compat/fsmonitor/fsm-listen-darwin: stub in backend for Darwin

Stub in empty implementation of fsmonitor--daemon
backend for Darwin (aka MacOS).

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

compat/fsmonitor/fsm-listen-darwin.c

@@ -0,0 +1,20 @@
+#include "cache.h"
+#include "fsmonitor.h"
+#include "fsm-listen.h"
+
+int fsm_listen__ctor(struct fsmonitor_daemon_state *state)
+{
+	return -1;
+}
+
+void fsm_listen__dtor(struct fsmonitor_daemon_state *state)
+{
+}
+
+void fsm_listen__stop_async(struct fsmonitor_daemon_state *state)
+{
+}
+
+void fsm_listen__loop(struct fsmonitor_daemon_state *state)
+{
+}

config.mak.uname

@@ -157,6 +157,16 @@ ifeq ($(uname_S),Darwin)
 			MSGFMT = /usr/local/opt/gettext/bin/msgfmt
 		endif
 	endif
+
+	# The builtin FSMonitor on MacOS builds upon Simple-IPC.  Both require
+	# Unix domain sockets and PThreads.
+	ifndef NO_PTHREADS
+	ifndef NO_UNIX_SOCKETS
+	FSMONITOR_DAEMON_BACKEND = darwin
+	endif
+	endif
+
+	BASIC_LDFLAGS += -framework CoreServices
 endif
 ifeq ($(uname_S),SunOS)
 	NEEDS_SOCKET = YesPlease

contrib/buildsystems/CMakeLists.txt

@@ -289,6 +289,9 @@ if(SUPPORTS_SIMPLE_IPC)
 	if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
 		add_compile_definitions(HAVE_FSMONITOR_DAEMON_BACKEND)
 		list(APPEND compat_SOURCES compat/fsmonitor/fsm-listen-win32.c)
+	elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+		add_compile_definitions(HAVE_FSMONITOR_DAEMON_BACKEND)
+		list(APPEND compat_SOURCES compat/fsmonitor/fsm-listen-darwin.c)
 	endif()
 endif()