Add on to the dummy.cpp hack that forces wireshark to be linked with a

c++ compiler to automatically create a dummy.cpp file and remove it when
make clean is issued.  This allows make tags to work again since the
file isn't missing.

Change-Id: I17191ad2acc281734fa12da4d347fd3116018f67
Reviewed-on: https://code.wireshark.org/review/5494
Petri-Dish: Stephen Fisher <sfisher@sdf.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Stephen Fisher <sfisher@sdf.org>

.gitignore

@@ -209,6 +209,7 @@ ui/qt/config.pri
 *~
 .DS_Store
 cscope.*
+dummy.cpp
 tags
 TAGS
 macosx-support-libs

Makefile.am

@@ -452,6 +452,11 @@ endif
 nodist_EXTRA_wireshark_cxx_SOURCES = dummy.cpp
 wireshark_cxx_SOURCES =
 
+dummy.cpp:
+	echo 'static void dummy();' > $@
+# Generate the dummy.cpp for above so that "make tags" will still work.
+# ("make clean" will remove it.)
+
 if ENABLE_STATIC
 tshark_LDFLAGS = -Wl,-static -all-static
 else
@@ -691,6 +696,7 @@ services:
 CLEANFILES =		\
 	*~		\
 	doxygen-core.tag	\
+	dummy.cpp	\
 	vgcore.*
 
 #