I'm not sure if this should be posted here, on in development - it's a
programming question, but it's not an official part of LCNC. I'll start
here; if too arcane for this audience, feel free to suggest a re-direction.
I'm working on a user-space interface program for my Hurco mill control
panel, using a subset of the NML portion of halui, but getting data via
a modbus connection, rather than a hal environment.
After a >LONG< time (my C++ language skills are at the pidgin level), I
finally got the program to get through compilation, and banged into an
issue that has me baffled (don't speak makefiles so good either).
I defined the new program in the usr_intf submake file, rather than
creating a new subdirectory. I cloned the halui entries:
HALUISRCS := emc/usr_intf/halui.cc
becomes
MODBUSUISRCS := emc/usr_intf/modbusui.cc \
emc/usr_intf/modbus_rtu.c
#modbus_rtu is a modbus library that Arduino likes; so does linux
and
../bin/halui: $(call TOOBJS, $(HALUISRCS)) ../lib/liblinuxcnc.a
../lib/liblinuxcncini.so.0 ../lib/libnml.so.0 ../lib/liblinuxcnchal.so.0
$(ECHO) Linking $(notdir $@)
$(Q)$(CXX) $(LDFLAGS) -o $@ $(ULFLAGS) $^
TARGETS += ../bin/halui
becomes
../bin/modbusui: $(call TOOBJS, $(MODBUSUISRCS)) ../lib/liblinuxcnc.a
../lib/liblinuxcncini.so.0 ../lib/libnml.so.0
$(ECHO) Linking $(notdir $@)
$(Q)$(CXX) $(LDFLAGS) -o $@ $(ULFLAGS) $^
TARGETS += ../bin/modbusui
#this target doesn't need liblinuxcnchal
with these entries, both source files compile as expected, but in the
link stage, I get errors that the functions which are located in the
modbus_rtu object file can't be found; it's like the linker doesn't know
about the .o file (which it just compiled).
Other targets in the same directory use mixed C++ and C sources, so it
must be doable. Just to ensure that this is not due to invisible typos,
I copied the modbus_rtu source into the modbusui source, revised the
source list to modbusui only, and the compile/link process ran to
completion. I have to conclude that this is either something I can't see
in the makefile, or some missing incantation that needs to be added to
one of the source files.
Anybody have a clue what could cause this behavior?
Thanks as always
lloyd
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