dnl nghttp2 - HTTP/2 C Library

dnl Copyright (c) 2012, 2013, 2014, 2015 Tatsuhiro Tsujikawa

dnl Permission is hereby granted, free of charge, to any person obtaining
dnl a copy of this software and associated documentation files (the
dnl "Software"), to deal in the Software without restriction, including
dnl without limitation the rights to use, copy, modify, merge, publish,
dnl distribute, sublicense, and/or sell copies of the Software, and to
dnl permit persons to whom the Software is furnished to do so, subject to
dnl the following conditions:

dnl The above copyright notice and this permission notice shall be
dnl included in all copies or substantial portions of the Software.

dnl THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
dnl EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
dnl MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
dnl NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
dnl LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
dnl OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
dnl WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

dnl Do not change user variables!
dnl http://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html

AC_PREREQ(2.61)
AC_INIT([nghttp2], [0.7.3-DEV], [t-tujikawa@users.sourceforge.net])
LT_PREREQ([2.2.6])
LT_INIT()
dnl See versioning rule:
dnl  http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
AC_SUBST(LT_CURRENT, 9)
AC_SUBST(LT_REVISION, 0)
AC_SUBST(LT_AGE, 4)

major=`echo $PACKAGE_VERSION |cut -d. -f1 | sed -e "s/[^0-9]//g"`
minor=`echo $PACKAGE_VERSION |cut -d. -f2 | sed -e "s/[^0-9]//g"`
patch=`echo $PACKAGE_VERSION |cut -d. -f3 | cut -d- -f1 | sed -e "s/[^0-9]//g"`

PACKAGE_VERSION_NUM=`printf "0x%02x%02x%02x" "$major" "$minor" "$patch"`

AC_SUBST(PACKAGE_VERSION_NUM)

AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

AC_CONFIG_MACRO_DIR([m4])

AM_INIT_AUTOMAKE([subdir-objects])
# comment out for now since this requires automake 1.13 or higher and
# travis has older one.
# AM_EXTRA_RECURSIVE_TARGETS([it])

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

AC_CONFIG_HEADERS([config.h])

dnl Checks for command-line options
AC_ARG_ENABLE([werror],
    [AS_HELP_STRING([--enable-werror],
                    [Turn on compile time warnings])],
    [werror=$enableval], [werror=no])

AC_ARG_ENABLE([debug],
    [AS_HELP_STRING([--enable-debug],
                    [Turn on debug output])],
    [debug=$enableval], [debug=no])

AC_ARG_ENABLE([threads],
    [AS_HELP_STRING([--disable-threads],
                    [Turn off threading in apps])],
    [threads=$enableval], [threads=yes])

AC_ARG_ENABLE([app],
    [AS_HELP_STRING([--enable-app],
                    [Build applications (nghttp, nghttpd and nghttpx) [default=check]])],
    [request_app=$enableval], [request_app=check])

AC_ARG_ENABLE([hpack-tools],
    [AS_HELP_STRING([--enable-hpack-tools],
                    [Build HPACK tools [default=check]])],
    [request_hpack_tools=$enableval], [request_hpack_tools=check])

AC_ARG_ENABLE([asio-lib],
    [AS_HELP_STRING([--enable-asio-lib],
                    [Build C++ libnghttp2_asio library [default=no]])],
    [request_asio_lib=$enableval], [request_asio_lib=no])

AC_ARG_ENABLE([examples],
    [AS_HELP_STRING([--enable-examples],
                    [Build examples [default=check]])],
    [request_examples=$enableval], [request_examples=check])

AC_ARG_ENABLE([python-bindings],
    [AS_HELP_STRING([--enable-python-bindings],
                    [Build Python bindings [default=check]])],
    [request_python_bindings=$enableval], [request_python_bindings=check])

AC_ARG_ENABLE([failmalloc],
    [AS_HELP_STRING([--disable-failmalloc],
                    [Do not build failmalloc test program])],
    [request_failmalloc=$enableval], [request_failmalloc=yes])

AC_ARG_WITH([libxml2],
    [AS_HELP_STRING([--with-libxml2],
                    [Use libxml2 [default=check]])],
    [request_libxml2=$withval], [request_libxml2=check])

