8e2d77f734
This commit fixes wrap-find-debuginfo.sh so that: * the .gnu_debuglink section of libc.so.6 is retained, and * the redundant debuginfo file generated for ld.so is removed Co-Authored-By: Benjamin Herrenschmidt <benh@amazon.com> Reviewed-by: Florian Weimer <fweimer@redhat.com>
140 lines
3.8 KiB
Bash
140 lines
3.8 KiB
Bash
#!/bin/bash
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# Wrapper script for find-debuginfo.sh
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#
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# Usage:
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# wrap-find-debuginfo.sh SYSROOT-PATH SCRIPT-PATH SCRIPT-ARGS...
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#
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# The wrapper saves the original version of ld.so found in SYSROOT-PATH,
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# invokes SCRIPT-PATH with SCRIPT-ARGS, and then restores the
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# LDSO-PATH file, followed by note merging and DWZ compression.
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# As a result, ld.so has (mostly) unchanged debuginfo even
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# after debuginfo extraction.
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#
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# For libc.so.6, a set of strategic symbols is preserved in .symtab
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# that are frequently used in valgrind suppressions and elsewhere.
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set -ex
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ldso_tmp="$(mktemp)"
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libc_tmp="$(mktemp)"
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libc_dlink_tmp="$(mktemp)"
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# Prefer a separately installed debugedit over the RPM-integrated one.
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if command -v debugedit >/dev/null ; then
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debugedit=debugedit
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else
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debugedit=/usr/lib/rpm/debugedit
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fi
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cleanup () {
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rm -f "$ldso_tmp" "$libc_tmp" "$libc_dlink_tmp"
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}
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trap cleanup 0
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sysroot_path="$1"
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shift
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script_path="$1"
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shift
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# See ldso_path setting in glibc.spec.
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ldso_path=
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for ldso_candidate in `find "$sysroot_path" -regextype posix-extended \
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-regex '.*/ld(-.*|64|)\.so\.[0-9]+$' -type f` ; do
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if test -z "$ldso_path" ; then
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ldso_path="$ldso_candidate"
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else
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echo "error: multiple ld.so candidates: $ldso_path, $ldso_candidate"
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exit 1
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fi
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done
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# libc.so.6 always uses this name, so it is simpler to locate.
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libc_path=
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for libc_candidate in `find "$sysroot_path" -name libc.so.6`; do
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if test -z "$libc_path" ; then
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libc_path="$libc_candidate"
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else
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echo "error: multiple libc.so.6 candidates: $libc_path, $libc_candidate"
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exit 1
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fi
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done
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# Preserve the original files.
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cp "$ldso_path" "$ldso_tmp"
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cp "$libc_path" "$libc_tmp"
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# Run the debuginfo extraction.
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"$script_path" "$@"
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# libc.so.6: Extract the .gnu_debuglink section
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objcopy -j.gnu_debuglink --set-section-flags .gnu_debuglink=alloc \
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-O binary "$libc_path" "$libc_dlink_tmp"
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# Restore the original files.
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cp "$ldso_tmp" "$ldso_path"
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cp "$libc_tmp" "$libc_path"
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# Reduce the size of notes. Primarily for annobin.
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objcopy --merge-notes "$ldso_path"
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objcopy --merge-notes "$libc_path"
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# libc.so.6: Restore the .gnu_debuglink section
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objcopy --add-section .gnu_debuglink="$libc_dlink_tmp" "$libc_path"
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# ld.so does not have separated debuginfo and so the debuginfo file
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# generated by find-debuginfo is redundant. Therefore, remove it.
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ldso_debug=
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for ldso_debug_candidate in `find "$sysroot_path" -regextype posix-extended \
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-regex '.*/ld(-.*|64|)\.so\.[0-9]+.*debug$' -type f` ; do
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if test -z "$ldso_debug" ; then
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ldso_debug="$ldso_debug_candidate"
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else
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echo "error: multiple ld.so debug candidates: $ldso_debug, $ldso_debug_candidate"
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exit 1
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fi
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done
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rm -f "$ldso_debug"
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# libc.so.6: Reduce to valuable symbols. Eliminate file symbols,
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# annobin symbols, and symbols used by the glibc build to implement
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# hidden aliases (__EI_*). We would also like to remove __GI_*
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# symbols, but even listing them explicitly (as in -K __GI_strlen)
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# still causes strip to remove them, so there is no filtering of
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# __GI_* here. (Debuginfo is gone after this, so no need to optimize
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# it.)
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strip -w \
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-K '*' \
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-K '!*.c' \
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-K '!*.os' \
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-K '!.annobin_*' \
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-K '!__EI_*' \
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-K '!__PRETTY_FUNCTION__*' \
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"$libc_path"
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# ld.so: Rewrite the source file paths to match the extracted
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# locations. First compute the arguments for invoking debugedit.
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# See find-debuginfo.sh.
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debug_dest_name="/usr/src/debug"
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last_arg=
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while true ; do
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arg="$1"
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shift || break
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case "$arg" in
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(--unique-debug-src-base)
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debug_dest_name="/usr/src/debug/$1"
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shift
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;;
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(-*)
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;;
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(*)
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last_arg="$arg"
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;;
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esac
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done
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debug_base_name=${last_arg:-$RPM_BUILD_ROOT}
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$debugedit -b "$debug_base_name" -d "$debug_dest_name" -n $ldso_path
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# Apply single-file DWARF optimization.
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dwz $ldso_path
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