[llvm-bugs] [Bug 44886] New: Bitfields in class templates cause assertion failures

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Feb 12 10:06:00 PST 2020


https://bugs.llvm.org/show_bug.cgi?id=44886

            Bug ID: 44886
           Summary: Bitfields in class templates cause assertion failures
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: smeenai at fb.com
                CC: elizabeth.andrews at intel.com, hans at chromium.org,
                    llvm-bugs at lists.llvm.org, melanie.blower at intel.com,
                    neeilans at live.com, richard-llvm at metafoo.co.uk
            Blocks: 44555

$ cat reduced.cpp
template <class T> class C {
  enum { K = 1 };
  int i : K;
  unsigned u() { return i; }
};

$ clang -cc1 -fsyntax-only reduced.cpp
clang: /home/smeenai/llvm-project/clang/lib/AST/ExprConstant.cpp:14529: bool
clang::Expr::isIntegerConstantExpr(llvm::APSInt &, const clang::ASTContext &,
clang::SourceLocation *, bool) const: Assertion `!isValueDependent() &&
"Expression evaluator can't be called on a de
pendent expression."' failed.

I bisected this to
https://github.com/llvm/llvm-project/commit/878a24ee244a24c39d1c57e9af2e88c621f7cce9,
so it's a regression from 9 to 10.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=44555
[Bug 44555] [meta] 10.0.0 Release Blockers
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