AC_ARG_WITH([jemalloc],
    [AS_HELP_STRING([--with-jemalloc],
                    [Use jemalloc [default=check]])],
    [request_jemalloc=$withval], [request_jemalloc=check])

AC_ARG_WITH([spdylay],
    [AS_HELP_STRING([--with-spdylay],
                    [Use spdylay [default=check]])],
    [request_spdylay=$withval], [request_spdylay=check])

AC_ARG_WITH([cython],
    [AS_HELP_STRING([--with-cython=PATH],
                    [Use cython in given PATH])],
    [cython_path=$withval], [])

dnl Define variables
AC_ARG_VAR([CYTHON], [the Cython executable])

dnl Checks for programs
AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
AM_PROG_CC_C_O
PKG_PROG_PKG_CONFIG([0.20])

if [test "x$request_python_bindings" != "xno"]; then
  AM_PATH_PYTHON([2.7],, [:])
  AX_PYTHON_DEVEL([>= '2.7'])
fi

if test "x${cython_path}" = "x"; then
  AC_CHECK_PROGS([CYTHON], [cython.py cython])
else
  CYTHON=${cython_path}
  AC_SUBST([CYTHON])
fi

#
# If we're running GCC or clang define _U_ to be "__attribute__((unused))"
# so we can use _U_ to flag unused function parameters and not get warnings
# about them. Otherwise, define _U_ to be an empty string so that _U_ used
# to flag an unused function parameters will compile with other compilers.
#
# XXX - similar hints for other compilers?
#
if test "x$GCC" = "xyes" -o "x$CC" = "xclang" ; then
  AC_DEFINE([_U_], [__attribute__((unused))], [Hint to the compiler that a function parameters is not used])
else
  AC_DEFINE([_U_], , [Hint to the compiler that a function parameters is not used])
fi

AX_CXX_COMPILE_STDCXX_11([noext], [optional])

AC_LANG_PUSH(C++)

# Check that std::chrono::steady_clock is available. In particular,
# gcc 4.6 does not have one, but has monotonic_clock which is the old
# name existed in the pre-standard draft. If steady_clock is not
# available, don't define HAVE_STEADY_CLOCK and replace steady_clock
# with monotonic_clock.
AC_MSG_CHECKING([whether std::chrono::steady_clock is available])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
#include <chrono>
]],
[[
auto tp = std::chrono::steady_clock::now();
]])],
    [AC_DEFINE([HAVE_STEADY_CLOCK], [1],
               [Define to 1 if you have the `std::chrono::steady_clock`.])
     AC_MSG_RESULT([yes])],
    [AC_MSG_RESULT([no])])

# Check that std::future is available.
AC_MSG_CHECKING([whether std::future is available])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
#include <vector>
#include <future>
]],
[[
std::vector<std::future<int>> v;
]])],
    [AC_DEFINE([HAVE_STD_FUTURE], [1],
               [Define to 1 if you have the `std::future`.])
     have_std_future=yes
     AC_MSG_RESULT([yes])],
    [have_std_future=no
     AC_MSG_RESULT([no])])

# Check that thread_local is available.
AC_MSG_CHECKING([whether thread_local is available])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
]],
[[
thread_local int n;
]])],
    [AC_DEFINE([HAVE_THREAD_LOCAL], [1],
               [Define to 1 if you have the `thread_local`.])
     have_thread_local=yes
     AC_MSG_RESULT([yes])],
    [have_thread_local=no
     AC_MSG_RESULT([no])])

# Check that std::map::emplace is available for g++-4.7.
AC_MSG_CHECKING([whether std::map::emplace is available])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
#include <map>
]],
[[
std::map<int, int>().emplace(1, 2);
]])],
    [AC_DEFINE([HAVE_STD_MAP_EMPLACE], [1],
               [Define to 1 if you have the `std::map::emplace`.])
     have_std_map_emplace=yes
     AC_MSG_RESULT([yes])],
    [have_std_map_emplace=no
     AC_MSG_RESULT([no])])

AC_LANG_POP()

# Checks for libraries.

# Additional libraries required for tests.
TESTLDADD=

# Additional libraries required for programs under src directory.
APPLDFLAGS=

LIBS_OLD=$LIBS
# Search for dlsym function, which is used in tests. Linux needs -ldl,
# but netbsd does not need it.
AC_SEARCH_LIBS([dlsym], [dl])
TESTLDADD="$LIBS $TESTLDADD"
LIBS=$LIBS_OLD

