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@@ -10,7 +10,8 @@
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<title>Stripping Again</title>
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- <para>If the intended user is not a programmer and does not plan to do
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+ <para>This section is optional. If the intended user is not a
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+ programmer and does not plan to do
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any debugging on the system software, the system size can be decreased
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by about 90 MB by removing the debugging symbols from binaries and
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libraries. This causes no inconvenience other than not being able to
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@@ -22,20 +23,38 @@
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<command>strip</command> command, it is a good idea to make a
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backup of the LFS system in its current state.</para>
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- <para>First back up some libraries whose debug symbols are needed when
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- running regression tests in BLFS packages:</para>
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+ <para>First place the debugging sysmbols for selected libraries
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+ in separate files. This debugging information is needed if running
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+ regression tests that use <ulink
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+ url='&blfs-book;/general/prog/valgrind.html'>valgrind</ulink> or <ulink
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+ url='&blfs-book;/general/prog/gdb.html'>gdb</ulink> later in BLFS.
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+ </para>
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<!-- also of interest are libgfortan, libgo, libgomp, and libobjc from gcc -->
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-<screen><userinput>save_libs="ld- libatomic libc- libcilkrts libitm libmpx libpthread"
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-save_libs="$save_libs libquadmath libsanitizer libstdc++ libthread_db libvtv"
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-mkdir -p /var/dbg/lib /var/dbg/usr/lib
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+<screen><userinput>save_lib="ld-2.25.so libc-2.25.so libpthread-2.25.so libthread_db-1.0.so"
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-for lib in $save_libs
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-do
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- find /usr/lib -name ${lib}*so* -type f -exec cp {} /var/dbg/usr/lib \;
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- find /lib -name ${lib}*so* -type f -exec cp {} /var/dbg/lib \;
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-done</userinput></screen>
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+cd /lib
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+
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+for LIB in $save_lib; do
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+ objcopy --only-keep-debug $LIB $LIB.dbg
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+ strip --strip-unneeded $LIB
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+ objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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+done
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+
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+save_usrlib="libquadmath.o.0.0.0 libstdc++.so.6.0.22
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+ libmpx.so.2.0.0 libmpxwrappers.so.2.0.0 libitm.so.1.0.0
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+ libcilkrts.so.5.0.0 libatomic.so.1.2.0"
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+
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+cd /usr/lib
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+
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+for LIB in $save_usrlib; do
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+ objcopy --only-keep-debug $LIB $LIB.dbg
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+ strip --strip-unneeded $LIB
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+ objcopy --add-gnu-debuglink=$LIB.dbg $LIB
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+done
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+
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+unset LIB save_lib save_usrlib</userinput></screen>
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<para>Before performing the stripping, take special care to ensure that
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none of the binaries that are about to be stripped are running. If
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@@ -57,7 +76,7 @@ done</userinput></screen>
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<screen><userinput>/tools/bin/find /usr/lib -type f -name \*.a \
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-exec /tools/bin/strip --strip-debug {} ';'
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-/tools/bin/find /lib /usr/lib -type f -name \*.so* \
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+/tools/bin/find /lib /usr/lib -type f \(-name \*.so* -a ! -name \*dbg\) \
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-exec /tools/bin/strip --strip-unneeded {} ';'
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/tools/bin/find /{bin,sbin} /usr/{bin,sbin,libexec} -type f \
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@@ -68,13 +87,4 @@ done</userinput></screen>
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warnings indicate that those files are scripts instead of
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binaries.</para>
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- <para>If desired, restore the saved libraries with the debug data
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- intact. The files can restored now or just held for later use. Note
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- that several of the files cannot be copied directly after rebooting
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- to the new LFS system. Later use requires booting to another system,
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- mounting the LFS partition, and then copying the files.</para>
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-
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-<screen><userinput>cp -av /var/dbg/lib/* /lib
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-cp -av /var/dbg/usr/lib/* /usr/lib</userinput></screen>
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-
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</sect1>
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Bruce Dubbs