[LLVMbugs] [Bug 12533] New: Debug info corresponding to extern variable is not generated in clang

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12533

             Bug #: 12533
           Summary: Debug info corresponding to extern variable is not
                    generated in clang
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: karthikthecool at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8374
  --> http://llvm.org/bugs/attachment.cgi?id=8374
IR and assembly file generated for above code

Debug info corresponding to extern variable is not generated in clang. For e.g.
in the code below-

extern int externalVar;
int globalVar;

int fun()
{
    int ret = 0;
    externalVar = 0;
    globalVar =1;
    ret = externalVar + globalVar;

    return ret;
}

Gcc generates debug info corresponding to externalVar as -

    .long    .LASF0    # DW_AT_name: "externalVar"
    .byte    0x1    # DW_AT_decl_file
(/home/karthik.b/P4_workspace/SISO_PROFILE_BADA_SLP_KARTHIK/SHP_TASK/SWP1/OSP/OSP3.0_LLVM/llvm_src/projects/clang-tests/gcc-testsuite/src/g++.dg/debug/dwarf2/redeclaration-1.C)
    .byte    0x15    # DW_AT_decl_line
    .long    0x5a    # DW_AT_type
    .byte    0x1    # DW_AT_external
    .byte    0x1    # DW_AT_declaration


This info is not generated in case of clang. 
IR Generated also doesn't contain debug info corresponding to externalVar.

Please find attached the IR and assembly file for the above code for LLVM and
assembly file generated in case of gcc which has externalVar debug info.

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