LIBS_OLD=$LIBS
AC_SEARCH_LIBS([clock_gettime], [rt],
               [AC_DEFINE([HAVE_CLOCK_GETTIME], [1],
                          [Define to 1 if you have the `clock_gettime`.])])
APPLDFLAGS="$LIBS $APPLDFLAGS"
LIBS=$LIBS_OLD

case "$host" in
  *android*)
    android_build=yes
    # android does not need -pthread, but needs followng 3 libs for C++
    APPLDFLAGS="$APPLDFLAGS -lstdc++ -latomic -lsupc++"
    ;;
  *)
    PTHREAD_LDFLAGS="-pthread"
    APPLDFLAGS="$APPLDFLAGS $PTHREAD_LDFLAGS"
    ;;
esac

# zlib
if test "x$android_build" = "xyes"; then
  # Use zlib provided by NDK
  APPLDFLAGS="-lz $APPLDFLAGS"
  have_zlib=yes
else
  PKG_CHECK_MODULES([ZLIB], [zlib >= 1.2.3], [have_zlib=yes], [have_zlib=no])

  if test "x${have_zlib}" = "xno"; then
    AC_MSG_NOTICE($ZLIB_PKG_ERRORS)
  fi
fi

# cunit
PKG_CHECK_MODULES([CUNIT], [cunit >= 2.1], [have_cunit=yes], [have_cunit=no])
# If pkg-config does not find cunit, check it using AC_CHECK_LIB.  We
# do this because Debian (Ubuntu) lacks pkg-config file for cunit.
if test "x${have_cunit}" = "xno"; then
  AC_MSG_WARN([${CUNIT_PKG_ERRORS}])
  AC_CHECK_LIB([cunit], [CU_initialize_registry],
               [have_cunit=yes], [have_cunit=no])
  if test "x${have_cunit}" = "xyes"; then
    CUNIT_LIBS="-lcunit"
    CUNIT_CFLAGS=""
    AC_SUBST([CUNIT_LIBS])
    AC_SUBST([CUNIT_CFLAGS])
  fi
fi
if test "x${have_cunit}" = "xyes"; then
  # cunit in Mac OS X requires ncurses. Note that in Mac OS X, test
  # program can be built without -lncurses, but it emits runtime
  # error.
  case "${build}" in
    *-apple-darwin*)
      CUNIT_LIBS="$CUNIT_LIBS -lncurses"
      AC_SUBST([CUNIT_LIBS])
      ;;
  esac
fi

AM_CONDITIONAL([HAVE_CUNIT], [ test "x${have_cunit}" = "xyes" ])

# libev (for src)
# libev does not have pkg-config file.  Check it in an old way.
LIBS_OLD=$LIBS
# android requires -lm for floor
AC_CHECK_LIB([ev], [ev_time], [have_libev=yes], [have_libev=no], [-lm])
if test "x${have_libev}" = "xyes"; then
  AC_CHECK_HEADER([ev.h], [have_libev=yes], [have_libev=no])
  if test "x${have_libev}" = "xyes"; then
    LIBEV_LIBS=-lev
    LIBEV_CFLAGS=
    AC_SUBST([LIBEV_LIBS])
    AC_SUBST([LIBEV_CFLAGS])
  fi
fi
LIBS=$LIBS_OLD

# openssl (for src)
PKG_CHECK_MODULES([OPENSSL], [openssl >= 1.0.1],
                  [have_openssl=yes], [have_openssl=no])
if test "x${have_openssl}" = "xno"; then
  AC_MSG_NOTICE($OPENSSL_PKG_ERRORS)
fi

# libevent_openssl (for examples)
# 2.0.8 is required because we use evconnlistener_set_error_cb()
PKG_CHECK_MODULES([LIBEVENT_OPENSSL], [libevent_openssl >= 2.0.8],
                  [have_libevent_openssl=yes], [have_libevent_openssl=no])
if test "x${have_libevent_openssl}" = "xno"; then
  AC_MSG_NOTICE($LIBEVENT_OPENSSL_PKG_ERRORS)
fi

