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dnl -*- Autoconf -*- fragment for the C++ daemon.

AC_MSG_CHECKING([whether to build daemon])
AC_MSG_RESULT([$guix_build_daemon])

dnl C++ environment.  This macro must be used unconditionnaly.
AC_PROG_CXX
AM_PROG_AR
AC_LANG([C++])

if test "x$guix_build_daemon" = "xyes"; then

  GUIX_ASSERT_CXX11

  AC_PROG_RANLIB
  AC_CONFIG_HEADER([nix/config.h])

  dnl Use 64-bit file system calls so that we can support files > 2 GiB.
  AC_SYS_LARGEFILE

  dnl Look for zlib, a required dependency.
  AC_CHECK_LIB([z], [gzdopen], [true],
    [AC_MSG_ERROR([Guix requires zlib.  See http://www.zlib.net/.])])
  AC_CHECK_HEADERS([zlib.h], [true],
    [AC_MSG_ERROR([Guix requires zlib.  See http://www.zlib.net/.])])

  dnl Look for libbz2, an optional dependency.
  AC_CHECK_LIB([bz2], [BZ2_bzWriteOpen], [HAVE_LIBBZ2=yes], [HAVE_LIBBZ2=no])
  if test "x$HAVE_LIBBZ2" = xyes; then
    AC_CHECK_HEADERS([bzlib.h])
    HAVE_LIBBZ2="$ac_cv_header_bzlib_h"
  fi

  dnl Look for SQLite, a required dependency.
  PKG_CHECK_MODULES([SQLITE3], [sqlite3 >= 3.6.19])

  AC_DEFINE([NIX_VERSION], ["0.0.0"], [Fake Nix version number.])
  AC_DEFINE_UNQUOTED([SYSTEM], ["$guix_system"],
    [Guix host system type--i.e., platform and OS kernel tuple.])

  case "$LIBGCRYPT_PREFIX" in
    no)
      LIBGCRYPT_CFLAGS=""
      ;;
    *)
      LIBGCRYPT_CFLAGS="-I$LIBGCRYPT_PREFIX/include"
      ;;
  esac

  case "$LIBGCRYPT_LIBDIR" in
    no | "")
      LIBGCRYPT_LIBS="-lgcrypt"
      ;;
    *)
      LIBGCRYPT_LIBS="-L$LIBGCRYPT_LIBDIR -lgcrypt"
      ;;
  esac

  AC_SUBST([LIBGCRYPT_CFLAGS])
  AC_SUBST([LIBGCRYPT_LIBS])

  save_CFLAGS="$CFLAGS"
  save_LDFLAGS="$LDFLAGS"
  CFLAGS="$CFLAGS $LIBGCRYPT_CFLAGS"
  LDFLAGS="$LDFLAGS $LIBGCRYPT_LDFLAGS"

  have_gcrypt=yes
  AC_CHECK_LIB([gcrypt], [gcry_md_open], [:], [have_gcrypt=no])
  AC_CHECK_HEADER([gcrypt.h], [:], [have_gcrypt=no])
  if test "x$have_gcrypt" != "xyes"; then
    AC_MSG_ERROR([GNU libgcrypt not found; please install it.])
  fi

  CFLAGS="$save_CFLAGS"
  LDFLAGS="$save_LDFLAGS"

  dnl Chroot support.
  AC_CHECK_FUNCS([chroot unshare])
  AC_CHECK_HEADERS([sched.h sys/param.h sys/mount.h sys/syscall.h])

  if test "x$ac_cv_func_chroot" != "xyes"; then
    AC_MSG_ERROR(['chroot' function missing, bailing out])
  fi

  dnl lutimes and lchown: used when canonicalizing store items.
  dnl posix_fallocate: used when extracting archives.
  dnl vfork: to speed up spawning of helper programs.
  dnl   `--> now disabled because of unpredictable behavior:
  dnl        see <http://lists.gnu.org/archive/html/guix-devel/2014-05/msg00036.html>
  dnl        and Nix commit f794465c (Nov. 2012).
  dnl sched_setaffinity: to improve RPC locality.
  dnl statvfs: to detect disk-full conditions.
  dnl strsignal: for error reporting.
  AC_CHECK_FUNCS([lutimes lchown posix_fallocate sched_setaffinity \
     statvfs nanosleep strsignal])

  dnl Check whether the store optimiser can optimise symlinks.
  AC_MSG_CHECKING([whether it is possible to create a link to a symlink])
  ln -s bla tmp_link
  if ln tmp_link tmp_link2 2> /dev/null; then
      AC_MSG_RESULT(yes)
      AC_DEFINE(CAN_LINK_SYMLINK, 1, [Whether link() works on symlinks.])
  else
      AC_MSG_RESULT(no)
  fi
  rm -f tmp_link tmp_link2

  dnl Check for <locale>.
  AC_LANG_PUSH(C++)
  AC_CHECK_HEADERS([locale])
  AC_LANG_POP(C++)


  dnl Check whether we have the `personality' syscall, which allows us
  dnl to do i686-linux builds on x86_64-linux machines.
  AC_CHECK_HEADERS([sys/personality.h])

  dnl Check for <linux/fs.h> (for immutable file support).
  AC_CHECK_HEADERS([linux/fs.h])

  dnl Determine the appropriate default list of substitute URLs (GnuTLS
  dnl is required so we can default to 'https'.)
  guix_substitute_urls="https://ci.guix.gnu.org"

  AC_MSG_CHECKING([for default substitute URLs])
  AC_MSG_RESULT([$guix_substitute_urls])

  AC_DEFINE_UNQUOTED([GUIX_SUBSTITUTE_URLS], ["$guix_substitute_urls"],
    [Default list of substitute URLs used by 'guix-daemon'.])

  dnl Check for Guile-SSH, which is required by 'guix offload'.
  GUIX_CHECK_GUILE_SSH

  case "x$guix_cv_have_recent_guile_ssh" in
    xyes)
      guix_build_daemon_offload="yes"
      AC_DEFINE([HAVE_DAEMON_OFFLOAD_HOOK], [1],
	[Define if the daemon's 'offload' build hook is being built (requires Guile-SSH).])
      ;;
    *)
      guix_build_daemon_offload="no"
      ;;
  esac

  dnl Temporary directory used to store the daemon's data.
  GUIX_TEST_ROOT_DIRECTORY
  GUIX_TEST_ROOT="$ac_cv_guix_test_root"
  AC_SUBST([GUIX_TEST_ROOT])

  GUIX_CHECK_LOCALSTATEDIR
fi

AM_CONDITIONAL([HAVE_LIBBZ2], [test "x$HAVE_LIBBZ2" = "xyes"])
AM_CONDITIONAL([BUILD_DAEMON], [test "x$guix_build_daemon" = "xyes"])
AM_CONDITIONAL([BUILD_DAEMON_OFFLOAD],			\
  [test "x$guix_build_daemon" = "xyes"			\
   && test "x$guix_build_daemon_offload" = "xyes"])
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