} ${CMAKE_SHARED_LIBRARY_CXX_FLAGS}")
    ENDIF()
  ENDIF()
ENDIF()


IF(CMAKE_SYSTEM_NAME MATCHES "SunOS")
  ## Add C flags (e.g. -m64) to CMAKE_SHARED_LIBRARY_C_FLAGS
  ## The client library contains C++ code, so add dependency on libstdc++
  ## See cmake --help-policy CMP0018
  SET(CMAKE_SHARED_LIBRARY_C_FLAGS
    "${CMAKE_SHARED_LIBRARY_C_FLAGS} ${CMAKE_C_FLAGS} -lstdc++")
ENDIF()


# System type affects version_compile_os variable
IF(NOT SYSTEM_TYPE)
  IF(PLATFORM)
    SET(SYSTEM_TYPE ${PLATFORM})
  ELSE()
    SET(SYSTEM_TYPE ${CMAKE_SYSTEM_NAME})
  ENDIF()
ENDIF()

# Check to see if we are using LLVM's libc++ rather than e.g. libstd++
# Can then check HAVE_LLBM_LIBCPP later without including e.g. ciso646.
CHECK_CXX_SOURCE_RUNS("
#include <ciso646>
int main()
{
#ifdef _LIBCPP_VERSION
  return 0;
#else
  return 1;
#endif
}" HAVE_LLVM_LIBCPP)

MACRO(DIRNAME IN OUT)
  GET_FILENAME_COMPONENT(${OUT} ${IN} PATH)
ENDMACRO()

MACRO(EXTEND_CXX_LINK_FLAGS LIBRARY_PATH)
  # Using the $ORIGIN token with the -R option to locate the libraries
  # on a path relative to the executable:
  # We need an extra backslash to pass $ORIGIN to the mysql_config script...
  SET(QUOTED_CMAKE_CXX_LINK_FLAGS
    "${CMAKE_CXX_LINK_FLAGS} -R'\\$ORIGIN/../lib' -R${LIBRARY_PATH}")
  SET(CMAKE_CXX_LINK_FLAGS
    "${CMAKE_CXX_LINK_FLAGS} -R'\$ORIGIN/../lib' -R${LIBRARY_PATH}")
  MESSAGE(STATUS "CMAKE_CXX_LINK_FLAGS ${CMAKE_CXX_LINK_FLAGS}")
ENDMACRO()

MACRO(EXTEND_C_LINK_FLAGS LIBRARY_PATH)
  SET(QUOTED_CMAKE_C_LINK_FLAGS
    "${CMAKE_C_LINK_FLAGS} -R'\\$ORIGIN/../lib' -R${LIBRARY_PATH}")
  SET(CMAKE_C_LINK_FLAGS
    "${CMAKE_C_LINK_FLAGS} -R'\$ORIGIN/../lib' -R${LIBRARY_PATH}")
  MESSAGE(STATUS "CMAKE_C_LINK_FLAGS ${CMAKE_C_LINK_FLAGS}")
  SET(CMAKE_SHARED_LIBRARY_C_FLAGS
    "${CMAKE_SHARED_LIBRARY_C_FLAGS} -R'\$ORIGIN/../lib' -R${LIBRARY_PATH}")
ENDMACRO()

IF(CMAKE_COMPILER_IS_GNUCXX)
  IF (CMAKE_EXE_LINKER_FLAGS MATCHES " -static "
     OR CMAKE_EXE_LINKER_FLAGS MATCHES " -static$")
     SET(HAVE_DLOPEN FALSE CACHE "Disable dlopen due to -static flag" FORCE)
     SET(WITHOUT_DYNAMIC_PLUGINS TRUE)
  ENDIF()
ENDIF()

IF(WITHOUT_DYNAMIC_PLUGINS)
  MESSAGE("Dynamic plugins are disabled.")
ENDIF(WITHOUT_DYNAMIC_PLUGINS)

