[LLVMbugs] [Bug 3047] New: llvmc2 $ENV(...) segfaults when the environment variable is missing

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3047

           Summary: llvmc2 $ENV(...) segfaults when the environment variable
                    is missing
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pcwalton at cs.ucla.edu
                CC: llvmbugs at cs.uiuc.edu


When the environment variable in question is missing, the generated code for
llvmc2 tries to create a std::string from a NULL pointer, which causes a
segfault. The attached patch fixes this problem.


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