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It is a new attribute emitted by clang as a GNU extension and will be part of Dwarf5. The purpose of the attribute is to specify a compile unit level base value for all DW_AT_ranges to reduce the number of relocations have to be done by the linker. Fixes (at least partially): https://llvm.org/pr28826 Differential revision: https://reviews.llvm.org/D24514 llvm-svn: 281595