# Large files, common flag
SET(_LARGEFILE_SOURCE  1)

# Same for structs, setting HAVE_STRUCT_<name> instead
FUNCTION(MY_CHECK_STRUCT_SIZE type defbase)
  CHECK_TYPE_SIZE("struct ${type}" SIZEOF_${defbase})
  IF(SIZEOF_${defbase})
    SET(HAVE_STRUCT_${defbase} 1 PARENT_SCOPE)
  ENDIF()
ENDFUNCTION()

# Searches function in libraries
# if function is found, sets output parameter result to the name of the library
# if function is found in libc, result will be empty
FUNCTION(MY_SEARCH_LIBS func libs result)
  IF(${${result}})
    # Library is already found or was predefined
    RETURN()
  ENDIF()
  CHECK_FUNCTION_EXISTS(${func} HAVE_${func}_IN_LIBC)
  IF(HAVE_${func}_IN_LIBC)
    SET(${result} "" PARENT_SCOPE)
    RETURN()
  ENDIF()
  FOREACH(lib  ${libs})
    CHECK_LIBRARY_EXISTS(${lib} ${func} "" HAVE_${func}_IN_${lib})
    IF(HAVE_${func}_IN_${lib})
      SET(${result} ${lib} PARENT_SCOPE)
      SET(HAVE_${result} 1 PARENT_SCOPE)
      RETURN()
    ENDIF()
  ENDFOREACH()
ENDFUNCTION()

# Find out which libraries to use.

# Figure out threading library
# Defines CMAKE_USE_PTHREADS_INIT and CMAKE_THREAD_LIBS_INIT.
FIND_PACKAGE (Threads)

IF(UNIX)
  MY_SEARCH_LIBS(floor m LIBM)
  IF(NOT LIBM)
    MY_SEARCH_LIBS(__infinity m LIBM)
  ENDIF()
  MY_SEARCH_LIBS(gethostbyname_r  "nsl_r;nsl" LIBNSL)
  MY_SEARCH_LIBS(bind "bind;socket" LIBBIND)
  MY_SEARCH_LIBS(crypt crypt LIBCRYPT)
  MY_SEARCH_LIBS(setsockopt socket LIBSOCKET)
  MY_SEARCH_LIBS(dlopen dl LIBDL)
  MY_SEARCH_LIBS(sched_yield rt LIBRT)
  IF(NOT LIBRT)
    MY_SEARCH_LIBS(clock_gettime rt LIBRT)
  ENDIF()
  MY_SEARCH_LIBS(timer_create rt LIBRT)

  SET(CMAKE_REQUIRED_LIBRARIES
    ${LIBM} ${LIBNSL} ${LIBBIND} ${LIBCRYPT} ${LIBSOCKET} ${LIBDL} ${CMAKE_THREAD_LIBS_INIT} ${LIBRT})
  # Need explicit pthread for gcc -fsanitize=address
  IF(CMAKE_C_FLAGS MATCHES "-fsanitize=")
    SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} pthread)
  ENDIF()

  LIST(LENGTH CMAKE_REQUIRED_LIBRARIES required_libs_length)
  IF(${required_libs_length} GREATER 0)
    LIST(REMOVE_DUPLICATES CMAKE_REQUIRED_LIBRARIES)
  ENDIF()
  LINK_LIBRARIES(${CMAKE_THREAD_LIBS_INIT})

  OPTION(WITH_LIBWRAP "Compile with tcp wrappers support" OFF)
  IF(WITH_LIBWRAP)
    SET(SAVE_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
    SET(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} wrap)
    CHECK_C_SOURCE_COMPILES(
    "
    #include <tcpd.h>
    int allow_severity = 0;
    int deny_severity  = 0;
    int main()
    {
      hosts_access(0);
    }"
    HAVE_LIBWRAP)
    SET(CMAKE_REQUIRED_LIBRARIES ${SAVE_CMAKE_REQUIRED_LIBRARIES})
    IF(HAVE_LIBWRAP)
      SET(LIBWRAP "wrap")
    ELSE()
      MESSAGE(FATAL_ERROR
      "WITH_LIBWRAP is defined, but can not find a working libwrap. "
      "Make sure both the header files (tcpd.h) "
      "and the library (libwrap) are installed.")
    ENDIF()
  ENDIF()
ENDIF()

