scripts/_gdb_compress_debug.sh

   1 # From gdb info
   2
   3 # Extract the dynamic symbols from the main binary, there is no need
   4 # to also have these in the normal symbol table.
   5 nm -D $1 --format=posix --defined-only \
   6   | awk '{ print $1 }' | sort > dynsyms
   7
   8 # Extract all the text (i.e. function) symbols from the debuginfo.
   9 # (Note that we actually also accept "D" symbols, for the benefit
  10 # of platforms like PowerPC64 that use function descriptors.)
  11 nm $1 --format=posix --defined-only \
  12   | awk '{ if ($2 == "T" || $2 == "t" || $2 == "D") print $1 }' \
  13   | sort > funcsyms
  14
  15 # Keep all the function symbols not already in the dynamic symbol
  16 # table.
  17 comm -13 dynsyms funcsyms > keep_symbols
  18
  19 # Separate full debug info into debug binary.
  20 objcopy --only-keep-debug $1 debug
  21
  22 # Copy the full debuginfo, keeping only a minimal set of symbols and
  23 # removing some unnecessary sections.
  24 objcopy -S --remove-section .gdb_index --remove-section .comment \
  25   --keep-symbols=keep_symbols debug mini_debuginfo
  26
  27 # Drop the full debug info from the original binary.
  28 strip --strip-all -R .comment $1
  29
  30 # Inject the compressed data into the .gnu_debugdata section of the
  31 # original binary.
  32 xz -c mini_debuginfo > mini_debuginfo.xz
  33 objcopy --add-section .gnu_debugdata=mini_debuginfo.xz $1