augmented search for libusb

[debian/gnuradio] / config / usrp_libusb.m4

diff --git a/config/usrp_libusb.m4 b/config/usrp_libusb.m4
index cb3130c8730d953e0eafe4880e7782db5a360e49..6666eaedf747a177761da1a92b82c642092a9854 100644 (file)
--- a/config/usrp_libusb.m4
+++ b/config/usrp_libusb.m4
@@ -1,4 +1,4 @@
-dnl Copyright 2003,2008 Free Software Foundation, Inc.
+dnl Copyright 2003,2008,2009 Free Software Foundation, Inc.
 dnl 
 dnl This file is part of GNU Radio
 dnl 
@@ -17,32 +17,96 @@ 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.
 
-AC_DEFUN([USRP_LIBUSB], [
-    libusbok=yes
-    PKG_CHECK_MODULES(USB, libusb, [], [
-        AC_LANG_PUSH(C)
+# $1 is $req_libusb1:
+#   yes : check libusb-1.0
+#   no  : check libusb-0.12
+#   ""  : check libusb-0.12
 
-       AC_CHECK_HEADERS([usb.h], [], [libusbok=no; AC_MSG_RESULT([USRP requires libusb. usb.h not found. See http://libusb.sf.net])])
 
-       save_LIBS="$LIBS"
-       case "$host_os" in
-         darwin*)
-           LIBS="$LIBS -lIOKit"
-            ;;
-         *) ;;
-        esac
+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)
 
-       AC_SEARCH_LIBS(usb_bulk_write, [usb], [USB_LIBS="$LIBS"], [libusbok=no; AC_MSG_RESULT([USRP requires libusb. usb_bulk_write not found. See http://libusb.sf.net])])
+  libusbok=no
+  have_libusb1=no
+  if test x$1 = xyes; then
+    PKG_CHECK_MODULES(USB, libusb-1.0, [
+      libusbok=yes
+      have_libusb1=yes
+      usb_header='libusb-1.0/libusb.h'
+      usb_lib_func='libusb_bulk_transfer'
+      usb_lib_name='usb-1.0'
+    ])
+  fi
+  if test $libusbok = no; then
+    dnl not using libusb1, or PKGCONFIG check for libusb1 failed;
+    dnl see if legacy version is found.
+    dnl it might be installed under the name either 'libusb' or
+    dnl 'libusb-legacy'. check them in that order.
+
+    dnl see if the pkgconfig module 'libusb' is available
+    PKG_CHECK_MODULES(USB, libusb, [libusbok=yes], [libusbok=no])
+    dnl PKG_CHECK_MODULES does not work correctly when embedded
+    if test $libusbok = no; then
+      dnl if not, see if the pkgconfig module 'libusb-legacy' is available
+      PKG_CHECK_MODULES(USB, [libusb-legacy], [libusbok=yes], [libusbok=no])
+    fi
+    if test $libusbok = yes; then
+      dnl if PKGCONFIG worked, set variables for further testing
+      usb_header='usb.h'
+      usb_lib_func='usb_bulk_write'
+      usb_lib_name='usb'
+    fi
+  fi
+  if test $libusbok = no; then
+    AC_MSG_RESULT([USRP requires libusb, which was not found. See http://www.libusb.org])
+  else
 
-        LIBS="$save_LIBS"
+    dnl either some pkgconfig LIBUSB* variant was found, or USB_*
+    dnl variables were overridden by the user as arguments to configure.
+    dnl either way, check the USB_* variables to make sure they work
 
-        AC_LANG_POP
-    ])
+    AC_LANG_PUSH(C)
+    save_CPPFLAGS="$CPPFLAGS"
+    if test x$USB_INCLUDEDIR != x; then
+      USB_INCLUDES="-I$USB_INCLUDEDIR"
+      CPPFLAGS="$CPPFLAGS $USB_INCLUDES"
+      AC_SUBST(USB_INCLUDES)
+    fi
+    AC_CHECK_HEADERS([$usb_header], [], [libusbok=no])
+    CPPFLAGS="$save_CPPFLAGS"
+    AC_LANG_POP(C)
 
-    if test x$libusbok = xyes; then
-        AC_SUBST(USB_LIBS)
-       ifelse([$1], , :, [$1])
+    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
-        ifelse([$2], , :, [$2])
+
+      dnl found the header; now make sure the library is OK
+
+      AC_LANG_PUSH(C)
+      save_LIBS="$LIBS"
+      case "$host_os" in
+        darwin*)
+          USB_LIBS="$USB_LIBS -lIOKit"
+          ;;
+        *) ;;
+      esac
+      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 '$usb_lib_func', which was either not found or was not usable. See http://www.libusb.org])
+      ])
+      LIBS="$save_LIBS"
+      AC_LANG_POP(C)
     fi
+  fi
+  if test $libusbok = yes; then
+    AC_SUBST(USB_LIBS)
+    ifelse([$2], , :, [$2])
+  else
+    USB_INCLUDES=
+    USB_LIBS=
+    ifelse([$3], , :, [$3])
+  fi
 ])