On Sat, Feb 16, 2013 at 2:10 PM, lloyd wilson
<llwilso...@rochester.rr.com> wrote:
> MODBUSUISRCS := emc/usr_intf/modbusui.cc \
> emc/usr_intf/modbus_rtu.c
..
> 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).
I didn't try to figure out your overall layout, but in the interest of
getting the simple issues out of the way, are you declaring the C
functions properly in the C++ modules? Unlike C, C++ function cpfun
results in external symbol name decorated with typing information. For
instance, this code:
int cfun(int x){return x;}
when compiled with gcc -c t.c creates an object t.o which defines
function 'cfun'; when you compile it as C++ with 'g++ -c t.c' the
object contains the function symbol _Z4cfuni
In order to use C functions in C++ you have to declare them as extern
"C" int cfun(int x);
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