mangler fails with gcc-4.3.x and gcc-4.1.2 on sparc; suggest disabling -fvia-C

The Evil Mangler does not grok the output of gcc-4.3.x on Sparc systems (Linux or Solaris). Results look like:

[1 of 1] Compiling Main             ( Main.hs, Main.o )
/tmp/ghc19196_0/ghc19196_0.hc: In function ‘rhT_entry’:

/tmp/ghc19196_0/ghc19196_0.hc:38:0:
     note: if this code is reached, the program will abort

And that which it prophesies does come to pass

$ ./Main 
Illegal instruction

I don't suggest anyone actually fix the Evil Mangler. Instead we could just disable -fvia-C (registerised). Have sparc be the first arch to make the switch! Alternatively, if we're feeling generous, only enable support for registerised -fvia-C if ./configure detects gcc version 4.2 or less.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Driver
Test case
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