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dnl Check for LIBUSB compiler flags. On success, set nut_have_libusb="yes"
dnl and set LIBUSB_CFLAGS and LIBUSB_LDFLAGS. On failure, set
dnl nut_have_libusb="no". This macro can be run multiple times, but will
dnl do the checking only once.
AC_DEFUN([NUT_CHECK_LIBUSB],
[
if test -z "${nut_have_libusb_seen}"; then
nut_have_libusb_seen=yes
dnl save CFLAGS and LDFLAGS
CFLAGS_ORIG="${CFLAGS}"
LDFLAGS_ORIG="${LDFLAGS}"
AC_MSG_CHECKING(for libusb version via pkg-config)
LIBUSB_VERSION=`pkg-config --silence-errors --modversion libusb`
if test "$?" = "0"; then
AC_MSG_RESULT(${LIBUSB_VERSION} found)
CFLAGS="`pkg-config --silence-errors --cflags libusb`"
LDFLAGS="`pkg-config --silence-errors --libs libusb`"
else
AC_MSG_CHECKING(via libusb-config)
LIBUSB_VERSION=`libusb-config --version 2>/dev/null`
if test "$?" = "0"; then
AC_MSG_RESULT(${LIBUSB_VERSION} found)
CFLAGS="`libusb-config --cflags 2>/dev/null`"
LDFLAGS="`libusb-config --libs 2>/dev/null`"
else
AC_MSG_RESULT(not found)
CFLAGS=""
LDFLAGS="-lusb"
fi
fi
AC_MSG_CHECKING(for libusb cflags)
AC_ARG_WITH(usb-includes, [
AC_HELP_STRING([--with-usb-includes=CFLAGS], [include flags for the libusb library])
], [CFLAGS="${withval}"], [])
AC_MSG_RESULT([${CFLAGS}])
AC_MSG_CHECKING(for libusb ldflags)
AC_ARG_WITH(usb-libs, [
AC_HELP_STRING([--with-usb-libs=LDFLAGS], [linker flags for the libusb library])
], [LDFLAGS="${withval}"], [])
AC_MSG_RESULT([${LDFLAGS}])
dnl check if libusb is usable
AC_CHECK_HEADERS(usb.h, [nut_have_libusb=yes], [nut_have_libusb=no], [AC_INCLUDES_DEFAULT])
AC_CHECK_FUNCS(usb_init, [], [nut_have_libusb=no])
if test "${nut_have_libusb}" = "yes"; then
dnl Check for libusb "force driver unbind" availability
AC_CHECK_FUNCS(usb_detach_kernel_driver_np)
LIBUSB_CFLAGS="${CFLAGS}"
LIBUSB_LDFLAGS="${LDFLAGS}"
fi
dnl restore original CFLAGS and LDFLAGS
CFLAGS="${CFLAGS_ORIG}"
LDFLAGS="${LDFLAGS_ORIG}"
fi
])
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