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Hi all,

    Currently GDB is not able to debug (Binary generated with Clang) variables
    present in shared/private clause of OpenMP Task construct. Please note that
    LLVM debugger LLDB is able to debug.
    # make check RUNTESTFLAGS='CC_FOR_TARGET="clang" ' TESTS="gdb.threads/omp-task.exp"

    In case of OpenMP, compilers generate artificial functions which are not
    present in actual program. This is done to apply parallelism to block of
    code.

    For non-artifical functions, DW_AT_name attribute should contains the name
    exactly as present in actual program.
    (Ref# http://wiki.dwarfstd.org/index.php?title=Best_Practices)
    Since artificial functions are not present in actual program they not having
    DW_AT_name and having DW_AT_linkage_name instead should be fine. This
    Is what Clang chooses to do.

    Currently GDB is invalidating any function not havnig DW_AT_name that is why
    it is not able to debug OpenMP (Clang).

    It should be fair to fallback to check DW_AT_linkage_name in case DW_AT_name
    is absent. The current patch applies this and enables GDB to debug Clang generated
    binaries correctly.

    Please review the patch and let me know your thoughts.

Regards,
Alok