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dnl erlang-extra.m4
AC_DEFUN([ERLANG_SUBST_LIB_VER],
[AC_ERLANG_CHECK_LIB([$1])
ERLANG_LIB_VER_SUBST="$ERLANG_LIB_VER_SUBST -e 's,[@]ERLANG_LIB_VER_$1[@],\$(ERLANG_LIB_VER_$1),g'"
AC_SUBST([ERLANG_LIB_VER_SUBST])
]) # ERLANG_SUBST_LIB_VER
AC_DEFUN([ERLANG_VERSION_CHECK],
[ AC_MSG_CHECKING([Erlang/OTP version])
cat > conftest.erl <<EOF
-module(conftest).
-export([[start/0]]).
start() ->
ERTS = erlang:system_info(version),
RequiredMin = "$1",
RequiredMax = "$2",
Status =
case {string:tokens(RequiredMin, " "),
string:tokens(RequiredMax, " ")} of
{[[MinStr | _]], [[MaxStr | _]]} ->
case check(ERTS, {MinStr, MaxStr}) of
less ->
list_to_binary([[ERTS, " found, ", RequiredMin, " required"]]);
greater ->
list_to_binary([[ERTS, " found, ", RequiredMax, " or earlier required"]]);
ok ->
<<"ok">>
end;
_ ->
list_to_binary([[ERTS, " found, ", RequiredMin, " required"]])
end,
file:write_file("conftest.out", Status),
halt().
check(CurStr, {MinStr, MaxStr}) ->
Cur = parse(CurStr),
Min = parse(MinStr),
Max = parse(MaxStr),
case {less_or_equal(Min, Cur), less_or_equal(Cur, Max)} of
{false, true} -> less;
{true, true} -> ok;
{true, false} -> greater
end.
parse(Version) ->
lists:map(fun(A) -> {Int,[[]]} = string:to_integer(A), Int end,
string:tokens(Version, ".")).
less_or_equal([[]], [[]]) ->
true;
less_or_equal([[Left| Rl]], [[Right| Rr]]) ->
case {Left < Right, Left == Right} of
{true, _} ->
true;
{false, false} ->
false;
{false, true} ->
less_or_equal(Rl, Rr)
end.
EOF
$ERLC conftest.erl || AC_MSG_ERROR(["Could not compile Erlang/OTP version check program using '$ERLC'"])
if ! $ERL -s conftest -noshell -o ! -f conftest.out ; then
AC_MSG_ERROR(["Could not run Erlang/OTP version check program using '$ERL'"])
fi
if test "x`cat conftest.out`" != "xok"; then
AC_MSG_RESULT([failed])
X="`cat conftest.out`"
if test "[$3]" == "warn"; then
AC_MSG_WARN([$X])
else
AC_MSG_FAILURE([$X])
fi
else
AC_MSG_RESULT([ok])
fi
]) dnl ERLANG_VERSION_CHECK
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