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dnl Copyright 2003,2008,2009 Free Software Foundation, Inc.
dnl
dnl This file is part of GNU Radio
dnl
dnl GNU Radio is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3, or (at your option)
dnl any later version.
dnl
dnl GNU Radio is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with GNU Radio; see the file COPYING. If not, write to
dnl the Free Software Foundation, Inc., 51 Franklin Street,
dnl Boston, MA 02110-1301, USA.
# $1 is $req_libusb1:
# yes : check libusb-1.0
# no : check libusb-0.12
# "" : check libusb-0.12
AC_DEFUN([USRP_LIBUSB], [
dnl Use PKGCONFIG to check for packages first, then check to
dnl make sure the USB_* variables work (whether from PKGCONFIG
dnl or overridden by the user)
dnl do not use LDFLAGS, since PKGCONFIG will provide everything
saved_LDFLAGS=${LDFLAGS}
LDFLAGS=
LIBUSB_PKG_CONFIG_NAME=
dnl loop over various possible 'libusb' PKGCONFIG names, and choose
dnl the first one that meets both the user's selection (via
dnl configure flags) as well as what is installed
dnl create the list of libusb PKGCONFIG modules to test
libusb_list=''
if test x$1 = xyes; then
dnl libusb-1.0 was requested; just test for it
libusb_list="libusb-1.0"
else
dnl test for legacy libusb only
libusb_list="libusb libusb-legacy"
fi
for libusb_name in ${libusb_list}; do
dnl clear internal variables
libusbok=no
have_libusb1=no
usb_header=''
usb_lib_func=''
usb_lib_name=''
dnl start checks
AC_MSG_NOTICE([Checking for LIBUSB version '${libusb_name}'])
if test ${libusb_name} = "libusb-1.0"; then
dnl see if the pkgconfig module is available
PKG_CHECK_MODULES(USB, ${libusb_name}, [
libusbok=yes
have_libusb1=yes
usb_header='libusb-1.0/libusb.h'
usb_lib_func='libusb_bulk_transfer'
], [libusbok=no])
else
dnl see if the pkgconfig module is available
PKG_CHECK_MODULES(USB, ${libusb_name}, [
libusbok=yes
usb_header='usb.h'
usb_lib_func='usb_bulk_write'
], [libusbok=no])
fi
if test $libusbok = yes; then
dnl PKGCONFIG found a version of LIBUSB.
dnl Check it to make sure it meets enough criteria:
dnl Verify that $usb_header is a valid header. If so, then
dnl verify that $usb_lib_func can be found in the library
dnl $usb_lib_name. if so, verify that the symbol 'usb_debug' is
dnl found in the library.
dnl Check for the header. Similar to AC_CHECK_HEADERS,
dnl but doesn't append to known \#defines.
dnl If PKGCONFIG found variable USB_INCLUDEDIR, and it is
dnl not empty, use it for checking for $usb_header.
dnl Otherwise, maybe the user's shell environment is already
dnl configured to find this header.
AC_LANG_PUSH(C)
save_CPPFLAGS="$CPPFLAGS"
if test x$USB_INCLUDEDIR != x; then
USB_INCLUDES="-I$USB_INCLUDEDIR"
CPPFLAGS="$USB_INCLUDES"
fi
AC_MSG_CHECKING([$libusb_name for header $usb_header])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include "$usb_header"
]], [])],
[libusbok=yes],[libusbok=no])
AC_MSG_RESULT([$libusbok])
CPPFLAGS="$save_CPPFLAGS"
AC_LANG_POP(C)
if test $libusbok = yes; then
dnl found the header; now make sure the library is OK
dnl On Darwin, need to include the IOKit library.
AC_LANG_PUSH(C)
save_LIBS="$LIBS"
case "$host_os" in
darwin*)
USB_LIBS="$USB_LIBS -lIOKit"
;;
*) ;;
esac
LIBS="$USB_LIBS"
dnl find the library link name
usb_lib_name=`echo $USB_LIBS | sed -e "s@.*-l\(usb[[^ ]]*\).*@\1@"`
dnl Check for the function in the library. Similar to
dnl AC_CHECK_LIB, but doesn't append to known \#defines.
AC_MSG_CHECKING([$libusb_name for function $usb_lib_func in library $usb_lib_name])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#ifdef __cplusplus
extern "C"
#endif
char $usb_lib_func ();
]], [[return $usb_lib_func ();]])],
[libusbok=yes],[libusbok=no])
AC_MSG_RESULT([$libusbok])
LIBS="$save_LIBS"
AC_LANG_POP(C)
if test $libusbok = yes; then
if test ${libusb_name} != "libusb-1.0"; then
dnl PKGCONFIG found a legacy version of libusb; make sure the
dnl variable _usb_debug is available in the found library
AC_LANG_PUSH(C)
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$USB_INCLUDES"
save_LIBS="$LIBS"
LIBS="$USB_LIBS"
AC_MSG_CHECKING([$libusb_name for symbol usb_debug in library $usb_lib_name])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
extern int usb_debug;]],
[[usb_debug = 0;]])],
[libusbok=yes],[libusbok=no])
AC_MSG_RESULT([$libusbok])
LIBS="$save_LIBS"
CPPFLAGS="$save_CPPFLAGS"
AC_LANG_POP(C)
fi
fi
fi
fi
dnl if everything checks out OK, finish up
if test $libusbok = yes; then
LIBUSB_PKG_CONFIG_NAME="${libusb_name}"
break
else
dnl something wasn't found in this LIBUSB version.
dnl HACK: clear cache variables for header and library
unset USB_INCLUDEDIR
unset USB_INCLUDES
unset USB_LIBS
unset $as_ac_Header
unset $as_ac_Lib
fi
done
if test $libusbok = yes; then
dnl final error checking, mostly to create #define's
AC_LANG_PUSH(C)
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$USB_INCLUDES"
dnl Check for the header.
AC_CHECK_HEADERS([$usb_header], [], [libusbok=no])
CPPFLAGS="$save_CPPFLAGS"
AC_LANG_POP(C)
if test $libusbok = no; then
AC_MSG_RESULT([USRP requires libusb header '$usb_header' which was not found or was not usable. See http://www.libusb.org])
else
dnl check for the library (again)
AC_LANG_PUSH(C)
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$USB_INCLUDES"
save_LIBS="$LIBS"
LIBS="$USB_LIBS"
AC_CHECK_LIB([$usb_lib_name], [$usb_lib_func], [], [
libusbok=no
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])])
case "$host_os" in
cygwin* | mingw*)
USB_LIBS="$LIBS"
;;
*) ;;
esac
LIBS="$save_LIBS"
CPPFLAGS="$save_CPPFLAGS"
AC_LANG_POP(C)
fi
fi
if test $libusbok = yes; then
dnl success
AC_MSG_NOTICE([Using LIBUSB version '${libusb_name}'])
ifelse([$2], , :, [$2])
else
dnl not found; clear substitution variables
LIBUSB_PKG_CONFIG_NAME=
USB_INCLUDES=
USB_LIBS=
ifelse([$3], , :, [$3])
fi
dnl create substitution variables
AC_SUBST(USB_INCLUDES)
AC_SUBST(USB_LIBS)
AC_SUBST(LIBUSB_PKG_CONFIG_NAME)
dnl restore LDFLAGS
LDFLAGS=${saved_LDFLAGS}
])
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