# jansson (for src/nghttp, src/deflatehd and src/inflatehd)
PKG_CHECK_MODULES([JANSSON], [jansson >= 2.5],
                  [have_jansson=yes], [have_jansson=no])
if test "x${have_jansson}" == "xyes"; then
  AC_DEFINE([HAVE_JANSSON], [1],
            [Define to 1 if you have `libjansson` library.])
else
  AC_MSG_NOTICE($JANSSON_PKG_ERRORS)
fi

# libxml2 (for src/nghttp)
have_libxml2=no
if test "x${request_libxml2}" != "xno"; then
  AM_PATH_XML2(2.7.7, [have_libxml2=yes], [have_libxml2=no])
  if test "x${have_libxml2}" = "xyes"; then
    AC_DEFINE([HAVE_LIBXML2], [1], [Define to 1 if you have `libxml2` library.])
  fi
fi

if test "x${request_libxml2}" = "xyes" &&
   test "x${have_libxml2}" != "xyes"; then
  AC_MSG_ERROR([libxml2 was requested (--with-libxml2) but not found])
fi

AM_CONDITIONAL([HAVE_LIBXML2], [ test "x${have_libxml2}" = "xyes" ])

# jemalloc
have_jemalloc=no
if test "x${request_jemalloc}" != "xno"; then
  LIBS_OLD=$LIBS
  AC_SEARCH_LIBS([malloc_stats_print], [jemalloc], [have_jemalloc=yes], [],
                 [$PTHREAD_LDFLAGS])
  LIBS=$LIBS_OLD
  if test "x${have_jemalloc}" = "xyes" &&
     test "x${ac_cv_search_malloc_stats_print}" != "xnone required"; then
    JEMALLOC_LIBS=${ac_cv_search_malloc_stats_print}
    AC_SUBST([JEMALLOC_LIBS])
  fi
fi

if test "x${request_jemalloc}" = "xyes" &&
   test "x${have_jemalloc}" != "xyes"; then
  AC_MSG_ERROR([jemalloc was requested (--with-jemalloc) but not found])
fi

# spdylay (for src/nghttpx and src/h2load)
have_spdylay=no
if test "x${request_spdylay}" != "xno"; then
  PKG_CHECK_MODULES([LIBSPDYLAY], [libspdylay >= 1.3.0],
                    [have_spdylay=yes], [have_spdylay=no])
  if test "x${have_spdylay}" = "xyes"; then
    AC_DEFINE([HAVE_SPDYLAY], [1], [Define to 1 if you have `spdylay` library.])
  else
    AC_MSG_NOTICE($LIBSPDYLAY_PKG_ERRORS)
    AC_MSG_NOTICE([The SPDY support in nghttpx and h2load will be disabled.])
  fi
fi

if test "x${request_spdylay}" = "xyes" &&
   test "x${have_spdylay}" != "xyes"; then
  AC_MSG_ERROR([spdylay was requested (--with-spdylay) but not found])
fi

AM_CONDITIONAL([HAVE_SPDYLAY], [ test "x${have_spdylay}" = "xyes" ])

# Check Boost Asio library
have_asio_lib=no

if test "x${request_asio_lib}" = "xyes"; then
  AX_BOOST_BASE([1.54.0], [have_boost_base=yes], [have_boost_base=no])

  if test "x${have_boost_base}" = "xyes"; then
    AX_BOOST_ASIO()
    AX_BOOST_SYSTEM()
    AX_BOOST_THREAD()

    if test "x${ax_cv_boost_asio}" = "xyes" &&
       test "x${ax_cv_boost_system}" = "xyes" &&
       test "x${ax_cv_boost_thread}" = "xyes"; then
      have_asio_lib=yes
    fi
  fi
fi

# The nghttp, nghttpd and nghttpx under src depend on zlib, OpenSSL
# and libev
enable_app=no
if test "x${request_app}" != "xno" &&
   test "x${have_zlib}" = "xyes" &&
   test "x${have_openssl}" = "xyes" &&
   test "x${have_libev}" = "xyes"; then
  enable_app=yes
fi

if test "x${request_app}" = "xyes" &&
   test "x${enable_app}" != "xyes"; then
  AC_MSG_ERROR([applications were requested (--enable-app) but dependencies are not met.])
fi

