AC_DEFUN([tinc_LZ4], [
AC_ARG_ENABLE([lz4],
- AS_HELP_STRING([--disable-lz4], [disable all lz4 compression support])
- )
+ AS_HELP_STRING([--disable-lz4], [disable lz4 compression support]))
AC_ARG_ENABLE([lz4-builtin],
- AS_HELP_STRING([--disable-lz4-builtin], [required to link an lz4 library])
- )
+ AS_HELP_STRING([--disable-lz4-builtin], [do not use lz4 builtin]))
- AC_ARG_WITH(lz4,
- AS_HELP_STRING([--with-lz4=DIR], [lz4 shared library prefix (eg: /usr/local)]),
- [lz4="$withval" CPPFLAGS="$CPPFLAGS -I$withval/include" LDFLAGS="$LDFLAGS -L$withval/lib"]
- )
+ AS_IF([test "x$enable_lz4" != "xno"], [
+ AC_DEFINE(HAVE_LZ4, 1, [enable lz4 compression support])
- AC_ARG_WITH(lz4-include,
- AS_HELP_STRING([--with-lz4-include=DIR], [lz4 shared header directory]),
- [lz4_include="$withval" CPPFLAGS="$CPPFLAGS -I$withval"]
- )
-
- AC_ARG_WITH(lz4-lib,
- AS_HELP_STRING([--with-lz4-lib=DIR], [lz4 shared object directory]),
- [lz4_lib="$withval" LDFLAGS="$LDFLAGS -L$withval"]
- )
-
- dnl Calling this early prevents autoconf lint.
- AM_CONDITIONAL([CONFIGURE_LZ4_BUILTIN], [test "$enable_lz4_builtin" != 'no'])
-
- AS_IF([test "$enable_lz4" != 'no' -a "$enable_lz4_builtin" != 'no' ], [
- AC_DEFINE(HAVE_LZ4, 1, [Enable lz4 support.])
- AC_DEFINE(HAVE_LZ4_BUILTIN, 1, [Enable lz4 builtin.])
- AC_DEFINE(HAVE_LZ4_STATE, 1, [Enable lz4 external state features.])
- AC_DEFINE(
- [LZ4_compress_shim(a, b, c, d)],
- [LZ4_compress_fast_extState(lz4_wrkmem, a, b, c, d, 0)],
- [This is the best interface for the lz4 builtin.]
+ AC_ARG_WITH(lz4,
+ AS_HELP_STRING([--with-lz4=DIR], [lz4 shared library prefix (eg: /usr/local)]),
+ [lz4="$withval"
+ CPPFLAGS="$CPPFLAGS-I$withval/include"
+ LDFLAGS="$LDFLAGS -L$withval/lib"]
)
- ],[
- AS_IF([test "$enable_lz4" != 'no'], [
- AC_CHECK_HEADERS(lz4.h, [
- AC_DEFINE(LZ4_H, [<lz4.h>], [Location of lz4.h])
- AC_CHECK_LIB(lz4, LZ4_compress_fast_extState, [
- LIBS="$LIBS -llz4"
- AC_DEFINE(HAVE_LZ4, 1, [Enable lz4 compression support.])
- AC_DEFINE(HAVE_LZ4_STATE, 1, [Enable lz4 external state features.])
- AC_DEFINE(
- [LZ4_compress_shim(a, b, c, d)],
- [LZ4_compress_fast_extState(lz4_wrkmem, a, b, c, d, 0)],
- [The lz4-r129 library interface.]
- )
- break
- ])
-
- AC_CHECK_LIB(lz4, LZ4_compress_default, [
- LIBS="$LIBS -llz4"
- AC_DEFINE(HAVE_LZ4, 1, [Enable lz4 compression support.])
- AC_DEFINE(
- [LZ4_compress_shim(a, b, c, d)],
- [LZ4_compress_default(a, b, c, d)],
- [The lz4-r128 library interface.]
- )
- break
- ])
+ AC_ARG_WITH(lz4-include,
+ AS_HELP_STRING([--with-lz4-include=DIR], [lz4 shared header directory]),
+ [lz4_include="$withval"
+ CPPFLAGS="$CPPFLAGS -I$withval"]
+ )
- AC_CHECK_LIB(lz4, LZ4_compress_limitedOutput, [
- LIBS="$LIBS -llz4"
- AC_DEFINE(HAVE_LZ4, 1, [Enable lz4 compression support.])
- AC_DEFINE(
- [LZ4_compress_shim(a, b, c, d)],
- [LZ4_compress_limitedOutput(a, b, c, d)],
- [The lz4-r59 library interface.]
- )
- AC_MSG_WARN("Using deprecated lz4-r59 interface.")
- break
- ])
+ AC_ARG_WITH(lz4-lib,
+ AS_HELP_STRING([--with-lz4-lib=DIR], [lz4 shared object directory]),
+ [lz4_lib="$withval"
+ LDFLAGS="$LDFLAGS -L$withval"]
+ )
- ],[
- AC_MSG_ERROR("lz4.h header file not found.")
- break
+ dnl First we check the system copy of the library
+ AS_IF([test "x$enable_lz4_builtin" != 'xyes'], [
+ AC_CHECK_HEADERS(lz4.h, [
+ AC_CHECK_LIB(lz4, LZ4_compress_fast_extState,
+ [lz4_header='<lz4.h>'
+ LIBS="$LIBS -llz4"])
])
+ ])
+
+ dnl If it was not found or is too old, fallback to the built-in copy
+ AS_IF([test "x$enable_lz4_builtin" != 'xno' -a "x$lz4_header" = 'x'], [
+ lz4_header='"lib/lz4/lz4.h"'
+ lz4_builtin=1
+ AC_DEFINE(HAVE_LZ4_BUILTIN, 1, [Enable lz4 builtin.])
+ ])
+ dnl If the first one failed and the second one is disabled, there's nothing more we can do
+ AS_IF([test "x$lz4_header" = 'x'], [
+ AC_MSG_ERROR("lz4 library was not found and fallback to builtin is disabled.");
])
])
+ AC_DEFINE_UNQUOTED(LZ4_H, [$lz4_header], [Location of lz4.h])
+
+ AM_CONDITIONAL([CONFIGURE_LZ4_BUILTIN], [test "x$lz4_builtin" = 'x1'])
+
])