Ben Ali Rachid <souliman...@yahoo.fr> writes:
> I have this link error : "undefined reference to 
> 'init_MultiFuncCall(FunctionCallInfoData*)'".

The fact that the linker knows the argument data type indicates that
you're trying to compile your code as C++.  Postgres is written in C,
not C++.

You can try putting extern "C" { ... } around your inclusions of
Postgres header files, but you're likely to run into other problems
later on.  On the whole I'd recommend using plain C for backend
functions if you possibly can.

                        regards, tom lane

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