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# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_PREREQ(2.61)
#
# The 0MQ version number is extracted from include/zmq.h using
# the version.sh script. Hence, it should be updated there.
# The version in git should reflect the *next* version planned.
#
AC_INIT([zeromq],
        m4_esyscmd([./version.sh | tr -d '\n']),
        [zeromq-dev@lists.zeromq.org])

AC_CONFIG_AUX_DIR(config)
AC_CONFIG_MACRO_DIR(config)
AM_CONFIG_HEADER(src/platform.hpp)
AM_INIT_AUTOMAKE(tar-ustar dist-zip foreign)

# This lets us use PACKAGE_VERSION in Makefiles
AC_SUBST(PACKAGE_VERSION)

# Libtool -version-info (ABI version)
#
# Currently 0.0.0 ("unstable"). Don't change this unless you
# know exactly what you're doing and have read and understand
# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
#
# libzmq -version-info
LTVER="0:0:0"
AC_SUBST(LTVER)

# Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AM_PROG_CC_C_O
AC_LIBTOOL_WIN32_DLL
AC_PROG_LIBTOOL
AC_PROG_SED
AC_PROG_AWK

# Set a helper variable to indicate GNU C and C++ are in use
if test "x$GCC" = "xyes" -a "x$GXX" = "xyes"; then
    gnu_compilers="yes"
else
    gnu_compilers="no"
fi

# Checks for libraries.
AC_CHECK_LIB([pthread], [pthread_create])

# Extra CXXFLAGS are appended at the end of CXXFLAGS for libzmq.
LIBZMQ_EXTRA_CXXFLAGS=""

# Extra LDFLAGS are appended at the end of LDFLAGS for libzmq.
LIBZMQ_EXTRA_LDFLAGS=""

# By default compiling with -pedantic except QNX and OSX.
pedantic="yes"

#By default compiling with -Werror except OSX.
werror="yes"

#Whether we are on mingw or not.
on_mingw32="no"

# Host speciffic checks
AC_CANONICAL_HOST

# Determine whether or not documentation should be built and installed.
build_doc="yes"
install_man="yes"
# Check for asciidoc and xmlto and don't build the docs if these are not installed.
AC_CHECK_PROG(have_asciidoc, asciidoc, yes, no)
AC_CHECK_PROG(have_xmlto, xmlto, yes, no)
if test "x$have_asciidoc" = "xno" -o "x$have_xmlto" = "xno"; then
    build_doc="no"
    # Tarballs built with 'make dist' ship with prebuilt documentation.
    if ! test -f doc/zmq.7; then
        install_man="no"
        AC_MSG_WARN([You are building an unreleased version of 0MQ and asciidoc or xmlto are not installed. Documentation will not be built and manual pages will not be installed.])
    fi
fi
AC_MSG_CHECKING([whether to build documentation])
AC_MSG_RESULT([$build_doc])
AC_MSG_CHECKING([whether to install manpages])
AC_MSG_RESULT([$install_man])

