build: modernize configure.ac

Replace deprecated macros with recommended counterparts. Require a more
recent autoconf version. Add missing brackets.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/configure.ac b/configure.ac
index 84a801c4204af41566d542abdec2fca7342ea7c4..0301e1225403ad78723f88ca8736087258853d5c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -6,9 +6,9 @@
 # Copyright (C) 2017-2019 Bartosz Golaszewski <bartekgola@gmail.com>
 #
 
-AC_PREREQ(2.61)
+AC_PREREQ([2.69])
 
-AC_INIT([libgpiod], 2.0)
+AC_INIT([libgpiod],[2.0])
 AC_SUBST(EXTRA_VERSION, [-devel])
 
 AC_DEFINE_UNQUOTED([GPIOD_VERSION_STR],
@@ -61,9 +61,10 @@ AC_SUBST(AR_FLAGS, [cr])
 AM_PROG_AR
 AC_PROG_CC
 AC_PROG_CXX
-AC_PROG_LIBTOOL
 AC_PROG_INSTALL
 
+LT_INIT
+
 AC_DEFUN([ERR_NOT_FOUND],
        [AC_MSG_ERROR([$1 not found (needed to build $2)], [1])])
 
@@ -104,8 +105,7 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE(
 [], [AC_MSG_ERROR(["libgpiod needs linux headers version >= v5.5.0"])])
 
 AC_ARG_ENABLE([tools],
-       [AC_HELP_STRING([--enable-tools],
-               [enable libgpiod command-line tools [default=no]])],
+       [AS_HELP_STRING([--enable-tools],[enable libgpiod command-line tools [default=no]])],
        [if test "x$enableval" = xyes; then with_tools=true; fi],
        [with_tools=false])
 AM_CONDITIONAL([WITH_TOOLS], [test "x$with_tools" = xtrue])
@@ -127,8 +127,7 @@ then
 fi
 
 AC_ARG_ENABLE([tests],
-       [AC_HELP_STRING([--enable-tests],
-               [enable libgpiod tests [default=no]])],
+       [AS_HELP_STRING([--enable-tests],[enable libgpiod tests [default=no]])],
        [if test "x$enableval" = xyes; then with_tests=true; fi],
        [with_tests=false])
 AM_CONDITIONAL([WITH_TESTS], [test "x$with_tests" = xtrue])
@@ -157,8 +156,7 @@ then
 fi
 
 AC_ARG_ENABLE([bindings-cxx],
-       [AC_HELP_STRING([--enable-bindings-cxx],
-               [enable C++ bindings [default=no]])],
+       [AS_HELP_STRING([--enable-bindings-cxx],[enable C++ bindings [default=no]])],
        [if test "x$enableval" = xyes; then with_bindings_cxx=true; fi],
        [with_bindings_cxx=false])
 AM_CONDITIONAL([WITH_BINDINGS_CXX], [test "x$with_bindings_cxx" = xtrue])
@@ -180,8 +178,7 @@ then
 fi
 
 AC_ARG_ENABLE([bindings-python],
-       [AC_HELP_STRING([--enable-bindings-python],
-               [enable python3 bindings [default=no]])],
+       [AS_HELP_STRING([--enable-bindings-python],[enable python3 bindings [default=no]])],
        [if test "x$enableval" = xyes; then with_bindings_python=true; fi],
        [with_bindings_python=false])
 AM_CONDITIONAL([WITH_BINDINGS_PYTHON], [test "x$with_bindings_python" = xtrue])