AC_PREREQ([2.69])

AC_INIT([liblo],[0.34],[liblo-devel@lists.sourceforge.net])

# libtool version: current:revision:age
#
# If the library source code has changed at all since the last update, then
# increment revision (`c:r:a' becomes `c:r+1:a').
#
# If any interfaces have been added, removed, or changed since the last update,
# increment current, and set revision to 0.
#
# If any interfaces have been added since the last public release, then
# increment age.
#
# If any interfaces have been removed since the last public release, then set
# age to 0.
m4_define([lt_current], 13)
m4_define([lt_revision], 1)
m4_define([lt_age], 6)

m4_define([lt_version_info], [lt_current:lt_revision:lt_age])
m4_define([lt_current_minus_age], [m4_eval(lt_current - lt_age)])

AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_SRCDIR([src/address.c])
AC_CONFIG_HEADERS([config.h])

AM_INIT_AUTOMAKE
AM_MAINTAINER_MODE
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

AC_ENABLE_STATIC(no)
AC_ENABLE_SHARED(yes)
LO_SO_VERSION=lt_version_info
AC_SUBST(LO_SO_VERSION)
LT_CURRENT_MINUS_AGE=lt_current_minus_age
AC_SUBST(LT_CURRENT_MINUS_AGE)
DLL_NAME=liblo-${LT_CURRENT_MINUS_AGE}.dll
AC_SUBST(DLL_NAME)

AC_DEFINE(LO_SO_VERSION, [{lt_current, lt_revision, lt_age}],
          [Libtool compatibility version])

# disable support for ipv6.
AC_ARG_ENABLE(ipv6, [  --enable-ipv6           Enable ipv6 support],[want_ipv6=$enableval],)
if test "$want_ipv6" = "yes"; then
	AC_DEFINE(ENABLE_IPV6, 1, Define this to enable ipv6.)
fi

# Checks for programs.
AC_PROG_CC
AC_LIBTOOL_WIN32_DLL
AM_PROG_LIBTOOL
AM_PROG_CC_C_O

# Allow documentation to be disabled, otherwise check for doxygen
AC_ARG_ENABLE([doc],
  [AS_HELP_STRING([--disable-doc], [Disable building documentation])],
  [enable_doc=$enableval], [enable_doc=yes])

if test "x$enable_doc" = xyes; then
  AC_CHECK_PROG([DOXYGEN], [doxygen], [doc], [])
  test "x$DOXYGEN" = x && AC_MSG_ERROR([doxygen not found, use --disable-doc to skip documentation])
else
  DOXYGEN=""
fi
AC_SUBST(DOXYGEN)
AM_CONDITIONAL([ENABLE_DOC], [test "x$enable_doc" = xyes])

# If we can add -Qunused-arguments, add it.
# This error occurs when ccache and clang are used together.
AC_MSG_CHECKING([whether to add -Qunused-arguments (C)])
_CFLAGS="$CFLAGS"
CFLAGS="$_CFLAGS -Qunused-arguments"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([],[])],
  [AC_MSG_RESULT([yes])],
  [AC_MSG_RESULT([no])
   CFLAGS="$_CFLAGS"])

# Since we don't require C99, format code for long long int can vary
# in some compilers.  (In particular, MingW seems to require "I64"
# instead of "ll")
AC_MSG_CHECKING([how to print long long int])
_CFLAGS="$CFLAGS"
CFLAGS="$_CFLAGS -Werror -Wall"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([#include <stdio.h>],[printf("%lld", (long long int)0);])],
    [printf_ll=\"ll\"],
    [AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM([#include <stdio.h>],[printf("%I64d", (long long int)0);])],
        [printf_ll=\"I64\"],
        AC_MSG_ERROR([printf doesn't support long long int]))])
AC_MSG_RESULT([$printf_ll])
AC_DEFINE_UNQUOTED([PRINTF_LL],[$printf_ll],[printf code for type long long int])
CFLAGS="$_CFLAGS"

# Check for C++11 features
AC_PROG_CXX
_CXXFLAGS="$CXXFLAGS"
AC_LANG_PUSH([C++])

AC_MSG_CHECKING([whether C++11 lambdas are supported])
CXXFLAGS="$_CXXFLAGS -std=c++11"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([#include <functional>],[[[]](std::function<void()> f){f();}([[]](){0;});])],
    [AC_MSG_RESULT([yes])
     HAVE_LAMBDA=yes],
    [
CXXFLAGS="$_CXXFLAGS -std=c++0x"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([#include <functional>],[[[]](std::function<void()> f){f();}([[]](){0;});])],
    [AC_MSG_RESULT([yes])
     HAVE_LAMBDA=yes],
    [
CXXFLAGS="$_CXXFLAGS -std=c++11 -stdlib=libc++"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([#include <functional>],[[[]](std::function<void()> f){f();}([[]](){0;});])],
    [AC_MSG_RESULT([yes])
     HAVE_LAMBDA=yes],
    [AC_MSG_RESULT([no])
     CXXFLAGS="$_CXXFLAGS"])])])
AM_CONDITIONAL([HAVE_LAMBDA],[test x$HAVE_LAMBDA = xyes])

