Thanks for the reply - I discovered that yesterday by perusing an
include file from another C program linked with C++ -
hadn't had time to post reply.
On 02/18/2013 05:45 PM, Przemek Klosowski wrote:
> 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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