Julian Foad writes:
> Jon Berndt wrote:
> > Is there a way to determine which methods/attributes in a class are unused
> > by anybody? I'm thinking maybe there's a utility out there somewhere or a
> > link directive. This would assist in code streamlining/cleanup.
>
>
> Getting the linker to tell you is an interesting idea that I haven't
> looked into. Perhaps you could do this manually by listing the public
> symbols in each library first, and then in the linked application, and
> comparing the two lists. Or perhaps you can make one list of all the
> exported symbols from the application and its libraries, and another
> list of all the imported symbols, and compare those. The unix utilities
> "nm" and "objdump" can list symbols in object files and libraries.
>
> I haven't come across a utility specifically for doing this, but I'd be
> interested.
This one got me thinking to :-)
I am not familiar enough with the internals of the ld to know how
todo this but this is EXACTLY the kind of thing that libbfd is for
% info bfd
ld can create a cross reference file that may be a good starting
point for doing this by hand.
The resulting cxref file lists all the functions sorted alphabetically
and all of the object files that they are referenced from
FGFCS::GetComponentName(int)
../../src/FDM/JSBSim/libJSBSim.a(FGFCS.o)
FGFCS::GetComponentOutput(int)
../../src/FDM/JSBSim/libJSBSim.a(FGFCS.o)
FGFCS::GetComponentStrings()
../../src/FDM/JSBSim/libJSBSim.a(FGFCS.o)
../../src/FDM/JSBSim/libJSBSim.a(FGOutput.o)
FGFCS::GetComponentValues()
../../src/FDM/JSBSim/libJSBSim.a(FGFCS.o)
../../src/FDM/JSBSim/libJSBSim.a(FGOutput.o)
FGFCS::GetDaCmd() const
../../src/FDM/JSBSim/libJSBSim.a(FGFCS.o)
add -Wl,--cref to $LDFLAGS in the src/Main/Makefile if you want to experiment
be warned this results in a large cxref file ~5 meg
Norman
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