# Set some default features required by 0MQ code.
CPPFLAGS="-D_REENTRANT -D_THREAD_SAFE $CPPFLAGS"

# OS-specific tests
case "${host_os}" in
    *linux*)
        # Define on Linux to enable all library features. Define if using a gnu compiler
        if test "x$gnu_compilers" = "xyes"; then
            CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
        fi
        AC_DEFINE(ZMQ_HAVE_LINUX, 1, [Have Linux OS])
        AC_CHECK_LIB(uuid, main, ,
            [AC_MSG_ERROR([cannot link with -luuid, install uuid-dev.])])
        ;;
    *solaris*)
        # Define on Solaris to enable all library features
        CPPFLAGS="-D_PTHREADS $CPPFLAGS"
        AC_DEFINE(ZMQ_HAVE_SOLARIS, 1, [Have Solaris OS])
        AC_CHECK_LIB(socket, main)
        AC_CHECK_LIB(nsl, main)
        AC_CHECK_LIB(rt, main)
        AC_CHECK_LIB(uuid, main, ,
            [AC_MSG_ERROR([cannot link with -luuid, install uuid-dev.])])
        AC_MSG_CHECKING([whether atomic operations can be used])
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
            [[#include <atomic.h>]],
            [[uint32_t value;
              atomic_cas_32 (&value, 0, 0);
              return 0;]])],
            [solaris_has_atomic=yes],
            [solaris_has_atomic=no])
        AC_MSG_RESULT([$solaris_has_atomic])
        # Solaris 8 does not have atomic operations exported to user space.
        if test "x$solaris_has_atomic" = "xno"; then
            AC_DEFINE(ZMQ_FORCE_MUTEXES, 1, [Force to use mutexes])
        fi
        ;;
    *freebsd*)
        # Define on FreeBSD to enable all library features
        CPPFLAGS="-D__BSD_VISIBLE $CPPFLAGS"
        AC_DEFINE(ZMQ_HAVE_FREEBSD, 1, [Have FreeBSD OS])
        ;;
    *darwin*)
        # Define on Darwin to enable all library features
        CPPFLAGS="-D_DARWIN_C_SOURCE $CPPFLAGS"
        pedantic="no"
        werror="no"
        AC_DEFINE(ZMQ_HAVE_OSX, 1, [Have DarwinOSX OS])
        LIBZMQ_EXTRA_CXXFLAGS+="-Wno-uninitialized"
        ;;
    *netbsd*)
        # Define on NetBSD to enable all library features
        CPPFLAGS="-D_NETBSD_SOURCE $CPPFLAGS"
        AC_DEFINE(ZMQ_HAVE_NETBSD, 1, [Have NetBSD OS])
        # NetBSD 5.0 and newer provides atomic operations but we can
        # only use these on systems where PR #42842 has been fixed so
        # we must try and link a test program using C++.
        netbsd_has_atomic=no
        AC_MSG_CHECKING([whether atomic operations can be used])
        AC_LANG_PUSH([C++])
        AC_LINK_IFELSE([AC_LANG_PROGRAM(
            [[#include <atomic.h>]],
            [[uint32_t value;
              atomic_cas_32 (&value, 0, 0);
              return 0;]])],
            [netbsd_has_atomic=yes],
            [netbsd_has_atomic=no])
        AC_LANG_POP([C++])
        AC_MSG_RESULT([$netbsd_has_atomic])
        if test "x$netbsd_has_atomic" = "xno"; then
            AC_DEFINE(ZMQ_FORCE_MUTEXES, 1, [Force to use mutexes])
        fi
        ;;
    *openbsd*)
        # Define on OpenBSD to enable all library features
        CPPFLAGS="-D_BSD_SOURCE $CPPFLAGS"
        AC_DEFINE(ZMQ_HAVE_OPENBSD, 1, [Have OpenBSD OS])
        ;;
    *nto-qnx*)
        pedantic="no"
        AC_DEFINE(ZMQ_HAVE_QNXNTO, 1, [Have QNX Neutrino OS])
        AC_CHECK_LIB(socket,main)
        AC_CHECK_LIB(crypto,RAND_bytes)
        ;;
    *aix*)
        AC_DEFINE(ZMQ_HAVE_AIX, 1, [Have AIX OS])
        AC_CHECK_LIB(crypto,RAND_bytes)
        ;;
    *hpux*)
        # Define on HP-UX to enable all library features
        CPPFLAGS="-D_POSIX_C_SOURCE=200112L"
        AC_DEFINE(ZMQ_HAVE_HPUX, 1, [Have HPUX OS])
        AC_CHECK_LIB(rt, main)
        ;;
    *mingw32*)
        AC_DEFINE(ZMQ_HAVE_WINDOWS, 1, [Have Windows OS])
        AC_DEFINE(ZMQ_HAVE_MINGW32, 1, [Have MinGW32])
        AC_CHECK_HEADERS(windows.h)
        AC_CHECK_LIB(ws2_32, main, ,
            [AC_MSG_ERROR([cannot link with ws2_32.dll.])])
        AC_CHECK_LIB(rpcrt4, main, ,
            [AC_MSG_ERROR([cannot link with rpcrt4.dll.])])
        AC_CHECK_LIB(iphlpapi, main, ,
            [AC_MSG_ERROR([cannot link with iphlpapi.dll.])])
        CFLAGS="${CFLAGS} -std=c99"
        on_mingw32="yes"
        install_man="no"
        ;;
    *cygwin*)
        # Define on Cygwin to enable all library features
        CPPFLAGS="-D_GNU_SOURCE $CPPFLAGS"
        AC_DEFINE(ZMQ_HAVE_CYGWIN, 1, [Have Cygwin])
        # Cygwin provides libuuid as part of the e2fsprogs package, and somewhat
        # uselessly installs the library in /usr/lib/e2fsprogs
        LDFLAGS="${LDFLAGS} -L/usr/lib/e2fsprogs"
        AC_CHECK_LIB(uuid, uuid_generate, ,
            [AC_MSG_ERROR([cannot link with -luuid, install the e2fsprogs package.])])
        ;;
    *)
        AC_MSG_ERROR([unsupported system: ${host_os}.])
        ;;
esac