#
# Tests for header files
#
INCLUDE (CheckIncludeFiles)

CHECK_INCLUDE_FILES (alloca.h HAVE_ALLOCA_H)
CHECK_INCLUDE_FILES (arpa/inet.h HAVE_ARPA_INET_H)
CHECK_INCLUDE_FILES (dirent.h HAVE_DIRENT_H)
CHECK_INCLUDE_FILES (dlfcn.h HAVE_DLFCN_H)
CHECK_INCLUDE_FILES (execinfo.h HAVE_EXECINFO_H)
CHECK_INCLUDE_FILES (fpu_control.h HAVE_FPU_CONTROL_H)
CHECK_INCLUDE_FILES (grp.h HAVE_GRP_H)
CHECK_INCLUDE_FILES (ieeefp.h HAVE_IEEEFP_H)
CHECK_INCLUDE_FILES (langinfo.h HAVE_LANGINFO_H)
CHECK_INCLUDE_FILES (malloc.h HAVE_MALLOC_H)
CHECK_INCLUDE_FILES (netinet/in.h HAVE_NETINET_IN_H)
CHECK_INCLUDE_FILES (poll.h HAVE_POLL_H)
CHECK_INCLUDE_FILES (pwd.h HAVE_PWD_H)
CHECK_INCLUDE_FILES (strings.h HAVE_STRINGS_H) # Used by NDB
CHECK_INCLUDE_FILES (sys/ioctl.h HAVE_SYS_IOCTL_H)
CHECK_INCLUDE_FILES (sys/mman.h HAVE_SYS_MMAN_H)
CHECK_INCLUDE_FILES (sys/resource.h HAVE_SYS_RESOURCE_H)
CHECK_INCLUDE_FILES (sys/select.h HAVE_SYS_SELECT_H)
CHECK_INCLUDE_FILES (sys/socket.h HAVE_SYS_SOCKET_H)
CHECK_INCLUDE_FILES ("curses.h;term.h" HAVE_TERM_H)
CHECK_INCLUDE_FILES (termios.h HAVE_TERMIOS_H)
CHECK_INCLUDE_FILES (termio.h HAVE_TERMIO_H)
CHECK_INCLUDE_FILES (unistd.h HAVE_UNISTD_H)
CHECK_INCLUDE_FILES (sys/wait.h HAVE_SYS_WAIT_H)
CHECK_INCLUDE_FILES (sys/param.h HAVE_SYS_PARAM_H) # Used by NDB/libevent
CHECK_INCLUDE_FILES (fnmatch.h HAVE_FNMATCH_H)
CHECK_INCLUDE_FILES (sys/un.h HAVE_SYS_UN_H)

