[Dune] [#951] Fix warning: unused parameter

[Dune]

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The following task has a new comment added:

FS#951 - Fix warning: unused parameter
User who did this - Elias Pipping (pipping)

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-Wunused-parameter is implied by "-Wall -Wunused" and "-Wextra" but not plain "-Wall" (which is the autotools default).

The #pragma unused invocation is not too ugly and has the advantage of being ignored by any compiler that does not support it.

There is also __attribute__((unused)) but that's not only long and ugly, but also only supported by gcc I think.

One could also say that if doxygen is used with code that does not declare functions separately, unused variables cannot be avoided in a portable way, so that warnings about such should just be ignored/disabled.
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