tree 1db2e008ab573ba1f0bc372e8e868b1abd922c9f
parent 4c2620705b87ab6899fb2756bf191bb89d1995c8
author John McCall <rjmccall@apple.com> 1257497348 +0000
committer John McCall <rjmccall@apple.com> 1257497348 +0000

Improve the -Wsign-compare heuristics:
  * If the unsigned type is smaller than the signed type, never warn, because
    its value will not change when zero-extended to the larger type.
  * If we're testing for (in)equality, and the unsigned value is an integer
    constant whose sign bit is not set, never warn, because even though the
    signed value might change, it can't affect the result of the equality.

Also make the comparison test cases much more rigorous, and have them expose
the subtle differences between C and C++ here.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86242 91177308-0d34-0410-b5e6-96231b3b80d8