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Elimination of common debug sections

The linker can detect multiple copies of a debug section, and discard the additional copies.

In DWARF 2, the compiler and assembler generate one set of debug sections for each source file that contributes to a compilation unit. armlink can detect multiple copies of a debug section for a particular source file and discard all but one copy in the final image. This can result in a considerable reduction in image debug size.

In DWARF 3, common debug sections are placed in common groups. armlink discards all but one copy of each group with the same signature.

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