Add Null POSIX backend
Add a simple null backend for POSIX platforms that reports no available
devices, and provides no capabilities. Make use of this new backend on
all the OSes without an existing backend, so libusb can be built even on
OSes without USB support.
diff --git a/configure.ac b/configure.ac
index da8a158..ddde325 100644
--- a/configure.ac
+++ b/configure.ac
@@ -100,7 +100,9 @@
threads=posix
;;
*)
- AC_MSG_ERROR([unsupported operating system $host])
+ AC_MSG_RESULT([Null])
+ backend="null"
+ threads="posix"
esac
case $backend in
@@ -186,6 +188,14 @@
AC_CHECK_HEADERS([poll.h])
AC_DEFINE([POLL_NFDS_TYPE],[nfds_t],[type of second poll() argument])
;;
+null)
+ AC_DEFINE(OS_NULL, 1, [Null backend])
+ AC_SUBST(OS_NULL)
+ THREAD_CFLAGS="-pthread"
+ LIBS="-pthread"
+ AC_CHECK_HEADERS([poll.h])
+ AC_DEFINE([POLL_NFDS_TYPE],[nfds_t],[type of second poll() argument])
+ ;;
esac
AC_SUBST(LIBS)
@@ -197,6 +207,7 @@
AM_CONDITIONAL(OS_NETBSD, test "x$backend" = xnetbsd)
AM_CONDITIONAL(OS_WINDOWS, test "x$backend" = xwindows)
AM_CONDITIONAL(OS_HAIKU, test "x$backend" = xhaiku)
+AM_CONDITIONAL(OS_NULL, test "x$backend" = xnull)
AM_CONDITIONAL(THREADS_POSIX, test "x$threads" = xposix)
AM_CONDITIONAL(CREATE_IMPORT_LIB, test "x$create_import_lib" = xyes)
AM_CONDITIONAL(USE_UDEV, test "x$enable_udev" = xyes)
