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dnl Check for libusb
dnl Copyright (C) 2004, 2005 Free Software Foundation, Inc.
dnl
dnl This file is free software, distributed under the terms of the GNU
dnl General Public License. As a special exception to the GNU General
dnl Public License, this file may be distributed as part of a program
dnl that contains a configuration script generated by Autoconf, under
dnl the same distribution terms as the rest of that program.
dnl
dnl Defines HAVE_LIBUSB to 1 if a working libusb setup is found, and sets
dnl @LIBUSB@ to the necessary libraries. HAVE_USB_GET_BUSSES is set if
dnl usb_get_busses() exists.
AC_DEFUN([GNUPG_CHECK_LIBUSB],
[
AC_ARG_WITH(libusb,
AC_HELP_STRING([--with-libusb=DIR],
[look for the libusb library in DIR]),
[_do_libusb=$withval],[_do_libusb=yes])
if test "$_do_libusb" != "no" ; then
if test -d "$withval" ; then
CPPFLAGS="${CPPFLAGS} -I$withval/include"
LDFLAGS="${LDFLAGS} -L$withval/lib"
AC_PATH_PROG([_usb_config],["$_do_libusb/bin/libusb-config"])
else
AC_PATH_PROG([_usb_config],[libusb-config])
fi
_libusb_save_libs=$LIBS
_libusb_save_cflags=$CFLAGS
if test x$_usb_config != "x" ; then
_libusb_try_libs=`$LIBS $_usb_config --libs`
_libusb_try_cflags=`$LIBS $_usb_config --cflags`
else
_libusb_try_libs="-lusb"
_libusb_try_cflags=""
fi
LIBS="$LIBS $_libusb_try_libs"
CFLAGS="$CFLAGS $_libusb_try_cflags"
AC_MSG_CHECKING([whether libusb is present and sane])
AC_LINK_IFELSE(AC_LANG_PROGRAM([#include <usb.h>],[
usb_bulk_write(NULL,0,NULL,0,0);
]),_found_libusb=yes,_found_libusb=no)
AC_MSG_RESULT([$_found_libusb])
if test $_found_libusb = yes ; then
AC_DEFINE(HAVE_LIBUSB,1,
[Define to 1 if you have a fully functional libusb library.])
AC_SUBST(LIBUSB_CPPFLAGS,$_libusb_try_cflags)
AC_SUBST(LIBUSB,$_libusb_try_libs)
AC_CHECK_FUNCS(usb_get_busses)
fi
LIBS=$_libusb_save_libs
CFLAGS=$_libusb_save_cflags
unset _libusb_save_libs
unset _libusb_save_cflags
unset _libusb_try_libs
unset _libusb_try_cflags
unset _found_libusb
fi
])dnl
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