.sym not being generated by -export-symbols in Makefile.am - build

Question

I am trying to build a shared library by editing Wireshark's Makefile.am to create a "libtshark" ... to do this, I am trying to build a tshark_lib.c which is the same as tshark.c with main() stripped out of it.
So I have edited Makefile.am to include include the following in an attempt to build the shared libtshark library:
lib_LTLIBRARIES = libtshark.la
libtshark_la_LDFLAGS = -version-info 0:1:0 -export-symbols libtshark.sym #LDFLAGS_SHAREDLIB#
libtshark_la_SOURCES = \
$(WIRESHARK_COMMON_SRC) \
$(SHARK_COMMON_CAPTURE_SRC) \
$(TSHARK_TAP_SRC) \
capture_opts.c \
capture_sync.c \
tempfile.c \
tshark-tap-register.c \
tshark_lib.c
# Libraries and plugin flags with which to link tshark.
libtshark_la_LIBADD = \
wiretap/libwiretap.la \
epan/libwireshark.la \
wsutil/libwsutil.la \
#SSL_LIBS# \
$(plugin_ldadd) \
#PCRE_LIBS# \
#GLIB_LIBS# -lm \
#PCAP_LIBS# \
#SOCKET_LIBS# \
#NSL_LIBS# \
#C_ARES_LIBS# \
#ADNS_LIBS# \
#KRB5_LIBS# \
#CORESERVICES_FRAMEWORKS# \
#LIBGCRYPT_LIBS# \
#LIBGNUTLS_LIBS# \
#LIBSMI_LDFLAGS#
#tshark_CFLAGS = $(AM_CLEAN_CFLAGS) $(py_dissectors_dir)
libtshark_la_DEPENDENCIES = \
${top_builddir}/epan/libwireshark.la \
${top_builddir}/wsutil/libwsutil.la \
${top_builddir}/wiretap/libwiretap.la \
libtshark.sym
However, when I try to build the code now, I get the following error:
make[2]: *** No rule to make target `libtshark.sym', needed by `libtshark.la'. Stop.
For some reason, it is not using my 'libtshark_la_LDFLAGS' which contains '-export-symbols libtshark.sym' ... does anyone know what I might be missing?
Here is the entire Makefile.am, which is too long for stackoverflow: Makefile.am

Answer 1

it turns out that the .sym file is pre-generated by wireshark scripts to determine which symbols to export.