[LLVMbugs] [Bug 23247] New: L-values produced by casts to volatile references aren't tracked as volatile

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23247

            Bug ID: 23247
           Summary: L-values produced by casts to volatile references
                    aren't tracked as volatile
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rjmccall at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

static int global = 4;
int main() {
  const_cast<volatile int &>(global) = 4;
}

IRGen marks this store volatile if the cast is a reinterpret_cast, but not if
it's a static_cast, const_cast, or C-style cast.

Storing to the dereferenced result of casting to a volatile pointer type seems
to work in all cases.

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