Hi,
this is a question for the gnu linker geek:
I am trying to add gnucap to FlightGear as posted before. It compiles cleanly
and links fine, but there is one issue. Gnucap uses commands which are
implemented in separate files. These commands get registered into a global
command registry. Here is a code snipped for the "clear" command:
class CMD_CLEAR : public CMD {
public:
void do_it(CS&, CARD_LIST* Scope) {
// .. do something fancy here
}
} p0;
DISPATCHER<CMD>::INSTALL d0(&command_dispatcher, "clear", &p0);
The class CMD_CLEAR implements the CMD interface which requires the do_it()
function.
The DISPATCHER template contains a INSTALL class, it's constructor performs
the registration into the registry. In theory, when the INSTALL class is
instantiated as d0, the actions in the constructor are performed.
Unfortunately, this does not happen when linked against FlightGear.
I tried to rename d0 into something more uniqe and grep'ed the created object
and library for the variable which were found there, but not in the fgfs
executable. This lead me to the conclusion, that the linker optimizes the
unused variable from the executable.
Is there any magic switch to pass to the g++ linker telling him not to
optimize unused variables, preferably for a certain set of files or a single
library?
Torsten
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