why are "references" restricted to symbols for which we have definitions?

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From man page for global:

-r, --reference, --rootdir
              Print  reference tags.  Reference means the reference to a
symbol which has definitions.  With the -p option, print the root directory
of
              the project.

I have  a use case where I want to know all function/method calls in my
large source tree. I don't have all functions defined, but I would like to
still know/find these symbols.

Is this possible? I have read that C++ parser seems to be on way to
deprecation (!!), are there other means possible to seek out even undefined
references?

Thanks.

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<div dir=3D"auto"><div class=3D"gmail_quote" dir=3D"auto"><div dir=3D"ltr" =
class=3D"gmail_attr"><br></div>From man page for global:<br>
<br>
-r, --reference, --rootdir<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Print=C2=A0 reference tags=
.=C2=A0 Reference means the reference to a symbol which has definitions.=C2=
=A0 With the -p option, print the root directory of<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the project.<br>
<br>
I have=C2=A0 a use case where I want to know all function/method calls in m=
y large source tree. I don&#39;t have all functions defined, but I would li=
ke to still know/find these symbols.<br>
<br>
Is this possible? I have read that C++ parser seems to be on way to depreca=
tion (!!), are there other means possible to seek out even undefined refere=
nces?<br>
<br>
Thanks.<br>
<br>
<br>
</div></div>

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