Summary:
The C++ standard allows implementations to choose the underlying type for
bitmask types (e.g. std::ios_base::openmode). MSVC implemented some of them
as signed integers resulting in warnings for usual code like
`auto dd = std::ios_base::badbit | std::ios_base::failbit;`
These false positives were reported in https://bugs.llvm.org/show_bug.cgi?id=34845
The fix allows bitwise |,&,^ for known standard bitmask types under the condition
that both operands are such bitmask types.
Shifting and bitwise complement are still forbidden.
Reviewers: aaron.ballman, alexfh, hokein
Reviewed By: aaron.ballman
Subscribers: xazax.hun
Differential Revision: https://reviews.llvm.org/D39099
llvm-svn: 316767
The bug happened with stream operations, that were not recognized in all cases.
Even there were already existing test for streaming classes, they did not catch this bug.
Adding the isolated example to the existing tests did not trigger the bug.
Therefore i created a new isolated file that did expose the bug indeed.
Differential: https://reviews.llvm.org/D38399
reviewed by aaron.ballman
llvm-svn: 314808
Jonas Toth