# CPU-specific optimizations
case "${host_cpu}" in
    *sparc*)
        if test "x$gnu_compilers" = "xyes"; then
            CPPFLAGS="$CPPFLAGS -mcpu=v9"
        fi
    ;;
    *)
    ;;
esac

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(errno.h arpa/inet.h netinet/tcp.h netinet/in.h stddef.h \
stdlib.h string.h sys/socket.h sys/time.h unistd.h limits.h)

# Check if we have ifaddrs.h header file.
AC_CHECK_HEADERS(ifaddrs.h, [AC_DEFINE(ZMQ_HAVE_IFADDRS, 1, [Have ifaddrs.h header.])])

# Use c++ in subsequent tests
AC_LANG(C++)

# pkg-config is used if found, and is required for builds with OpenPGM.
# However, we need to provide a way to disable it entirely when the user
# knows what she's doing and it's use is undesirable, such as when
# cross-compiling.
AC_ARG_WITH([pkg-config], [AS_HELP_STRING([--without-pkg-config],
    [do not use pkg-config [default=no]])])
if test "x$with_pkg_config" != "xno"; then
    AC_CHECK_PROG(have_pkg_config, pkg-config, yes, no)
fi

# Checks for typedefs, structures, and compiler characteristics.
AC_HEADER_STDBOOL
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_HEADER_TIME
AC_TYPE_UINT32_T
AC_C_VOLATILE

# Substs
stdint="0"
if test "x$HAVE_STDINT_H" = "xyes"; then
    stdint="1"
fi

inttypes="0"
if test "x$HAVE_INTTYPES_H" = "xyes"; then
    inttypes="1"
fi

# PGM extension
pgm_ext="no"

pgm_basename="libpgm-2-1-28~dfsg"

AC_SUBST(pgm_basename)

AC_ARG_WITH([pgm], [AS_HELP_STRING([--with-pgm],
    [build libzmq with PGM extension [default=no]])],
    [with_pgm_ext=yes], [with_pgm_ext=no])

if test "x$with_pgm_ext" != "xno"; then

    AC_MSG_CHECKING([if the PGM extension is supported on this platform])
    # OpenPGM is only supported by the vendor on x86 and AMD64 platforms...
    case "${host_cpu}" in
        i*86|x86_64)
            # Supported
        ;;
        *)
            AC_MSG_ERROR([the PGM extension is not supported on the ${host_cpu} platform.])
        ;;
    esac

