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Change stripping to use --strip-debug

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When we use -strip-unneeded it removes some symbols that are needed in static
libraries that may be needed in addition to debugging symbols.  Changing the
stripping to the more conservative --strip-debug retains thise symbols.

In the case of libc.a the unstripped file size is 22.4 MB.  Using
--strip-debug reduces the file size by 74 percent to 5.9 MB.

Using --strip-unneeded only reduces the file further by 89 KB,
so any gain is relatively trivial.
This commit is contained in:
Bruce Dubbs 2025-04-15 22:53:28 -05:00
parent d470cdb21c
commit 3d1e81b5a8
1 changed files with 12 additions and 7 deletions
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19
chapter08/stripping.xml
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@ -24,10 +24,15 @@
backup of the LFS system in its current state.</para> backup of the LFS system in its current state.</para>
<para>A <command>strip</command> command with the <para>A <command>strip</command> command with the
<parameter>--strip-unneeded</parameter> option removes all debug symbols <parameter>--strip-unneeded</parameter> option removes all debug symbols from
from a binary or library. It also removes all symbol table entries not a binary or library. It also removes all symbol table entries not normally
needed by the linker (for static libraries) or dynamic linker (for needed by the linker (for static libraries) or dynamic linker (for
dynamically linked binaries and shared libraries).</para> dynamically linked binaries and shared libraries). Using
<parameter>--strip-debug</parameter> does not remove symbol table entries
that may be needed by some applications. The difference between "unneeded"
and "debug" is very small. For example, an unstripped libc.a is 22.4 MB.
After stripping with --strip-debug it is 5.9 MB. Using --strip-unneeded only
reduces the size further to only 5.8 MB.</para>
<!-- TODO: Zstd is better than Zlib for both speed and size. <!-- TODO: Zstd is better than Zlib for both speed and size.
Unfortunately Valgrind does not support Zstd-compressed debug Unfortunately Valgrind does not support Zstd-compressed debug
@ -83,7 +88,7 @@ cd /usr/lib
for LIB in $save_usrlib; do for LIB in $save_usrlib; do
objcopy --only-keep-debug --compress-debug-sections=zlib $LIB $LIB.dbg objcopy --only-keep-debug --compress-debug-sections=zlib $LIB $LIB.dbg
cp $LIB /tmp/$LIB cp $LIB /tmp/$LIB
strip --strip-unneeded /tmp/$LIB strip --strip-debug /tmp/$LIB
objcopy --add-gnu-debuglink=$LIB.dbg /tmp/$LIB objcopy --add-gnu-debuglink=$LIB.dbg /tmp/$LIB
install -vm755 /tmp/$LIB /usr/lib install -vm755 /tmp/$LIB /usr/lib
rm /tmp/$LIB rm /tmp/$LIB
@ -102,14 +107,14 @@ online_usrlib="libbfd-&binutils-version;.so
for BIN in $online_usrbin; do for BIN in $online_usrbin; do
cp /usr/bin/$BIN /tmp/$BIN cp /usr/bin/$BIN /tmp/$BIN
strip --strip-unneeded /tmp/$BIN strip --strip-debug /tmp/$BIN
install -vm755 /tmp/$BIN /usr/bin install -vm755 /tmp/$BIN /usr/bin
rm /tmp/$BIN rm /tmp/$BIN
done done
for LIB in $online_usrlib; do for LIB in $online_usrlib; do
cp /usr/lib/$LIB /tmp/$LIB cp /usr/lib/$LIB /tmp/$LIB
strip --strip-unneeded /tmp/$LIB strip --strip-debug /tmp/$LIB
install -vm755 /tmp/$LIB /usr/lib install -vm755 /tmp/$LIB /usr/lib
rm /tmp/$LIB rm /tmp/$LIB
done done
@ -120,7 +125,7 @@ for i in $(find /usr/lib -type f -name \*.so* ! -name \*dbg) \
case "$online_usrbin $online_usrlib $save_usrlib" in case "$online_usrbin $online_usrlib $save_usrlib" in
*$(basename $i)* ) *$(basename $i)* )
;; ;;
* ) strip --strip-unneeded $i * ) strip --strip-debug $i
;; ;;
esac esac
done done