udev: disable for non Linux systems

On FreeBSD udev, the function udev_device_new_from_subsystem_sysname
exists but is not implemented.
As such it breaks our device initialisation detection.

Disabled by default, but can be enabled with ./configure --with-udev

diff --git a/configure b/configure
index 87fb6b2519971c9accf778f557c27a79252473ba..8398ad6918e72d5df64b4c67bbafce505bcbb5f7 100755 (executable)
--- a/configure
+++ b/configure
@@ -1529,15 +1529,31 @@ if [ -z "$INET6" ] || [ "$INET6" = yes ] || \
        fi
 fi
 
-if [ "$DEV" != no -a "$UDEV" != no ]; then
+if [ "$DEV" != no ] && [ "$UDEV" != no ]; then
        printf "Checking for libudev ... "
        if type "$PKG_CONFIG" >/dev/null 2>&1; then
                LIBUDEV_CFLAGS=$("$PKG_CONFIG" --cflags libudev 2>&3)
                LIBUDEV_LIBS=$("$PKG_CONFIG" --libs libudev 2>&3)
        fi
+       if [ -n "$LIBUDEV_LIBS" ] && [ "$UDEV" = yes ]; then
+               echo "yes"
+       elif [ -n "$LIBUDEV_LIBS" ]; then
+               case "$OS" in
+               linux*) echo "yes";;
+               *)      echo "yes (disabled)"
+                       # FreeBSD libudev fails to return a udev device
+                       # with udev_device_new_from_subsystem_sysname
+                       # which breaks our test for device initialisation
+                       LIBUDEV_CFLAGS=
+                       LIBUDEV_LIBS=
+                       ;;
+               esac
+       else
+               echo "no"
+       fi
 fi
-if [ "$DEV" != no -a "$UDEV" != no -a -n "$LIBUDEV_LIBS" ]; then
-       echo "yes"
+
+if [ "$DEV" != no ] && [ "$UDEV" != no ] && [ -n "$LIBUDEV_LIBS" ]; then
        [ -z "$DEV" ] && DEV=yes
        echo "DEV_PLUGINS+=     udev" >>$CONFIG_MK
        if [ -n "$LIBUDEV_CFLAGS" ]; then
@@ -1580,12 +1596,9 @@ EOF
                echo "no"
        fi
        rm -f _udev.c _udev
-elif [ "$DEV" != no -a "$UDEV" != no ]; then
-       echo "no"
-       if [ -n "$UDEV" ]; then
-               echo "udev has been explicitly requested ... aborting" >&2
-               exit 1
-       fi
+elif [ "$DEV" != no ] && [ "$UDEV" != no ] && [ -n "$UDEV" ]; then
+       echo "udev has been explicitly requested ... aborting" >&2
+       exit 1
 fi
 
 if [ "$DEV" = yes ]; then