50c937439b
we compare the symbols lists of stripped ELF file ($orig.stripped) and that of the one including debugging symbols ($orig.debug) to get a an ELF file which includes only the necessary bits as the debuginfo ($orig.minidebug). but we generate the symbol list of stripped ELF file using the sysv format, while generate the one from the unstripped one using posix format. the former is always padded the symbol names with spaces so that their the length at least the same as the section name after we split the fields with "|". that's why the diff includes the stuff we don't expect. and hence, we have tons of warnings like: ``` objcopy: build/node_exporter/node_exporter.keep_symbols:4910: Ignoring rubbish found on this line ``` when using objcopy to filter the ELF file to keep only the symbols we are interested in. so, in this change * use the same format when dumping the symbols from unstripped ELF file * include the symbols in the text area -- the code, by checking "T" and "t" in the dumped symbols. this was achieved by matching the lines with "FUNC" before this change. * include the the symbols in .init data section -- the global variables which are initialized at compile time. they could be also interesting when debugging an application. Fixes #15513 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#15514
28 lines
1.2 KiB
Bash
Executable File
28 lines
1.2 KiB
Bash
Executable File
#!/bin/bash -e
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set -o pipefail
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orig="$1"
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stripped="$orig.stripped"
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debuginfo="$orig.debug"
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# generate stripped binary and debuginfo
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cp -a "$orig" "$stripped"
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gdb-add-index "$stripped"
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objcopy --merge-notes "$stripped"
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eu-strip --remove-comment -f "$debuginfo" "$stripped"
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# generate minidebug (minisymtab)
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dynsyms="$orig.dynsyms"
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funcsyms="$orig.funcsyms"
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keep_symbols="$orig.keep_symbols"
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mini_debuginfo="$orig.minidebug"
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# silence "Error: Unable to find program interpreter name" warning from readelf, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1012107
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remove_sections=`readelf -W -S "$debuginfo" 2> /dev/null | awk '{ if (index($2,".debug_") != 1 && ($3 == "PROGBITS" || $3 == "NOTE" || $3 == "NOBITS") && index($8,"A") == 0) printf "--remove-section "$2" " }'`
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nm -D "$stripped" --format=posix --defined-only | awk '{ print $1 }' | sort > "$dynsyms"
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nm "$debuginfo" --format=posix --defined-only | awk '{ if ($2 == "T" || $2 == "t" || $2 == "D") print $1 }' | sort > "$funcsyms"
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comm -13 "$dynsyms" "$funcsyms" > "$keep_symbols"
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objcopy -S $remove_sections --keep-symbols="$keep_symbols" "$debuginfo" "$mini_debuginfo"
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xz -f --threads=0 "$mini_debuginfo"
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objcopy --add-section .gnu_debugdata="$mini_debuginfo".xz "$stripped"
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