Roman Lebedev
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309b7f5d77
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[Sema] Put tautological comparison of unsigned and zero into it's own flag
Summary:
As requested by Sam McCall.
```
$ /build/llvm-build-Clang-release/./bin/clang -c /build/clang/test/Sema/outof-range-constant-compare.c /build/clang/test/Sema/outof-range-constant-compare.c:40:11: warning: comparison of unsigned expression < 0 is always false [-Wtautological-unsigned-zero-compare]
if (a < 0x0000000000000000UL) // expected-warning {{comparison of unsigned expression < 0 is always false}}
~ ^ ~~~~~~~~~~~~~~~~~~~~
```
Reviewers: sammccall, bkramer, djasper, rsmith, rjmccall, aaron.ballman
Reviewed By: sammccall, aaron.ballman
Subscribers: aaron.ballman, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D37620
llvm-svn: 312792
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2017-09-08 13:56:45 +00:00 |