AM_CONDITIONAL([ENABLE_APP], [ test "x${enable_app}" = "xyes" ])

enable_hpack_tools=no
# HPACK tools requires jansson
if test "x${request_hpack_tools}" != "xno" &&
   test "x${have_jansson}" = "xyes"; then
  enable_hpack_tools=yes
fi

if test "x${request_hpack_tools}" = "xyes" &&
   test "x${enable_hpack_tools}" != "xyes"; then
  AC_MSG_ERROR([HPACK tools were requested (--enable-hpack-tools) but dependencies are not met.])
fi

AM_CONDITIONAL([ENABLE_HPACK_TOOLS], [ test "x${enable_hpack_tools}" = "xyes" ])

# C++ library libnghttp2_asio

enable_asio_lib=no
if test "x${request_asio_lib}" != "xno" &&
   test "x${have_asio_lib}" = "xyes"; then
  enable_asio_lib=yes
fi

AM_CONDITIONAL([ENABLE_ASIO_LIB], [ test "x${enable_asio_lib}" = "xyes" ])

# The example programs depend on OpenSSL and libevent_openssl
enable_examples=no
if test "x${request_examples}" != "xno" &&
   test "x${have_openssl}" = "xyes" &&
   test "x${have_libevent_openssl}" = "xyes"; then
  enable_examples=yes
fi

if test "x${request_examples}" = "xyes" &&
   test "x${enable_examples}" != "xyes"; then
  AC_MSG_ERROR([examples were requested (--enable-examples) but dependencies are not met.])
fi

AM_CONDITIONAL([ENABLE_EXAMPLES], [ test "x${enable_examples}" = "xyes" ])

# Python bindings
enable_python_bindings=no
if test "x${request_python_bindings}" != "xno" &&
   test "x${CYTHON}" != "x" &&
   test "x${PYTHON}" != "x:" &&
   test "x${have_python_dev}" = "xyes"; then
  enable_python_bindings=yes
fi

if test "x${request_python_bindings}" = "xyes" &&
   test "x${enable_python_bindings}" != "xyes"; then
  AC_MSG_ERROR([python bindings were requested (--enable-python-bindings) but dependencies are not met.])
fi

AM_CONDITIONAL([ENABLE_PYTHON_BINDINGS],
               [test "x${enable_python_bindings}" = "xyes"])

# Produce cython conditional, so that we can distribute generated C
# source
AM_CONDITIONAL([HAVE_CYTHON], [test "x${CYTHON}" != "x"])

# failmalloc tests
enable_failmalloc=no
if test "x${request_failmalloc}" = "xyes"; then
  enable_failmalloc=yes
fi

AM_CONDITIONAL([ENABLE_FAILMALLOC], [ test "x${enable_failmalloc}" = "xyes" ])

# Checks for header files.
AC_HEADER_ASSERT
AC_CHECK_HEADERS([ \
  arpa/inet.h \
  netinet/in.h \
  pwd.h \
  stddef.h \
  stdint.h \
  stdlib.h \
  string.h \
  time.h \
  unistd.h \
])

case "${host}" in
  *mingw*)
    # For ntohl, ntohs in Windows
    AC_CHECK_HEADERS([winsock2.h])
    ;;
esac

# Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_UINT8_T
AC_TYPE_UINT16_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_CHECK_TYPES([ptrdiff_t])
AC_C_BIGENDIAN
AC_SYS_LARGEFILE

AC_CHECK_MEMBER([struct tm.tm_gmtoff], [have_struct_tm_tm_gmtoff=yes],
                [have_struct_tm_tm_gmtoff=no], [[#include <time.h>]])

if test "x$have_struct_tm_tm_gmtoff" = "xyes"; then
  AC_DEFINE([HAVE_STRUCT_TM_TM_GMTOFF], [1],
            [Define to 1 if you have `struct tm.tm_gmtoff` member.])
fi

# Checks for library functions.
if test "x$cross_compiling" != "xyes"; then
  AC_FUNC_MALLOC
fi
AC_CHECK_FUNCS([ \
  _Exit \
  accept4 \
  getpwnam \
  memmove \
  memset \
  timegm \
])

# timerfd_create was added in linux kernel 2.6.25

AC_CHECK_FUNC([timerfd_create],
              [have_timerfd_create=yes], [have_timerfd_create=no])


