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Author SHA1 Message Date
Richard Smith 5011a0022a Some builtins do not evaluate their arguments. Teach EvaluatedExprVisitor not 
to visit them.

llvm-svn: 172769
 2013-01-17 23:46:04 +00:00
Richard Smith 01a7fba820 -Wunsequenced: if the LHS of an &&, || or ?: is not constant, check for 
unsequenced operations in the RHS. We don't compare the RHS with the rest of
the expression yet; such checks will need care to avoid diagnosing unsequenced
operations which are both in conditionally-evaluated subexpressions which
actually can't occur together, such as in '(b && ++x) + (!b && ++x)'.

llvm-svn: 172760
 2013-01-17 22:06:26 +00:00
Richard Smith c406cb7364 Add -Wunsequenced (with compatibility alias -Wsequence-point) to warn on 
expressions which have undefined behavior due to multiple unsequenced
modifications or an unsequenced modification and use of a variable.

llvm-svn: 172690
 2013-01-17 01:17:56 +00:00