[LLVMbugs] [Bug 3248] New: Operand of sizeof(vla) not evaluated

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Dec 20 21:29:56 PST 2008


           Summary: Operand of sizeof(vla) not evaluated
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu

int a(int x) {int a, (*y)[x]; return sizeof(*(puts("asdf"),y));}

The emitted IL should have a call to puts, but the call isn't emitted in clang.

Per C99, "If the type of the operand [of a sizeof] is a variable
length array type, the operand is evaluated; otherwise, the operand is not
evaluated and the result is an integer constant."

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