Darwin: Fix #63 error when apps use Objective-C garbage collection
diff --git a/configure.ac b/configure.ac
index bf2875e..e21e4dd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -59,6 +59,7 @@
AC_MSG_RESULT([Darwin/Mac OS X])
backend="darwin"
threads="posix"
+ LIBS="${LIBS} -lobjc"
PC_LIBS_PRIVATE="-Wl,-framework,IOKit -Wl,-framework,CoreFoundation"
LTLDFLAGS="${LTLDFLAGS} -Wl,-prebind"
AC_CHECK_HEADERS([poll.h])
diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c
index 7927b3a..912b65c 100644
--- a/libusb/os/darwin_usb.c
+++ b/libusb/os/darwin_usb.c
@@ -34,8 +34,13 @@
#include <mach/clock.h>
#include <mach/clock_types.h>
#include <mach/mach_host.h>
-
#include <mach/mach_port.h>
+
+#include <AvailabilityMacros.h>
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
+ #include <objc/objc-auto.h>
+#endif
+
#include <IOKit/IOCFBundle.h>
#include <IOKit/usb/IOUSBLib.h>
#include <IOKit/IOCFPlugIn.h>
@@ -264,6 +269,14 @@
struct libusb_context *ctx = (struct libusb_context *)arg0;
CFRunLoopRef runloop;
+ /* Tell the Objective-C garbage collector about this thread.
+ This is required because, unlike NSThreads, pthreads are
+ not automatically registered. Although we don't use
+ Objective-C, we use CoreFoundation, which does. */
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
+ objc_registerThreadWithCollector();
+#endif
+
/* hotplug (device removal) source */
CFRunLoopSourceRef libusb_notification_cfsource;
io_notification_port_t libusb_notification_port;