# If we can add -Qunused-arguments, add it.
# This error occurs when ccache and clang are used together.
AC_MSG_CHECKING([whether to add -Qunused-arguments (C++)])
_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$_CXXFLAGS -Qunused-arguments"
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM([],[])],
  [AC_MSG_RESULT([yes])],
  [AC_MSG_RESULT([no])
   CXXFLAGS="$_CXXFLAGS"])
AC_LANG_POP([C++])

# Check if threads are wanted
AC_ARG_ENABLE(threads,
  [  --enable-threads        Enable server threads],
  [want_threads=$enableval],
  [want_threads=yes])

# Check if win32 threads are wanted
AC_ARG_WITH(win32-threads,
  [  --with-win32-threads    Use win32 threads], [], [with_win32_threads=yes])
if test "x$want_threads" = xyes; then
  AC_CHECK_HEADER([winsock2.h], [HAVE_WINSOCK2_H=yes])
  if test "x$HAVE_WINSOCK2_H" = xyes; then
    if test "x$with_win32_threads" = xyes; then
      have_threads="yes"
    fi
  fi
fi

# Filter out -Werror temporarily, otherwise library checks can fail
CFLAGS_nowerror="`echo $CFLAGS | sed 's/-Werror\([^=]\|$\)//'`"
if test "$CFLAGS" = "$CFLAGS_nowerror"; then
  CFLAGS_werror=
else
  CFLAGS_werror=" -Werror"
  CFLAGS="$CFLAGS_nowerror"
fi

# Checks for libraries.
AC_SEARCH_LIBS([recvfrom], [socket])
AC_CHECK_FUNC([log], [], [AC_CHECK_LIB([m],[log])])
AC_CHECK_FUNCS([getifaddrs])

# Check for whether threads are wanted, and if so, did we find libpthread.
if test "x$want_threads" = "xyes"; then
  if test "x$with_win32_threads" = "xyes" && test "x$have_threads" = "xyes"; then
    AC_DEFINE([HAVE_WIN32_THREADS],[1],[Define to use the win32 library for threading.])
  else
  AC_SEARCH_LIBS([pthread_create], [c pthread],
    [AS_IF([! test x"$ac_res" = x"-lc" && ! test x"$ac_res" = x"none required"],
           [LIBPTHREAD="$ac_res"])
     have_threads=yes;
     HAVE_LIBPTHREAD=1;
     AC_DEFINE([HAVE_LIBPTHREAD],[1],[Define to use the pthread library for threading.])],
     AC_MSG_ERROR([pthread not found. Try option --disable-threads.]))
  fi
  AC_DEFINE(ENABLE_THREADS, [1], [Define this to enable threads.])
fi

# Add back -Werror if it was there before
CFLAGS="$CFLAGS""$CFLAGS_werror"

# Optional threads support
THREADS_ENABLER='#include "lo/lo_serverthread.h"'
THREADS_DISABLER='/* lo/lo_serverthread.h unavailable (--disable-threads) */'
AC_SUBST(LIBPTHREAD)
AC_SUBST(DEFTHREADS)
AC_SUBST(THREADS_INCLUDE)
AM_CONDITIONAL([ENABLE_THREADS], [test "x$have_threads" = xyes])
AS_IF([test x"$have_threads" = xyes],
      [AC_SUBST(ENABLE_THREADS,1)
       AC_SUBST(THREADS_INCLUDE,["$THREADS_ENABLER"])
       AC_SUBST(DEFTHREADS,)],
      [AC_SUBST(ENABLE_THREADS,0)
       AC_SUBST(THREADS_INCLUDE,["$THREADS_DISABLER"])
       AC_SUBST(DEFTHREADS,[';;'])])

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([netdb.h netinet/in.h stdlib.h string.h sys/socket.h unistd.h])

# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
AC_TYPE_UINTPTR_T

# Check for features
AC_CHECK_FUNC([inet_pton], [AC_DEFINE(HAVE_INET_PTON, [1], [Define to 1 if inet_pton() is available.])])
AC_CHECK_FUNC([select], [AC_DEFINE(HAVE_SELECT, [1], [Define to 1 if select() is available.])], [
     AC_MSG_CHECKING([for select in ws2_32])
     extralibs="-lws2_32 -liphlpapi"
     LIBS="$LIBS $extralibs"
     # some winsock2 functions require XP, so WINNT=0x501
     CFLAGS="$CFLAGS -DWIN32 -D_WIN32_WINNT=0x501"
     AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <winsock2.h>]], [[select(0,0,0,0,0)]])],[AC_MSG_RESULT(yes)
                 AC_DEFINE(HAVE_SELECT, [1], [Define to 1 if select() is available.])
                 is_windows=yes],[AC_MSG_RESULT(no)])
])
AC_CHECK_FUNC([setvbuf], [AC_DEFINE(HAVE_SETVBUF, [1], [Define to 1 if setvbuf() is available.])])

