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Commit b474fc0a authored by David Srbecky's avatar David Srbecky
Browse files

Remove .rustc ELF section from mini-debug-info. 

The section is stripped from binaries (but preserved in /symbols).

However, is it also unintentionally copied into the minidebuginfo
compressed section, which is included in the final shipped binary.
(This does not affect symtab symbols, which are handled as usual)

Removing it from mini-debug-info shrinks some rust binaries by
up to 10x, saving >10MB on the system partition overall (AOSP).

Test: extract minidebuginfo and check it manually with readelf
Change-Id: I462d81455626bb2b5244e1bf3d5f8b71646f3401
parent f2be52c4

scripts/strip.sh

+1 −1
Original line number Diff line number Diff line
@@ -87,7 +87,7 @@ do_strip_keep_mini_debug_info() { 
        comm -13 "${outfile}.dynsyms" "${outfile}.funcsyms" > "${outfile}.keep_symbols"

        echo >> "${outfile}.keep_symbols" # Ensure that the keep_symbols file is not empty.

        "${CROSS_COMPILE}objcopy" --rename-section .debug_frame=saved_debug_frame "${outfile}.debug" "${outfile}.mini_debuginfo"

        "${CROSS_COMPILE}objcopy" -S --remove-section .gdb_index --remove-section .comment --keep-symbols="${outfile}.keep_symbols" "${outfile}.mini_debuginfo"

        "${CROSS_COMPILE}objcopy" -S --remove-section .gdb_index --remove-section .comment --remove-section .rustc --keep-symbols="${outfile}.keep_symbols" "${outfile}.mini_debuginfo"

        "${CROSS_COMPILE}objcopy" --rename-section saved_debug_frame=.debug_frame "${outfile}.mini_debuginfo"

        "${XZ}" --block-size=64k --threads=0 "${outfile}.mini_debuginfo"