# Checks for epoll availability, primarily for examples/tiny-nghttpd
AX_HAVE_EPOLL([have_epoll=yes], [have_epoll=no])

AM_CONDITIONAL([ENABLE_TINY_NGHTTPD],
               [ test "x${have_epoll}" = "xyes" &&
                 test "x${have_timerfd_create}" = "xyes"])

dnl Windows library for winsock2
case "${host}" in
  *mingw*)
    LIBS="$LIBS -lws2_32"
    ;;
esac

ac_save_CFLAGS=$CFLAGS
CFLAGS=

if test "x$werror" != "xno"; then
    AX_CHECK_COMPILE_FLAG([-Wall], [CFLAGS="$CFLAGS -Wall"])
    AX_CHECK_COMPILE_FLAG([-Wextra], [CFLAGS="$CFLAGS -Wextra"])
    AX_CHECK_COMPILE_FLAG([-Werror], [CFLAGS="$CFLAGS -Werror"])
    AX_CHECK_COMPILE_FLAG([-Wmissing-prototypes], [CFLAGS="$CFLAGS -Wmissing-prototypes"])
    AX_CHECK_COMPILE_FLAG([-Wstrict-prototypes], [CFLAGS="$CFLAGS -Wstrict-prototypes"])
    AX_CHECK_COMPILE_FLAG([-Wmissing-declarations], [CFLAGS="$CFLAGS -Wmissing-declarations"])
    AX_CHECK_COMPILE_FLAG([-Wpointer-arith], [CFLAGS="$CFLAGS -Wpointer-arith"])
    AX_CHECK_COMPILE_FLAG([-Wdeclaration-after-statement], [CFLAGS="$CFLAGS -Wdeclaration-after-statement"])
    AX_CHECK_COMPILE_FLAG([-Wformat-security], [CFLAGS="$CFLAGS -Wformat-security"])
    AX_CHECK_COMPILE_FLAG([-Wwrite-strings], [CFLAGS="$CFLAGS -Wwrite-strings"])
    AX_CHECK_COMPILE_FLAG([-Wshadow], [CFLAGS="$CFLAGS -Wshadow"])
    AX_CHECK_COMPILE_FLAG([-Winline], [CFLAGS="$CFLAGS -Winline"])
    AX_CHECK_COMPILE_FLAG([-Wnested-externs], [CFLAGS="$CFLAGS -Wnested-externs"])
    AX_CHECK_COMPILE_FLAG([-Wfloat-equal], [CFLAGS="$CFLAGS -Wfloat-equal"])
    AX_CHECK_COMPILE_FLAG([-Wundef], [CFLAGS="$CFLAGS -Wundef"])
    AX_CHECK_COMPILE_FLAG([-Wendif-labels], [CFLAGS="$CFLAGS -Wendif-labels"])
    AX_CHECK_COMPILE_FLAG([-Wempty-body], [CFLAGS="$CFLAGS -Wempty-body"])
    AX_CHECK_COMPILE_FLAG([-Wcast-align], [CFLAGS="$CFLAGS -Wcast-align"])
    AX_CHECK_COMPILE_FLAG([-Wclobbered], [CFLAGS="$CFLAGS -Wclobbered"])
    AX_CHECK_COMPILE_FLAG([-Wvla], [CFLAGS="$CFLAGS -Wvla"])
    AX_CHECK_COMPILE_FLAG([-Wpragmas], [CFLAGS="$CFLAGS -Wpragmas"])
    AX_CHECK_COMPILE_FLAG([-Wunreachable-code], [CFLAGS="$CFLAGS -Wunreachable-code"])
    AX_CHECK_COMPILE_FLAG([-Waddress], [CFLAGS="$CFLAGS -Waddress"])
    AX_CHECK_COMPILE_FLAG([-Wattributes], [CFLAGS="$CFLAGS -Wattributes"])
    AX_CHECK_COMPILE_FLAG([-Wdiv-by-zero], [CFLAGS="$CFLAGS -Wdiv-by-zero"])
    AX_CHECK_COMPILE_FLAG([-Wshorten-64-to-32], [CFLAGS="$CFLAGS -Wshorten-64-to-32"])

