Rewrite make-{dissectors,taps} in Python

Having these build tools in machine code poses problems when cross-compiling.
The most significant being that we need to find the host and build GLiB
dependencies at compile-time.

There is no noticeable speed difference between the Python and C implementation.

Ping-Bug: 14622
Change-Id: Id13f823c7f4abf51edfa291e703028873748989f
Reviewed-on: https://code.wireshark.org/review/28130
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
(cherry picked from commit 722d6b06f606bc045ecef6fe5c8f2c700a3dad65)
 [Peter: adjusted autotools to use the new make-regs.py script]
Reviewed-on: https://code.wireshark.org/review/28204

.gitignore

@@ -48,8 +48,6 @@ plugins/codecs/*/plugin.c
 plugins/epan/mate/mate_parser.c
 version.h
 tools/lemon/lemon
-tools/make-dissectors
-tools/make-taps
 tshark-tap-register.c
 wiretap/ascend.c
 wiretap/ascend.h

CMakeLists.txt

@@ -1325,7 +1325,7 @@ add_subdirectory( doc )
 add_subdirectory( docbook EXCLUDE_FROM_ALL )
 add_subdirectory( epan )
 add_subdirectory( randpkt_core )
-add_subdirectory( tools )
+add_subdirectory( tools/lemon )
 add_subdirectory( ui )
 add_subdirectory( wiretap )
 add_subdirectory( writecap )

cmake/modules/UseMakeTaps.cmake

@@ -5,9 +5,9 @@ MACRO(REGISTER_TAP_FILES _outputfile)
         OUTPUT
           ${_outputfile}
         COMMAND
-          make-taps ${_outputfile} ${_sources}
+          ${PYTHON_EXECUTABLE} ${CMAKE_SOURCE_DIR}/tools/make-regs.py taps ${_outputfile} ${_sources}
         DEPENDS
-          make-taps
+          ${CMAKE_SOURCE_DIR}/tools/make-regs.py
           ${_sources}
         COMMENT
           "Making ${_outputfile}"

epan/dissectors/CMakeLists.txt

@@ -1892,8 +1892,8 @@ file(GENERATE
 )
 add_custom_command(
 	OUTPUT dissectors.c
-	COMMAND make-dissectors dissectors.c @dissectors.in.txt
-	DEPENDS make-dissectors ${ALL_DISSECTOR_SRC}
+	COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_SOURCE_DIR}/tools/make-regs.py dissectors dissectors.c @dissectors.in.txt
+	DEPENDS ${CMAKE_SOURCE_DIR}/tools/make-regs.py ${ALL_DISSECTOR_SRC}
 		"${CMAKE_CURRENT_BINARY_DIR}/dissectors.in.txt"
 	COMMENT "Making dissectors.c"
 )

epan/dissectors/Makefile.am

@@ -1957,10 +1957,10 @@ x11-dissector: $(top_srcdir)/tools/process-x11-fields.pl $(srcdir)/x11-fields $(
 # We pass the arguments to make-dissectors in a file to avoid limitations
 # with the number of arguments handled by main().
 #
-dissectors.c: $(top_builddir)/tools/make-dissectors $(ALL_DISSECTORS_SRC)
+dissectors.c: $(top_srcdir)/tools/make-regs.py $(ALL_DISSECTORS_SRC)
 	@echo Making dissectors.c
 	@echo $^ | tr ' ' '\n' | $(GREP) '\.c$$' > dissectors.in.txt && \
-	    $(top_builddir)/tools/make-dissectors $@ @dissectors.in.txt
+	    $(PYTHON) $(top_srcdir)/tools/make-regs.py dissectors $@ @dissectors.in.txt
 
 MOSTLYCLEANFILES = \
 	dissectors.in.txt

tools/Makefile.am

@@ -23,22 +23,6 @@ include $(top_srcdir)/Makefile.am.inc
 
 SUBDIRS = lemon
 
-CC = $(CC_FOR_BUILD)
-CPPFLAGS = $(CPPFLAGS_FOR_BUILD)
-CFLAGS = $(CFLAGS_FOR_BUILD)
-LDFLAGS = $(LDFLAGS_FOR_BUILD)
-LIBS =
-
-noinst_PROGRAMS = make-taps make-dissectors
-
-make_dissectors_CFLAGS = $(GLIB_CFLAGS)
-
-make_dissectors_LDADD = $(GLIB_LIBS)
-
-make_taps_CFLAGS = $(GLIB_CFLAGS)
-
-make_taps_LDADD = $(GLIB_LIBS)
-
 EXTRA_DIST = \
 	asn2deb						\
 	asn2wrs.py					\