#
# Tests for functions
#
CHECK_FUNCTION_EXISTS (_aligned_malloc HAVE_ALIGNED_MALLOC)
CHECK_FUNCTION_EXISTS (backtrace HAVE_BACKTRACE)
CHECK_FUNCTION_EXISTS (printstack HAVE_PRINTSTACK)
CHECK_FUNCTION_EXISTS (index HAVE_INDEX)
CHECK_FUNCTION_EXISTS (clock_gettime HAVE_CLOCK_GETTIME)
CHECK_FUNCTION_EXISTS (cuserid HAVE_CUSERID)
CHECK_FUNCTION_EXISTS (directio HAVE_DIRECTIO)
CHECK_FUNCTION_EXISTS (ftruncate HAVE_FTRUNCATE)
CHECK_FUNCTION_EXISTS (compress HAVE_COMPRESS)
CHECK_FUNCTION_EXISTS (crypt HAVE_CRYPT)
CHECK_FUNCTION_EXISTS (dlopen HAVE_DLOPEN)
CHECK_FUNCTION_EXISTS (fchmod HAVE_FCHMOD)
CHECK_FUNCTION_EXISTS (fcntl HAVE_FCNTL)
CHECK_FUNCTION_EXISTS (fdatasync HAVE_FDATASYNC)
CHECK_SYMBOL_EXISTS(fdatasync "unistd.h" HAVE_DECL_FDATASYNC)
CHECK_FUNCTION_EXISTS (fedisableexcept HAVE_FEDISABLEEXCEPT)
CHECK_FUNCTION_EXISTS (fseeko HAVE_FSEEKO)
CHECK_FUNCTION_EXISTS (fsync HAVE_FSYNC)
CHECK_FUNCTION_EXISTS (gethostbyaddr_r HAVE_GETHOSTBYADDR_R)
CHECK_FUNCTION_EXISTS (gethrtime HAVE_GETHRTIME)
CHECK_FUNCTION_EXISTS (getnameinfo HAVE_GETNAMEINFO)
CHECK_FUNCTION_EXISTS (getpass HAVE_GETPASS)
CHECK_FUNCTION_EXISTS (getpassphrase HAVE_GETPASSPHRASE)
CHECK_FUNCTION_EXISTS (getpwnam HAVE_GETPWNAM)
CHECK_FUNCTION_EXISTS (getpwuid HAVE_GETPWUID)
CHECK_FUNCTION_EXISTS (getpwuid_r HAVE_GETPWUID_R)
CHECK_FUNCTION_EXISTS (getlogin_r HAVE_GETLOGIN_R)
CHECK_FUNCTION_EXISTS (getrlimit HAVE_GETRLIMIT)
CHECK_FUNCTION_EXISTS (getrusage HAVE_GETRUSAGE)
CHECK_FUNCTION_EXISTS (initgroups HAVE_INITGROUPS)
CHECK_FUNCTION_EXISTS (issetugid HAVE_ISSETUGID)
CHECK_FUNCTION_EXISTS (getuid HAVE_GETUID)
CHECK_FUNCTION_EXISTS (geteuid HAVE_GETEUID)
CHECK_FUNCTION_EXISTS (getgid HAVE_GETGID)
CHECK_FUNCTION_EXISTS (getegid HAVE_GETEGID)
CHECK_FUNCTION_EXISTS (mmap64 HAVE_MMAP64)
CHECK_FUNCTION_EXISTS (sleep HAVE_SLEEP)
CHECK_FUNCTION_EXISTS (tell HAVE_TELL)
CHECK_FUNCTION_EXISTS (vasprintf HAVE_VASPRINTF)
CHECK_FUNCTION_EXISTS (memalign HAVE_MEMALIGN)
CHECK_FUNCTION_EXISTS (nl_langinfo HAVE_NL_LANGINFO)
CHECK_FUNCTION_EXISTS (ntohll HAVE_HTONLL)

CHECK_FUNCTION_EXISTS (clock_gettime DNS_USE_CPU_CLOCK_FOR_ID)
CHECK_FUNCTION_EXISTS (epoll_create HAVE_EPOLL)
# Temperarily  Quote event port out as we encounter error in port_getn
# on solaris x86
# CHECK_FUNCTION_EXISTS (port_create HAVE_EVENT_PORTS)
CHECK_FUNCTION_EXISTS (inet_ntop HAVE_INET_NTOP)
CHECK_FUNCTION_EXISTS (kqueue HAVE_WORKING_KQUEUE)
CHECK_SYMBOL_EXISTS (timeradd "sys/time.h" HAVE_TIMERADD)
CHECK_SYMBOL_EXISTS (timerclear "sys/time.h" HAVE_TIMERCLEAR)
CHECK_SYMBOL_EXISTS (timercmp "sys/time.h" HAVE_TIMERCMP)
CHECK_SYMBOL_EXISTS (timerisset "sys/time.h" HAVE_TIMERISSET)

