mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-29 09:08:52 +00:00
288ac9d627
xldd uses sed and grep as detected by ./configure. This works well if is
used on the machine that build the toolchain.
But if the user moves the toolchain to another machine where sed and grep
are not in the same directory (eg. /bin/sed vs. /usr/bin/sed), then xldd
will stop functionning.
Fix that by using ${SED} and ${GREP} if they are set in the environment.
Reported-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
353 lines
10 KiB
Plaintext
Executable File
353 lines
10 KiB
Plaintext
Executable File
#!@@CT_bash@@
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# NON-CONFIGURABLE STUFF!
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export LC_ALL=C
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version="@@CT_VERSION@@"
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bits="@@CT_BITS@@"
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sed="${SED:-@@CT_sed@@}"
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grep="${GREP:-@@CT_grep@@}"
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my_name="$( basename "${0}" )"
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prefix="${0%-ldd}"
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gcc="${prefix}-gcc"
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readelf="${prefix}-readelf"
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fake_load_addr_root="$((0xdeadbeef))"
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fake_load_addr_rpath="$((0xdeadc0de))"
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fake_load_addr_sysroot="$((0x8badf00d))"
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ld_library_path="/lib:/usr/lib"
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do_error() {
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printf "%s: %s\n" "${my_name}" "$*" >&2
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}
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do_opt_error() {
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do_error "$@"
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printf "Try \`%s --help' for more information\n" "${my_name}" >&2
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}
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do_trace() {
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local depth=0
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[ -z "${CT_XLDD_VERBOSE}" ] && return 0
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for((depth=0; "${#FUNCNAME[$((depth+1))]}" != 0; depth++)); do :; done
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printf "%*s" $((4*(depth-1))) "" >&2
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printf -- "$@" >&2
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}
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show_version() {
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# Fake a real ldd, just in case some dumb script would check
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cat <<_EOF_
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ldd (crosstool-NG) ${version}
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Copyright (C) 2010 "Yann E. MORIN" <yann.morin.1998@free.fr>
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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Licensed under the GPLv2, see the file LICENSES in the top-directory of the
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sources for this package.
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_EOF_
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}
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show_help() {
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cat <<_EOF_
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Usage: ${my_name} [OPTION]... --root DIR FILE...
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--help print this help and exit
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--version print version information and exit
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--root dir treat dir as being the root of the target
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-s, --show-system mark libs from the sysroot with a trailing '[*]'
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and libs found via RPATH with a trailing '[+]'
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_EOF_
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cat <<_EOF_ |fmt
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${my_name} tries to mimick the behavior of a real native ldd, but can be
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used in a cross-development environment. Here is how it differs from a
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real native ldd:
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If the CT_XLDD_VERBOSE variable is set and non-empty, then ${my_name} will
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print a lot of debug messages, explaining how it builds the library
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search path, and how each library was found and why.
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The LD_LIBRARY_PATH variable is not used, as it can not reliably be
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guessed except at runtime, and we can't run.
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${my_name} does not scan /etc/ld.so.cache, but instead uses /etc/ld.so.conf
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(it understands the include directives therein for libces that have that).
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${my_name} also interprets (tries to!) the RPATH/RUNPATH records found in
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the dynamic ELF section. Such paths are searched for only relative to
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the specified root, not from the sysroot (see below). Also, those paths
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are searched for not only for the file they appear in, but also for its
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dependencies.
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${my_name} will search the directory specified with --root for libraries
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to resolve the NEEDED tags. If --root is not set, then ${my_name} will
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use the value in the environment variable \${CT_XLDD_ROOT}. If neither
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is set, then this is an error.
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If NEEDED libraries can't be found in the specified root directory, then
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${my_name} will also look in the sysroot of the toolchain to see if it
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can find them.