    # Only work with Clang for the moment
    AX_CHECK_COMPILE_FLAG([-Wheader-guard], [CFLAGS="$CFLAGS -Wheader-guard"])
fi

WARNCFLAGS=$CFLAGS
CFLAGS=$ac_save_CFLAGS

AC_SUBST([WARNCFLAGS])

if test "x$debug" != "xno"; then
    AC_DEFINE([DEBUGBUILD], [1], [Define to 1 to enable debug output.])
fi

enable_threads=yes
# Some platform does not have working std::future or thread_local.  We
# disable threading for those platforms.
if test "x$threads" != "xyes" ||
   test "x$have_std_future" != "xyes" ||
   test "x$have_thread_local" != "xyes"; then
    enable_threads=no
    AC_DEFINE([NOTHREADS], [1], [Define to 1 if you want to disable threads.])
fi

AC_SUBST([TESTLDADD])
AC_SUBST([APPLDFLAGS])

AC_CONFIG_FILES([
  Makefile
  lib/Makefile
  lib/libnghttp2.pc
  lib/includes/Makefile
  lib/includes/nghttp2/nghttp2ver.h
  tests/Makefile
  tests/testdata/Makefile
  third-party/Makefile
  src/Makefile
  src/includes/Makefile
  src/libnghttp2_asio.pc
  examples/Makefile
  python/Makefile
  python/setup.py
  integration-tests/Makefile
  integration-tests/config.go
  integration-tests/setenv
  doc/Makefile
  doc/conf.py
  doc/index.rst
  doc/package_README.rst
  doc/tutorial-client.rst
  doc/tutorial-server.rst
  doc/tutorial-hpack.rst
  doc/nghttpx-howto.rst
  doc/h2load-howto.rst
  doc/libnghttp2_asio.rst
  doc/python-apiref.rst
  doc/building-android-binary.rst
  doc/nghttp2.h.rst
  doc/nghttp2ver.h.rst
  doc/asio_http2.h.rst
  doc/contribute.rst
  contrib/Makefile
])
AC_OUTPUT

AC_MSG_NOTICE([summary of build options:

    Version:        ${VERSION} shared $LT_CURRENT:$LT_REVISION:$LT_AGE
    Host type:      ${host}
    Install prefix: ${prefix}
    C compiler:     ${CC}
    CFLAGS:         ${CFLAGS}
    WARNCFLAGS:     ${WARNCFLAGS}
    LDFLAGS:        ${LDFLAGS}
    LIBS:           ${LIBS}
    CPPFLAGS:       ${CPPFLAGS}
    C preprocessor: ${CPP}
    C++ compiler:   ${CXX}
    CXXFLAGS:       ${CXXFLAGS}
    CXXCPP:         ${CXXCPP}
    Library types:  Shared=${enable_shared}, Static=${enable_static}
    Python:
      Python:         ${PYTHON}
      PYTHON_VERSION: ${PYTHON_VERSION}
      pyexecdir:      ${pyexecdir}
      Python-dev:     ${have_python_dev}
      PYTHON_CPPFLAGS:${PYTHON_CPPFLAGS}
      PYTHON_LDFLAGS: ${PYTHON_LDFLAGS}
      Cython:         ${CYTHON}
    Test:
      CUnit:          ${have_cunit}
      Failmalloc:     ${enable_failmalloc}
    Libs:
      OpenSSL:        ${have_openssl}
      Libxml2:        ${have_libxml2}
      Libev:          ${have_libev}
      Libevent(SSL):  ${have_libevent_openssl}
      Spdylay:        ${have_spdylay}
      Jansson:        ${have_jansson}
      Jemalloc:       ${have_jemalloc}
      Boost CPPFLAGS: ${BOOST_CPPFLAGS}
      Boost LDFLAGS:  ${BOOST_LDFLAGS}
      Boost::ASIO:    ${BOOST_ASIO_LIB}
      Boost::System:  ${BOOST_SYSTEM_LIB}
      Boost::Thread:  ${BOOST_THREAD_LIB}
    Features:
      Applications:   ${enable_app}
      HPACK tools:    ${enable_hpack_tools}
      Libnghttp2_asio:${enable_asio_lib}
      Examples:       ${enable_examples}
      Python bindings:${enable_python_bindings}
      Threading:      ${enable_threads}
])