1 dnl lz4.m4: Tinc autoconf integration for the LZ4 codec.
2 dnl Copyright 2015 Darik Horn <dajhorn@vanadac.com>.
4 dnl This program is free software; you can redistribute it and/or modify
5 dnl it under the terms of the GNU General Public License as published by
6 dnl the Free Software Foundation; either version 2 of the License, or
7 dnl (at your option) any later version.
9 dnl This program is distributed in the hope that it will be useful,
10 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
11 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 dnl GNU General Public License for more details.
14 dnl You should have received a copy of the GNU General Public License along
15 dnl with this program; if not, write to the Free Software Foundation, Inc.,
16 dnl 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 AC_DEFUN([tinc_LZ4], [
22 AS_HELP_STRING([--disable-lz4], [disable lz4 compression support]))
24 AC_ARG_ENABLE([lz4-builtin],
25 AS_HELP_STRING([--disable-lz4-builtin], [do not use lz4 builtin]))
27 AS_IF([test "x$enable_lz4" != "xno"], [
28 AC_DEFINE(HAVE_LZ4, 1, [enable lz4 compression support])
31 AS_HELP_STRING([--with-lz4=DIR], [lz4 shared library prefix (eg: /usr/local)]),
33 CPPFLAGS="$CPPFLAGS-I$withval/include"
34 LDFLAGS="$LDFLAGS -L$withval/lib"]
37 AC_ARG_WITH(lz4-include,
38 AS_HELP_STRING([--with-lz4-include=DIR], [lz4 shared header directory]),
39 [lz4_include="$withval"
40 CPPFLAGS="$CPPFLAGS -I$withval"]
44 AS_HELP_STRING([--with-lz4-lib=DIR], [lz4 shared object directory]),
46 LDFLAGS="$LDFLAGS -L$withval"]
49 dnl First we check the system copy of the library
50 AS_IF([test "x$enable_lz4_builtin" != 'xyes'], [
51 AC_CHECK_HEADERS(lz4.h, [
52 AC_CHECK_LIB(lz4, LZ4_compress_fast_extState,
58 dnl If it was not found or is too old, fallback to the built-in copy
59 AS_IF([test "x$enable_lz4_builtin" != 'xno' -a "x$lz4_header" = 'x'], [
60 lz4_header='"lib/lz4/lz4.h"'
62 AC_DEFINE(HAVE_LZ4_BUILTIN, 1, [Enable lz4 builtin.])
65 dnl If the first one failed and the second one is disabled, there's nothing more we can do
66 AS_IF([test "x$lz4_header" = 'x'], [
67 AC_MSG_ERROR("lz4 library was not found and fallback to builtin is disabled.");
72 AC_DEFINE_UNQUOTED(LZ4_H, [$lz4_header], [Location of lz4.h])
74 AM_CONDITIONAL([CONFIGURE_LZ4_BUILTIN], [test "x$lz4_builtin" = 'x1'])