#--------------------------------------------------------------------
# Support for WL#2373 (Use cycle counter for timing)
#--------------------------------------------------------------------

CHECK_INCLUDE_FILES(sys/time.h HAVE_SYS_TIME_H)
CHECK_INCLUDE_FILES(sys/times.h HAVE_SYS_TIMES_H)

CHECK_FUNCTION_EXISTS(times HAVE_TIMES)
CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)


#
# Tests for symbols
#

CHECK_SYMBOL_EXISTS(lrand48 "stdlib.h" HAVE_LRAND48)
CHECK_SYMBOL_EXISTS(TIOCGWINSZ "sys/ioctl.h" GWINSZ_IN_SYS_IOCTL)
CHECK_SYMBOL_EXISTS(FIONREAD "sys/ioctl.h" FIONREAD_IN_SYS_IOCTL)
CHECK_SYMBOL_EXISTS(FIONREAD "sys/filio.h" FIONREAD_IN_SYS_FILIO)
CHECK_SYMBOL_EXISTS(SIGEV_THREAD_ID "signal.h;time.h" HAVE_SIGEV_THREAD_ID)
CHECK_SYMBOL_EXISTS(SIGEV_PORT "signal.h;time.h;sys/siginfo.h" HAVE_SIGEV_PORT)

CHECK_SYMBOL_EXISTS(log2  math.h HAVE_LOG2)

# On Solaris, it is only visible in C99 mode
CHECK_SYMBOL_EXISTS(isinf "math.h" HAVE_C_ISINF)

# isinf() prototype not found on Solaris
CHECK_CXX_SOURCE_COMPILES(
"#include  <math.h>
int main() {
  isinf(0.0);
  return 0;
}" HAVE_CXX_ISINF)

IF (HAVE_C_ISINF AND HAVE_CXX_ISINF)
  SET(HAVE_ISINF 1 CACHE INTERNAL "isinf visible in C and C++" FORCE)
ELSE()
  SET(HAVE_ISINF 0 CACHE INTERNAL "isinf visible in C and C++" FORCE)
ENDIF()


# The results of these four checks are only needed here, not in code.
CHECK_FUNCTION_EXISTS (timer_create HAVE_TIMER_CREATE)
CHECK_FUNCTION_EXISTS (timer_settime HAVE_TIMER_SETTIME)
CHECK_FUNCTION_EXISTS (kqueue HAVE_KQUEUE)
CHECK_SYMBOL_EXISTS(EVFILT_TIMER "sys/types.h;sys/event.h;sys/time.h" HAVE_EVFILT_TIMER)
IF(HAVE_KQUEUE AND HAVE_EVFILT_TIMER)
  SET(HAVE_KQUEUE_TIMERS 1 CACHE INTERNAL "Have kqueue timer-related filter")
ELSEIF(HAVE_TIMER_CREATE AND HAVE_TIMER_SETTIME)
  IF(HAVE_SIGEV_THREAD_ID OR HAVE_SIGEV_PORT)
    SET(HAVE_POSIX_TIMERS 1 CACHE INTERNAL "Have POSIX timer-related functions")
  ENDIF()
ENDIF()

IF(NOT HAVE_POSIX_TIMERS AND NOT HAVE_KQUEUE_TIMERS AND NOT WIN32)
  MESSAGE(FATAL_ERROR "No mysys timer support detected!")
ENDIF()

#
# Test for endianess
#
INCLUDE(TestBigEndian)
TEST_BIG_ENDIAN(WORDS_BIGENDIAN)

#
# Tests for type sizes (and presence)
#
INCLUDE (CheckTypeSize)

set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
        -D_LARGEFILE_SOURCE -D_LARGE_FILES -D_FILE_OFFSET_BITS=64
        -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS)

