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