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For NEEDED libraries that were found, the output will look like:
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libneeded.so => /path/to/libneeded.so (0xloadaddr)
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and for those that were not found, the output will look like:
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libneeded.so not found
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The paths are relative to the specified root directory, or to the sysroot
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(eg. /lib/libneeded.so, /usr/lib/libneeded.so, and so on...).
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The expected load address 'loadaddr' is a faked address to match the output
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of the real ldd, but has no actual meaning (set to some constants for now,
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0x8badf00d for libraries from the sysroot, 0xdeadc0de for those found via
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the RPATH/RUNPATH records, and 0xdeadbeef for others).
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_EOF_
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# Unimplemeted yet:
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# -d, --data-relocs process data relocations
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# -r, --function-relocs process data and function relocations
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# -u, --unused print unused direct dependencies
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# -v, --verbose print all information
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# See also this thread:
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# http://sourceware.org/ml/crossgcc/2008-09/msg00057.html
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}
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# Parse command line options
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root="${CT_XLDD_ROOT}"
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show_system=
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while true; do
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case "${1}" in
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--help)
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show_help
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exit 0
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;;
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--version)
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show_version
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exit 0
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;;
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--root)
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root="$2"
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shift
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;;
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--root=*)
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root="${1#--root=}"
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;;
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--show-system|-s)
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show_system=1
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;;
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-*)
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do_opt_error "unrecognized option \`${1}'"
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exit 1
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;;
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*)
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break
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;;
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esac
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shift
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done
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# Sanity checks
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if [ -z "${root}" ]; then
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do_opt_error "no root given"
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exit 1
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fi
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if [ ! -d "${root}" ]; then
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do_error "\`${root}': no such file or directory"
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exit 1
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fi
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sysroot="$( "${gcc}" -print-sysroot 2>/dev/null )"
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if [ -z "${sysroot}" ]; then
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sysroot="$( "${gcc}" -print-file-name=libc.so 2>/dev/null \
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|sed -r -e 's:/usr/lib/libc.so$::;' \
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)"
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fi
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if [ -z "${sysroot}" ]; then
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do_error "unable to find sysroot for \`${gcc}'"
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fi
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do_report_needed_found() {
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local needed="${1}"
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local path="${2}"
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local origin="${3}"
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local loadaddr
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local sys
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case "${origin}" in
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root)
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loadaddr="${fake_load_addr_root}"
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;;
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rpath)
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loadaddr="${fake_load_addr_rpath}"
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if [ -n "${show_system}" ]; then
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sys=" [+]"
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fi
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;;
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sysroot)
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loadaddr="${fake_load_addr_sysroot}"
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if [ -n "${show_system}" ]; then
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sys=" [*]"
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fi
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;;
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esac
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printf "%8s%s => %s (0x%0*x)%s\n" \
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"" \
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"${needed}" \
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"${path}" \
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"$((bits/4))" \
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"${loadaddr}" \
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"${sys}"
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}
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# Search a needed file, scanning ${lib_dir} in the root directory
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do_find_needed() {
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local needed="${1}"
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local -a list
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local -a dirs
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local found
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local where
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local base
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local d i
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do_trace "Searching for '%s'\n" "${needed}"
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# rpath shall come first!
