#2968: add test for C trigraphs
-----------------------------+----------------------------------------------
Reporter: duncan | Owner:
Type: task | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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{{{
main = print "??)"
}}}
If we compile the above `-fvia-C` then some gcc versions report:
{{{
/tmp/ghc6084_0/ghc6084_0.hc:99:30:
warning: trigraph ??) ignored, use -trigraphs to enable
}}}
This should make us nervous.
According to the GCC manual if we were ever to use `-std=c89` or any of
the official C standard compliance modes (ie non-GNU) then we would get
standard C (cpp) trigraph behavior.
We should therefore add a codeGen/should_run test to make sure that the
above program does always print `"??)"` and never `"]"`. This test only
needs to be run for the `-fvia-C` 'ways', optc etc.
It's not an immediate priority but it may trip someone up in future when
porting or if we make unregisterised C code more standards compliant and
start using one of the official `-std=` modes. It is unlikely to hit us
but if it ever did it'd be a real pain to debug.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2968>
GHC <http://www.haskell.org/ghc/>
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