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Usage: llvm-objcopy --compress-debug-sections=zlib foo.o llvm-objcopy --compress-debug-sections=zlib-gnu foo.o In both cases the debug section contents is compressed with zlib. In the GNU style case the header is the "ZLIB" magic string followed by the uint64 big- endian decompressed size. In the non-GNU mode the header is the Elf(32|64)_Chdr. Decompression support is coming soon. Differential Revision: https://reviews.llvm.org/D49678 llvm-svn: 341342