Strict aliasing and chains revisited

[Sebastian Huber]

I changed the chain control definition to (in CVS head):

typedef union {
  struct {
    Chain_Node Node;
    Chain_Node *fill;
  } Head;

  struct {
    Chain_Node *fill;
    Chain_Node Node;
  } Tail;
} Chain_Control;

This will lead to compile time errors in user code in case of chain API violations.

I also added test cases to

testsuites/sptests/spchain

to ensure that the layout is as expected.

-- 
Sebastian Huber, embedded brains GmbH

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E-Mail  : sebastian.huber at embedded-brains.de
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