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list=( \
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"rpath:${root}" \
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"root:${root}" \
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"sysroot:${sysroot}" \
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)
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for i in "${list[@]}"; do
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where="${i%%:*}"
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base="${i#*:}"
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if [ "${where}" = "rpath" ]; then
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dirs=( "${search_rpath[@]}" )
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else
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dirs=( "${needed_search_path[@]}" )
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fi
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for d in "${dirs[@]}"; do
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do_trace "-> looking in '%s' (%s)\n" "${d}" "${where}"
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if [ -f "${base}${d}/${needed}" ]; then
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found="${d}/${needed}"
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do_trace "---> found\n"
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break 2
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fi
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done
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done
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if [ -n "${found}" ]; then
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do_report_needed_found "${needed}" "${found}" "${where}"
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do_process_file "${base}${found}"
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else
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printf "%8s%s not found\n" "" "${needed}"
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fi
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do_trace "Done searching for '%s'\n" "${needed}"
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}
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# Scan a file for all NEEDED tags
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do_process_file() {
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local file="${1}"
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local -a save_search_rpath
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local n m
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local found
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do_trace "Parsing file '%s'\n" "${file}"
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save_search_rpath=( "${search_rpath[@]}" )
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for n in $( "${readelf}" -d "${file}" \
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|"${grep}" -E '\((RPATH|RUNPATH)\)' \
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|"${sed}" -r -e 's/^.*Library r(|un)path:[[:space:]]+\[(.*)\]$/\2/;'\
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); do
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do_trace "-> adding rpath '%s'\n" "${n}"
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search_rpath+=( "${n}" )
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done
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do_trace ": search path:\n"
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for n in "${search_rpath[@]}" "${needed_search_path[@]}"; do
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do_trace ": - '%s'\n" "${n}"
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done
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do_trace ": end search path\n"
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for n in $( "${readelf}" -d "${file}" \
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|"${grep}" -E '\(NEEDED\)' \
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|"${sed}" -r -e 's/^.*Shared library:[[:space:]]+\[([^]]+)\].*/\1/;' \
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); do
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found=0
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for m in "${needed_list[@]}"; do
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[ "${n}" = "${m}" ] && found=1 && break
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done
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if [ ${found} -ne 0 ]; then
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do_trace "-> skipping already known dependency '%s'\n" "${n}"
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continue
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fi
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do_trace "-> handling new dependency '%s'\n" "${n}"
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needed_list+=( "${n}" )
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do_find_needed "${n}"
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do_trace "-> done handling dependency '%s'\n" "${n}"
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done
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search_rpath=( "${save_search_rpath[@]}" )
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do_trace "Finished parsing file '%s'\n" "${file}"
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}
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# Recursively scan a /etc/ld.so.conf file
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do_scan_etc_ldsoconf() {
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local ldsoconf="${1}"
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local g
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local f
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[ -f "${ldsoconf}" ] || return 0
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do_trace "Parsing ld.so.conf: '%s'\n" "${ldsoconf}"
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while read line; do
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case "${line}" in
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include\ *)
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g="${root}${line#include }"
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do_trace "-> handling include directive '%s'\n" "${g}"
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for f in ${g}; do
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do_scan_etc_ldsoconf "${f}"
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done
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do_trace "-> finished handling include directive '%s'\n" "${g}"
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;;
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\#*|"")
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;;
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*)
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do_trace "-> adding search dir '%s'\n" "${line}"
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needed_search_path+=( "${line}" )
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;;
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esac
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done <"${ldsoconf}"
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do_trace "Finished parsing ld.so.conf: '%s'\n" "${ldsoconf}"
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}
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# Build up the full list of search directories
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declare -a needed_search_path
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do_trace "Adding basic lib dirs\n"
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ld_library_path="${ld_library_path}:"
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while [ -n "${ld_library_path}" ]; do
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d="${ld_library_path%%:*}"
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if [ -n "${d}" ]; then
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do_trace "-> adding search dir '%s'\n" "${d}"
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needed_search_path+=( "${d}" )
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fi
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ld_library_path="${ld_library_path#*:}"
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done
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do_trace "Done adding basic lib dirs\n"
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do_trace "Scanning '/etc/ld.so.conf'\n"
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do_scan_etc_ldsoconf "${root}/etc/ld.so.conf"
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do_trace "Done scanning '/etc/ld.so.conf'\n"
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do_trace "Search path:\n"
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for p in "${needed_search_path[@]}"; do
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do_trace "-> '%s'\n" "${p}"
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done
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declare -a needed_list
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declare -a search_rpath
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do_trace "Scanning file '%s'\n" "${1}"
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do_process_file "${1}"
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do_trace "Done scanning file '%s'\n" "${1}"
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