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The attribute unused can be used to indicate if a variable or
parameter is unused and no warning should be emitted for it.
Furthermore this commit simplifies the check by adding a generic
function to traverse the program.
Bug 19872
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The unused variable check now uses two passes. One to collect the
used variables and one to report the unused variables.
Futhermore attribute checks are extended to composite declaration.
Also the check is now performed after elaboration.
Bug 19872
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The test now also checks whether the parameter are used at all in
the function body.
Bug 19872
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The check test whether the identifier is used at all in the
function and if not issue a warning. It is not tested whether the
usage is reachable at all, so
int i;
if (0)
i;
would not generate a warning. This is the same as gcc/clang does.
The warning is disabled per default, but is active if -Wall is
given.
Bug 19872
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There should not be a single check place, since for example
unknonw attributes should be check after elaboration and other
simplifications.
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The new module adds a function which is called during parse after
all C transformation have taken place for adding additional
checks. Currently only unknown attribute are checked.
Bug 19872
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