[rrd-developers] Warnings at compile time

[Alex van den Bogaerdt]

Hi everybody,

When building rrdtool I get a lot of warnings.  I've tracked most
of them:

- Three warnings in cgilib have to do with missing and/or incorrect
  function prototypes; I already contacted the author to see if this
  can be solved without causing problems elsewhere
- A zillion warnings are a result of global variables y0,y1 and gamma
  defined while including <math.h> (which includes <bits/mathcalls.h>)
- Not yet tracked: global variable index; reported in freetype
- several missing prototypes in various places

In my opinion shadowed variables can result in hard-to-debug problems
so it is my believe that we should keep the warnings for them (and of
course change the variables); I'm interested to know what others think.

In any case I think we should lessen the amount of warnings because
currently it is hard to spot real problems inbetween the huge amount
of harmless ones.

cheers,
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