AM_CONDITIONAL(WINDOWS, test x$is_windows = xyes)
AM_CONDITIONAL(WINDOWS_DLL, test x$is_windows = xyes && test x$enable_shared = xyes)

if test x$is_windows = xyes; then
  CXXFLAGS="$CXXFLAGS -DWIN32 -D_WIN32_WINNT=0x501"
fi

# Note that configure-time endianness detection may be ignored during
# Apple universal builds, see lo/lo_endian.h.in
LO_BIGENDIAN="2"
AC_C_BIGENDIAN([LO_BIGENDIAN="1"], [LO_BIGENDIAN="0"])
AC_DEFINE_UNQUOTED(LO_BIGENDIAN, "$LO_BIGENDIAN", [If machine is bigendian])
AC_SUBST(LO_BIGENDIAN)

AC_SUBST(extralibs)

# Enable debug compiler flags.  Treat all warnings as errors.
# Necessary to do this here, since -Werror causes problems with some
# autoconf tests used above.
AC_ARG_ENABLE(debug, [  --enable-debug          Enable debug compiler flags])
if test x"$enable_debug" = "xyes"; then
    CF=""
    for i in $CFLAGS; do
        if ! ((test x"$i" = x-g) || (test x"$i" = x-O2)); then
            CF="$CF $i"
        fi
    done
	CFLAGS="$CF -O0 -g -Wall -Werror -DDEBUG"
    CF=""
    for i in $CXXFLAGS; do
        if ! ((test x"$i" = x-g) || (test x"$i" = x-O2)); then
            CF="$CF $i"
        fi
    done
	CXXFLAGS="$CF -O0 -g -Wall -Werror -DDEBUG"
fi

AC_ARG_ENABLE(tests, [  --disable-tests         Disable compiling test programs])
AC_ARG_ENABLE(network-tests, [  --disable-network-tests Disable compiling network-based tests])
AC_ARG_ENABLE(tools, [  --disable-tools         Disable compiling tools])
AC_ARG_ENABLE(examples, [  --disable-examples      Disable compiling examples])

AM_CONDITIONAL([COMPILE_TESTS],[test x$enable_tests != xno])
AM_CONDITIONAL([COMPILE_TOOLS],[test x$enable_tools != xno])
AM_CONDITIONAL([COMPILE_EXAMPLES],[test x$enable_examples != xno])
AM_CONDITIONAL([ENABLE_NETWORK_TESTS],[test x$enable_network_tests != xno])

# Check if poll is wanted
AC_ARG_ENABLE(poll,
  [  --disable-poll        Disable compiling with poll support],
  [want_poll=$enableval],
  [want_poll=yes])

# Check for whether poll is wanted, and if so, did we find it.
if test "x$want_poll" = "xyes"; then
  AC_CHECK_FUNC([poll], [AC_DEFINE(HAVE_POLL, [1], [Define to 1 if poll() is available.])])
fi

if ! test x$enable_network_tests = xno; then
  AC_DEFINE(ENABLE_NETWORK_TESTS, [1],
    [Define this to enable network tests.])
fi

# Display some information about this build
echo
echo About this liblo build:
echo
echo CC=\"$CC\"
echo CXX=\"$CXX\"
echo CFLAGS=\"$CFLAGS\"
echo CXXFLAGS=\"$CXXFLAGS\"
echo LDFLAGS=\"$LDFLAGS\"
echo LIBS=\"$LIBS\"
echo
test x$LO_BIGENDIAN = x0 && echo '== Building for little-endian architecture'
test x$LO_BIGENDIAN = x1 && echo '== Building for big-endian architecture'
test x$enable_debug = xyes && echo '== Compiling in debug mode'
test x$enable_tests = xno && echo '== Disabled tests'
test x$enable_network_tests = xno && echo '== Disabled network-based tests'
test x$enable_tools = xno && echo '== Disabled tools'
test x$enable_examples = xno && echo '== Disabled examples'
test x$have_threads = xyes && echo '== Compile with threading support'
if test x$have_threads = xyes && test "x$HAVE_LIBPTHREAD" = x1; then
  echo '== Compile with libpthread'
else
  test x$have_threads = xyes && test x$with_win32_threads = xyes && echo '== Compile with Win32 threading'
fi
test x$HAVE_LAMBDA = xyes && echo '== Compiling C++ bindings' || echo '== Not compiling C++ bindings'
test x$enable_doc = xno && echo '== Disabled documentation (--disable-doc)'
echo

AC_CONFIG_FILES([
	Makefile
	src/Makefile
	src/tools/Makefile
	src/liblo.def
	examples/Makefile
	lo/Makefile
	lo/lo.h
	lo/lo_endian.h
	liblo.pc
	doc/Makefile
	doc/reference.doxygen
	build/Makefile
	cmake/Makefile
])
AC_OUTPUT

if ! test "x$have_threads" = "xyes"; then
    echo "[[liblo]] Building with server threads disabled."
fi

if ! test "x$ac_cv_func_getifaddrs" = xyes && ! test x$is_windows = xyes; then
    echo "[[liblo]] Warning: Building without interface selection for multicast."
    echo "        This is unusual on Linux, Windows, and OS X, so make sure you"
    echo "        know what you're doing!  May be needed e.g. on Android."
fi