m4_define(FULL_PAVER, esyscmd(/usr/bin/pkg-config --silence-errors --modversion pulsecore | tr -d \\n))
m4_define(PAVER, regexp(FULL_PAVER, [\([0123456789.]+\).*], [\1]))

AC_PREREQ(2.52)

AC_INIT([pulseaudio-modules-mfld-blackbay], [0.1])
AM_INIT_AUTOMAKE([-Wall -Werror foreign])
AC_CONFIG_HEADERS([config.h:config.h.in])

AC_CONFIG_MACRO_DIR([m4])

# this would not be really needed if everything would be as it should be
AS_IF([test x${exec_prefix} = xNONE], [LIBDIR=$ac_default_prefix/lib], [LIBDIR=${libdir}])
AC_SUBST(LIBDIR)

AC_SUBST(PA_MAJORMINOR, [PAVER])


# Checks for programs.
AC_PROG_CC
AC_C_CONST
dnl AC_FUNC_MALLOC
AC_FUNC_MMAP
AC_FUNC_REALLOC
AC_FUNC_SELECT_ARGTYPES
AC_FUNC_STAT
AC_FUNC_VPRINTF
AC_HEADER_STDBOOL
AC_HEADER_STDC
AC_HEADER_TIME
AC_PROG_GCC_TRADITIONAL
AC_PROG_LIBTOOL

# Checks for libraries.
AC_CANONICAL_HOST
AC_DEFINE_UNQUOTED([CANONICAL_HOST], "$host", [Canonical host string.])

AC_MSG_CHECKING([target operating system])

case $host in
        *-*-linux*)
            AC_MSG_RESULT([linux])
            pulse_target_os=linux
        ;;
        *)
            AC_MSG_RESULT([unknown])
            pulse_target_os=unknown
        ;;
esac

# If everything else fails use libatomic_ops
need_libatomic_ops=yes

AC_MSG_CHECKING([whether $CC knows __sync_bool_compare_and_swap()])
AC_LANG_CONFTEST([int main() { int a = 4; __sync_bool_compare_and_swap(&a, 4, 5); }])
$CC conftest.c $CFLAGS -o conftest > /dev/null 2> /dev/null
ret=$?
rm -f conftest.o conftest
if test $ret -eq 0 ; then
    AC_DEFINE([HAVE_ATOMIC_BUILTINS], 1, [Have __sync_bool_compare_and_swap() and friends.])
    AC_MSG_RESULT([yes])
    need_libatomic_ops=no
fi

AC_MSG_CHECKING([whether we need libatomic_ops])
if test "x$need_libatomic_ops" = "xyes"; then
   AC_MSG_RESULT([yes])
   AC_CHECK_HEADERS([atomic_ops.h], [], [
   AC_MSG_ERROR([*** libatomic-ops headers not found])
   ])

   # Win32 does not need the lib and breaks horribly if we try to include it
   if test "x$os_is_win32" != "x1" ; then
       LIBS="$LIBS -latomic_ops"
   fi
else
   AC_MSG_RESULT([no])
fi

#### libtool stuff ####
LT_PREREQ(2.2)
LT_INIT([dlopen win32-dll disable-static])

dnl Unfortunately, even up to libtool 2.2.6a there is no way to know
dnl exactly which version of libltdl is present in the system, so we
dnl just assume that it's a working version as long as we have the
dnl library and the header files.
dnl
dnl As an extra safety device, check for lt_dladvise_init() which is
dnl only implemented in libtool 2.x, and refine as we go if we have
dnl refined requirements.
dnl
dnl Check the header files first since the system may have a
dnl libltdl.so for runtime, but no headers, and we want to bail out as
dnl soon as possible.
dnl
dnl We don't need any special variable for this though, since the user
dnl can give the proper place to find libltdl through the standard
dnl variables like LDFLAGS and CPPFLAGS.

AC_CHECK_HEADER([ltdl.h],
    [AC_CHECK_LIB([ltdl], [lt_dladvise_init], [LIBLTDL=-lltdl], [LIBLTDL=])],
    [LIBLTDL=])

AS_IF([test "x$LIBLTDL" = "x"],
    [AC_MSG_ERROR([Unable to find libltdl version 2. Makes sure you have libtool 2.2 or later installed.])])
AC_SUBST([LIBLTDL])

PKG_CHECK_MODULES(PULSE, libpulse)
AC_SUBST(PULSE_CFLAGS)
AC_SUBST(PULSE_LIBS)

# module directory
AC_ARG_WITH([module-dir],
            [AS_HELP_STRING([--with-module-dir], [Directory where to install the modules to (defaults to ${LIBDIR}/pulse-${PA_MAJORMINOR}/modules/])],
            [modlibexecdir=$withval],
            [modlibexecdir=${LIBDIR}/pulse-${PA_MAJORMINOR}/modules]
)
AC_SUBST(modlibexecdir)

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([fcntl.h memory.h stdlib.h string.h sys/time.h unistd.h errno.h sys/types.h sys/stat.h])

# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_PID_T
AC_TYPE_SIZE_T

# Checks for library functions.
AC_FUNC_ALLOCA
AC_FUNC_FORK
AC_FUNC_MALLOC
AC_FUNC_MEMCMP
AC_FUNC_SELECT_ARGTYPES
AC_TYPE_SIGNAL
AC_CHECK_FUNCS([memset select])
AC_CONFIG_FILES([
Makefile
])
AC_OUTPUT