> On 02/10/2013 15:11, Ruben J=F6nsson wrote:
> >> I would look for a warning about 'unused' something or other.
> >>
> >=20
> > Message 759 in XC8 - expression generates no code.
>=20
> Can you provide a test case that causes this message to be displayed?  I
> cannot, but I have only spent a few minutes trying.
>=20
> David

I also gave it a few minutes but I couldn't get the message displayed.=20

The full description for this message is:

This expression generates no output code. Check for things like leaving off=
 the=20
parentheses in a function call, for example:
int fred;
fred; /* this is valid, but has no effect at all */
Some devices require that special function register need to be read to clea=
r=20
hardware flags. To accommodate this, in some instances the code generator d=
oes=20
produce code for a statement which only consists of a variable ID. This may=
=20
happen for variables which are qualified as volatile. Typically the output =
code=20
will read the variable, but
not do anything with the value read.

And it gives the leaving out parentheses as one example. The chapter also=20
starts with the following text, so the message may not apply to the XC8=20
compiler:

This is the complete and historical message set covering all former HI-TECH=
 C=20
compilers and all compiler versions. Not all messages
shown here may be relevant for the compiler version you are using.

/Ruben

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124
200 39 Malm=F6 Sweden
Tel +46 40142078
ruben@rjjournal.net
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

--=20
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