SET(CMAKE_EXTRA_INCLUDE_FILES stdint.h stdio.h sys/types.h)

CHECK_TYPE_SIZE("void *"    SIZEOF_VOIDP)
CHECK_TYPE_SIZE("char *"    SIZEOF_CHARP)
CHECK_TYPE_SIZE("long"      SIZEOF_LONG)
CHECK_TYPE_SIZE("short"     SIZEOF_SHORT)
CHECK_TYPE_SIZE("int"       SIZEOF_INT)
CHECK_TYPE_SIZE("long long" SIZEOF_LONG_LONG)
CHECK_TYPE_SIZE("off_t"     SIZEOF_OFF_T)
CHECK_TYPE_SIZE("time_t"    SIZEOF_TIME_T)

# If finds the size of a type, set SIZEOF_<type> and HAVE_<type>
FUNCTION(MY_CHECK_TYPE_SIZE type defbase)
  CHECK_TYPE_SIZE("${type}" SIZEOF_${defbase})
  IF(SIZEOF_${defbase})
    SET(HAVE_${defbase} 1 PARENT_SCOPE)
  ENDIF()
ENDFUNCTION()

# We are only interested in presence for these
MY_CHECK_TYPE_SIZE(uint UINT)
MY_CHECK_TYPE_SIZE(ulong ULONG)
MY_CHECK_TYPE_SIZE(u_int32_t U_INT32_T)

IF(HAVE_IEEEFP_H)
  SET(CMAKE_EXTRA_INCLUDE_FILES ieeefp.h)
  MY_CHECK_TYPE_SIZE(fp_except FP_EXCEPT)
ENDIF()

SET(CMAKE_EXTRA_INCLUDE_FILES)

#
# Code tests
#

IF(CMAKE_COMPILER_IS_GNUCXX AND HAVE_CXXABI_H)
CHECK_CXX_SOURCE_COMPILES("
 #include <cxxabi.h>
 int main(int argc, char **argv)
  {
    char *foo= 0; int bar= 0;
    foo= abi::__cxa_demangle(foo, foo, 0, &bar);
    return 0;
  }"
  HAVE_ABI_CXA_DEMANGLE)
ENDIF()

CHECK_C_SOURCE_COMPILES("
  int main(int argc, char **argv)
  {
    extern char *__bss_start;
    return __bss_start ? 1 : 0;
  }"
HAVE_BSS_START)

CHECK_C_SOURCE_COMPILES("
int main()
{
  __builtin_unreachable();
  return 0;
}" HAVE_BUILTIN_UNREACHABLE)

CHECK_C_SOURCE_COMPILES("
int main()
{
  long l= 0;
  __builtin_expect(l, 0);
  return 0;
}" HAVE_BUILTIN_EXPECT)

# GCC has __builtin_stpcpy but still calls stpcpy
IF(NOT CMAKE_SYSTEM_NAME MATCHES "SunOS" OR NOT CMAKE_COMPILER_IS_GNUCC)
CHECK_C_SOURCE_COMPILES("
int main()
{
  char foo1[1];
  char foo2[1];
  __builtin_stpcpy(foo1, foo2);
  return 0;
}" HAVE_BUILTIN_STPCPY)
ENDIF()

CHECK_CXX_SOURCE_COMPILES("
  int main()
  {
    int foo= -10; int bar= 10;
    long long int foo64= -10; long long int bar64= 10;
    if (!__sync_fetch_and_add(&foo, bar) || foo)
      return -1;
    bar= __sync_lock_test_and_set(&foo, bar);
    if (bar || foo != 10)
      return -1;
    bar= __sync_val_compare_and_swap(&bar, foo, 15);
    if (bar)
      return -1;
    if (!__sync_fetch_and_add(&foo64, bar64) || foo64)
      return -1;
    bar64= __sync_lock_test_and_set(&foo64, bar64);
    if (bar64 || foo64 != 10)
      return -1;
    bar64= __sync_val_compare_and_swap(&bar64, foo, 15);
    if (bar64)
      return -1;
    return 0;
  }"
  HAVE_GCC_ATOMIC_BUILTINS)

