1 dnl Copyright 2003,2008,2009 Free Software Foundation, Inc.
3 dnl This file is part of GNU Radio
5 dnl GNU Radio is free software; you can redistribute it and/or modify
6 dnl it under the terms of the GNU General Public License as published by
7 dnl the Free Software Foundation; either version 3, or (at your option)
10 dnl GNU Radio is distributed in the hope that it will be useful,
11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 dnl GNU General Public License for more details.
15 dnl You should have received a copy of the GNU General Public License
16 dnl along with GNU Radio; see the file COPYING. If not, write to
17 dnl the Free Software Foundation, Inc., 51 Franklin Street,
18 dnl Boston, MA 02110-1301, USA.
21 # yes : check libusb-1.0
22 # no : check libusb-0.12
23 # "" : check libusb-0.12
26 AC_DEFUN([USRP_LIBUSB], [
27 dnl Use PKGCONFIG to check for packages first, then check to
28 dnl make sure the USB_* variables work (whether from PKGCONFIG
29 dnl or overridden by the user)
31 dnl do not use LDFLAGS, since PKGCONFIG will provide everything
32 saved_LDFLAGS=${LDFLAGS}
34 LIBUSB_PKG_CONFIG_NAME=
36 dnl loop over various possible 'libusb' PKGCONFIG names, and choose
37 dnl the first one that meets both the user's selection (via
38 dnl configure flags) as well as what is installed
40 dnl create the list of libusb PKGCONFIG modules to test
42 if test x$1 = xyes; then
43 dnl libusb-1.0 was requested; just test for it
44 libusb_list="libusb-1.0"
46 dnl test for legacy libusb only
47 libusb_list="libusb libusb-legacy"
49 for libusb_name in ${libusb_list}; do
50 dnl clear internal variables
58 AC_MSG_NOTICE([Checking for LIBUSB version '${libusb_name}'])
59 if test ${libusb_name} = "libusb-1.0"; then
60 dnl see if the pkgconfig module is available
61 PKG_CHECK_MODULES(USB, ${libusb_name}, [
64 usb_header='libusb-1.0/libusb.h'
65 usb_lib_func='libusb_bulk_transfer'
68 dnl see if the pkgconfig module is available
69 PKG_CHECK_MODULES(USB, ${libusb_name}, [
72 usb_lib_func='usb_bulk_write'
75 if test $libusbok = yes; then
76 dnl PKGCONFIG found a version of LIBUSB.
77 dnl Check it to make sure it meets enough criteria:
78 dnl Verify that $usb_header is a valid header. If so, then
79 dnl verify that $usb_lib_func can be found in the library
80 dnl $usb_lib_name. if so, verify that the symbol 'usb_debug' is
81 dnl found in the library.
83 dnl Check for the header. Similar to AC_CHECK_HEADERS,
84 dnl but doesn't append to known \#defines.
85 dnl If PKGCONFIG found variable USB_INCLUDEDIR, and it is
86 dnl not empty, use it for checking for $usb_header.
87 dnl Otherwise, maybe the user's shell environment is already
88 dnl configured to find this header.
90 save_CPPFLAGS="$CPPFLAGS"
91 if test x$USB_INCLUDEDIR != x; then
92 USB_INCLUDES="-I$USB_INCLUDEDIR"
93 CPPFLAGS="$USB_INCLUDES"
95 AC_MSG_CHECKING([$libusb_name for header $usb_header])
96 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
97 #include "$usb_header"
99 [libusbok=yes],[libusbok=no])
100 AC_MSG_RESULT([$libusbok])
101 CPPFLAGS="$save_CPPFLAGS"
104 if test $libusbok = yes; then
105 dnl found the header; now make sure the library is OK
106 dnl On Darwin, need to include the IOKit library.
112 USB_LIBS="$USB_LIBS -lIOKit"
118 dnl find the library link name
119 usb_lib_name=`echo $USB_LIBS | sed -e "s@.*-l\(usb[[^ ]]*\).*@\1@"`
121 dnl Check for the function in the library. Similar to
122 dnl AC_CHECK_LIB, but doesn't append to known \#defines.
123 AC_MSG_CHECKING([$libusb_name for function $usb_lib_func in library $usb_lib_name])
124 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
128 char $usb_lib_func ();
129 ]], [[return $usb_lib_func ();]])],
130 [libusbok=yes],[libusbok=no])
131 AC_MSG_RESULT([$libusbok])
141 if test $libusbok = yes; then
142 if test ${libusb_name} != "libusb-1.0"; then
143 dnl PKGCONFIG found a legacy version of libusb; make sure the
144 dnl variable _usb_debug is available in the found library
146 save_CPPFLAGS="$CPPFLAGS"
147 CPPFLAGS="$USB_INCLUDES"
150 AC_MSG_CHECKING([$libusb_name for symbol usb_debug in library $usb_lib_name])
151 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
152 extern int usb_debug;]],
153 [[usb_debug = 0;]])],
154 [libusbok=yes],[libusbok=no])
155 AC_MSG_RESULT([$libusbok])
157 CPPFLAGS="$save_CPPFLAGS"
163 dnl if everything checks out OK, finish up
164 if test $libusbok = yes; then
165 LIBUSB_PKG_CONFIG_NAME="${libusb_name}"
168 dnl something wasn't found in this LIBUSB version.
169 dnl HACK: clear cache variables for header and library
178 if test $libusbok = yes; then
179 dnl final error checking, mostly to create #define's
181 save_CPPFLAGS="$CPPFLAGS"
182 CPPFLAGS="$USB_INCLUDES"
183 dnl Check for the header.
184 AC_CHECK_HEADERS([$usb_header], [], [libusbok=no])
185 CPPFLAGS="$save_CPPFLAGS"
188 if test $libusbok = no; then
189 AC_MSG_RESULT([USRP requires libusb header '$usb_header' which was not found or was not usable. See http://www.libusb.org])
191 dnl check for the library (again)
193 save_CPPFLAGS="$CPPFLAGS"
194 CPPFLAGS="$USB_INCLUDES"
197 AC_CHECK_LIB([$usb_lib_name], [$usb_lib_func], [], [
199 AC_MSG_RESULT([USRP requires library '$usb_lib_name' with function '$usb_lib_func', which was either not found or was not usable. See http://www.libusb.org])])
201 CPPFLAGS="$save_CPPFLAGS"
206 if test $libusbok = yes; then
208 AC_MSG_NOTICE([Using LIBUSB version '${libusb_name}'])
209 ifelse([$2], , :, [$2])
211 dnl not found; clear substitution variables
212 LIBUSB_PKG_CONFIG_NAME=
215 ifelse([$3], , :, [$3])
218 dnl create substitution variables
219 AC_SUBST(USB_INCLUDES)
221 AC_SUBST(LIBUSB_PKG_CONFIG_NAME)
224 LDFLAGS=${saved_LDFLAGS}