+
+ 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$ac_cv_func_chroot" != "xyes"; then
+ AC_MSG_ERROR(['chroot' function missing, bailing out])
+ fi
+
+ dnl lutimes and lchown: used when canonicalizing store items.
+ dnl posix_fallocate: used when extracting archives.
+ dnl vfork: to speed up spawning of helper programs.
+ dnl `--> now disabled because of unpredictable behavior:
+ dnl see <http://lists.gnu.org/archive/html/guix-devel/2014-05/msg00036.html>
+ dnl and Nix commit f794465c (Nov. 2012).
+ dnl sched_setaffinity: to improve RPC locality.
+ dnl statvfs: to detect disk-full conditions.
+ dnl strsignal: for error reporting.
+ dnl statx: fine-grain 'stat' call, new in glibc 2.28.
+ AC_CHECK_FUNCS([lutimes lchown posix_fallocate sched_setaffinity \
+ statvfs nanosleep strsignal statx])
+
+ dnl Check whether the store optimiser can optimise symlinks.
+ AC_MSG_CHECKING([whether it is possible to create a link to a symlink])
+ ln -s bla tmp_link
+ if ln tmp_link tmp_link2 2> /dev/null; then
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(CAN_LINK_SYMLINK, 1, [Whether link() works on symlinks.])
+ else
+ AC_MSG_RESULT(no)
+ fi
+ rm -f tmp_link tmp_link2
+
+ dnl Check for <locale>.
+ AC_LANG_PUSH(C++)
+ AC_CHECK_HEADERS([locale])
+ AC_LANG_POP(C++)
+
+
+ dnl Check whether we have the `personality' syscall, which allows us
+ dnl to do i686-linux builds on x86_64-linux machines.
+ AC_CHECK_HEADERS([sys/personality.h])
+
+ dnl Determine the appropriate default list of substitute URLs (GnuTLS
+ dnl is required so we can default to 'https'.)
+ guix_substitute_urls="https://ci.guix.gnu.org"
+
+ AC_MSG_CHECKING([for default substitute URLs])
+ AC_MSG_RESULT([$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