IF(WITH_VALGRIND)
  SET(VALGRIND_HEADERS "valgrind/memcheck.h;valgrind/valgrind.h")
  CHECK_INCLUDE_FILES("${VALGRIND_HEADERS}" HAVE_VALGRIND_HEADERS)
  IF(HAVE_VALGRIND_HEADERS)
    SET(HAVE_VALGRIND 1)
  ELSE()
    MESSAGE(FATAL_ERROR "Unable to find Valgrind header files ${VALGRIND_HEADERS}. Make sure you have them in your include path.")
  ENDIF()
ENDIF()

#--------------------------------------------------------------------
# Check for IPv6 support
#--------------------------------------------------------------------
CHECK_INCLUDE_FILE(netinet/in6.h HAVE_NETINET_IN6_H) # Used by libevent

IF(UNIX)
  SET(CMAKE_EXTRA_INCLUDE_FILES sys/types.h netinet/in.h sys/socket.h)
  IF(HAVE_NETINET_IN6_H)
    SET(CMAKE_EXTRA_INCLUDE_FILES ${CMAKE_EXTRA_INCLUDE_FILES} netinet/in6.h)
  ENDIF()
ELSEIF(WIN32)
  SET(CMAKE_EXTRA_INCLUDE_FILES ${CMAKE_EXTRA_INCLUDE_FILES} winsock2.h ws2ipdef.h)
ENDIF()

MY_CHECK_STRUCT_SIZE("sockaddr_in6" SOCKADDR_IN6)
MY_CHECK_STRUCT_SIZE("in6_addr" IN6_ADDR)

IF(HAVE_STRUCT_SOCKADDR_IN6 OR HAVE_STRUCT_IN6_ADDR)
  SET(HAVE_IPV6 TRUE CACHE INTERNAL "")
ENDIF()


# Check for sockaddr_storage.ss_family

CHECK_STRUCT_HAS_MEMBER("struct sockaddr_storage"
 ss_family "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_SOCKADDR_STORAGE_SS_FAMILY)
IF(NOT HAVE_SOCKADDR_STORAGE_SS_FAMILY)
  CHECK_STRUCT_HAS_MEMBER("struct sockaddr_storage"
  __ss_family "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_SOCKADDR_STORAGE___SS_FAMILY)
  IF(HAVE_SOCKADDR_STORAGE___SS_FAMILY)
    SET(ss_family __ss_family)
  ENDIF()
ENDIF()

#
# Check if struct sockaddr_in::sin_len is available.
#

CHECK_STRUCT_HAS_MEMBER("struct sockaddr_in" sin_len
  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_SOCKADDR_IN_SIN_LEN)

#
# Check if struct sockaddr_in6::sin6_len is available.
#

CHECK_STRUCT_HAS_MEMBER("struct sockaddr_in6" sin6_len
  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_SOCKADDR_IN6_SIN6_LEN)

CHECK_CXX_SOURCE_COMPILES(
  "
  #include <vector>
  template<typename T>
  class ct2
  {
  public:
    typedef T type;
    void func();
  };

  template<typename T>
  void ct2<T>::func()
  {
    std::vector<T> vec;
    std::vector<T>::iterator itr = vec.begin();
  }

  int main(int argc, char **argv)
  {
    ct2<double> o2;
    o2.func();
    return 0;
  }
  " HAVE_IMPLICIT_DEPENDENT_NAME_TYPING)

SET(CMAKE_EXTRA_INCLUDE_FILES)