[LLVMbugs] [Bug 11149] New: kernel compiling: size of array is negative

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11149

           Summary: kernel compiling: size of array is negative
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: xuzhongxing at gmail.com
                CC: llvmbugs at cs.uiuc.edu


When compiling Linux kernel 3.0, gcc accepts this code at -O2 level. But clang
rejects it. Gcc also rejects it at -O0.

void f(int offset) {
  ((void)sizeof(char[1 - 2*!!(!__builtin_constant_p(offset))]));
}

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