    # ... and on Linux/Windows/Solaris systems.
    case "${host_os}" in
        *linux*|*mingw32*|*solaris*)
            LIBZMQ_EXTRA_CXXFLAGS="${LIBZMQ_EXTRA_CXXFLAGS} -Wno-variadic-macros -Wno-long-long "
        ;;
        *)
            AC_MSG_ERROR([the PGM extension is not supported on system ${host_os}.])
        ;;
    esac
    AC_MSG_RESULT([yes])

    # Test if we have pkg-config
    if test "x$with_pkg_config" != "xno"; then
        if test "x$have_pkg_config" != "xyes"; then
            AC_MSG_ERROR([the --with-pgm option requires that pkg-config be installed.]);
        fi

        # Check for OpenPGM dependencies
        PKG_CHECK_MODULES([GLIB], [glib-2.0 gthread-2.0])
        LIBZMQ_EXTRA_CXXFLAGS="${LIBZMQ_EXTRA_CXXFLAGS} ${GLIB_CFLAGS} "
        LIBZMQ_EXTRA_LDFLAGS="${LIBZMQ_EXTRA_LDFLAGS} ${GLIB_LIBS} "
    fi
    
    # Gzip, Perl and Python are required duing PGM build
    AC_CHECK_PROG(have_gzip, gzip, yes, no)
    if test "x$have_gzip" != "xyes"; then
        AC_MSG_ERROR([gzip is required for building the PGM extension.])
    fi
    AC_CHECK_PROG(have_perl, perl, yes, no)
    if test "x$have_perl" != "xyes"; then
        AC_MSG_ERROR([perl is required for building the PGM extension.])
    fi
    AC_CHECK_PROG(have_python, python, yes, no)
    if test "x$have_python" != "xyes"; then
        AC_MSG_ERROR([python is required for building the PGM extension.])
    fi

    # Unpack libpgm
    AC_MSG_NOTICE([Unpacking ${pgm_basename}.tar.gz])
    if ! gzip -dc foreign/openpgm/${pgm_basename}.tar.gz | tar -xf - -C foreign/openpgm/; then
        AC_MSG_ERROR([cannot unpack the foreign/openpgm/${pgm_basename}.tar.gz file.])
    fi

    # Success!
    AC_DEFINE(ZMQ_HAVE_OPENPGM, 1, [Have OpenPGM extension])
    pgm_ext="yes"
fi

# -Wall, -Werror and -pedantic are GNU compiler specific.
# Also, these break OpenPGM so don't specify them if we are building with it.
if test "x$gnu_compilers" = "xyes" -a "x$pgm_ext" = "xno"; then
    CPPFLAGS="-Wall $CPPFLAGS"

    if test "x$pedantic" = "xyes"; then
CPPFLAGS="-pedantic $CPPFLAGS"
    fi

    if test "x$werror" = "xyes"; then
CPPFLAGS="-Werror $CPPFLAGS"
    fi
fi

AM_CONDITIONAL(BUILD_PGM, test "x$pgm_ext" = "xyes")
AM_CONDITIONAL(BUILD_NO_PGM, test "x$pgm_ext" = "xno")
AM_CONDITIONAL(ON_MINGW, test "x$on_mingw32" = "xyes")
AM_CONDITIONAL(INSTALL_MAN, test "x$install_man" = "xyes")
AM_CONDITIONAL(BUILD_DOC, test "x$build_doc" = "xyes")

AC_SUBST(stdint)
AC_SUBST(inttypes)

# Subst LIBZMQ_EXTRA_CXXFLAGS & LDFLAGS
AC_SUBST(LIBZMQ_EXTRA_CXXFLAGS)
AC_SUBST(LIBZMQ_EXTRA_LDFLAGS)


# Checks for library functions.
AC_TYPE_SIGNAL
AC_CHECK_FUNCS(perror gettimeofday memset socket getifaddrs freeifaddrs)

AC_OUTPUT(Makefile src/Makefile doc/Makefile
    perf/Makefile src/libzmq.pc \
    devices/Makefile devices/zmq_forwarder/Makefile \
    devices/zmq_streamer/Makefile devices/zmq_queue/Makefile \
    builds/msvc/Makefile)

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