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-rw-r--r--config/libc.in14
-rw-r--r--scripts/build/internals.sh13
-rwxr-xr-xscripts/xldd.in214
3 files changed, 241 insertions, 0 deletions
diff --git a/config/libc.in b/config/libc.in
index 2ee46ba..5397f23 100644
--- a/config/libc.in
+++ b/config/libc.in
@@ -81,6 +81,20 @@ config THREADS_NONE
endchoice
+config LIBC_XLDD
+ bool
+ prompt "Install a cross ldd-like helper"
+ default y
+ help
+ Say 'Y' here if you want to have a ldd-like helper that
+ you can run on your build system, and that will (try to)
+ resolve shared libraries dependencies as if run on the
+ target.
+
+ Note that the cross-ldd helper is not a full replacement
+ for the native ldd. Please see the help, by running it
+ with '--help' for more explanations.
+
source "config.gen/libc.in.2"
endif # ! LIBC_none
diff --git a/scripts/build/internals.sh b/scripts/build/internals.sh
index 84c8798..3e5ee5d 100644
--- a/scripts/build/internals.sh
+++ b/scripts/build/internals.sh
@@ -21,6 +21,19 @@ do_finish() {
CT_DoExecLog ALL chmod 755 "${CT_PREFIX_DIR}/bin/${CT_TARGET}-populate"
fi
+ if [ "${CT_LIBC_XLDD}" = "y" ]; then
+ CT_DoLog EXTRA "Installing a cross-ldd helper"
+ sed -r -e 's|@@CT_TARGET@@|'"${CT_TARGET}"'|g;' \
+ -e 's|@@CT_install@@|'"${install}"'|g;' \
+ -e 's|@@CT_bash@@|'"${bash}"'|g;' \
+ -e 's|@@CT_grep@@|'"${grep}"'|g;' \
+ -e 's|@@CT_make@@|'"${make}"'|g;' \
+ -e 's|@@CT_sed@@|'"${sed}"'|g;' \
+ "${CT_LIB_DIR}/scripts/xldd.in" \
+ >"${CT_PREFIX_DIR}/bin/${CT_TARGET}-ldd"
+ CT_DoExecLog ALL chmod 755 "${CT_PREFIX_DIR}/bin/${CT_TARGET}-ldd"
+ fi
+
# Create the aliases to the target tools
CT_DoLog EXTRA "Creating toolchain aliases"
CT_Pushd "${CT_PREFIX_DIR}/bin"
diff --git a/scripts/xldd.in b/scripts/xldd.in
new file mode 100755
index 0000000..9a28294
--- /dev/null
+++ b/scripts/xldd.in
@@ -0,0 +1,214 @@
+#!@@CT_bash@@
+
+# NON-CONFIGURABLE STUFF!
+export LC_ALL=C
+sed="@@CT_sed@@"
+grep="@@CT_grep@@"
+my_name="$( basename "${0}" )"
+prefix="${0%-ldd}"
+gcc="${prefix}-gcc"
+readelf="${prefix}-readelf"
+fake_load_addr="$((0xdeadbeef))"
+fake_load_addr_sys="$((0x8badf00d))"
+ld_library_path="/lib:/usr/lib"
+
+do_error() {
+ printf "%s: %s\n" "${my_name}" "$*" >&2
+}
+
+do_opt_error() {
+ do_error "$@"
+ printf "Try \`%s --help' for more information\n >&2"
+}
+
+show_version() {
+ # Fake a real ldd, just in case some dumb script would check
+ cat <<_EOF_
+ldd (crosstool-NG) 1.8.0
+Copyright (C) 2010 "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
+This is free software; see the source for copying conditions. There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+Licensed under the GPLv2, see the file LICENSES in the top-directory of the
+sources for this package.
+_EOF_
+}
+
+show_help() {
+ cat <<_EOF_
+Usage: ${my_name} [OPTION]... --root DIR FILE...
+ --help print this help and exit
+ --version print version information and exit
+ --root dir treat dir as being the root of the target
+ -s, --show-system mark libs from the sysroot with a trailing '[*]'
+
+_EOF_
+ cat <<_EOF_ |fmt
+${my_name} tries to mimick the behavior of a real native ldd, but can be
+used in a cross-development environment. Here is how it differs from a
+real native ldd:
+
+The LD_LIBRARY_PATH variable is not used, as it can not reliably be
+guessed except at runtime, and we can't run.
+
+${my_name} does not scan /etc/ld.so.cache, but instead uses /etc/ld.so.conf
+(it understands the include directives therein for libces that have that).
+[Note: this is missing for now...]
+
+${my_name} will search the directory specified with --root for libraries
+to resolve the NEEDED tags. If --root is not set, then ${my_name} will
+use the value in the environment variable \${CT_XLDD_ROOT}. If neither
+is set, then this is an error.
+
+If NEEDED libraries can't be found in the specified root directory, then
+${my_name} will also look in the sysroot of the toolchain to see if it
+can find them.
+
+For NEEDED libraries that were found, the output will look like:
+ libneeded.so => /path/to/libneeded.so (0xloadaddr)
+
+and for those that were not found, the output will look like:
+ libneeded.so not found
+
+The paths are relative to the specified root directory, or to the sysroot
+(eg. /lib/libneeded.so, /usr/lib/libneeded.so, and so on...).
+
+The expected load address 'loadaddr' is a faked address to match the output
+of the real ldd, but has no actual meaning (set to some constants for now,
+0x8badf00d for libraries from the sysroot, 0xdeadbeff for others).
+_EOF_
+
+# Unimplemeted yet:
+# -d, --data-relocs process data relocations
+# -r, --function-relocs process data and function relocations
+# -u, --unused print unused direct dependencies
+# -v, --verbose print all information
+
+# See also this thread:
+# http://sourceware.org/ml/crossgcc/2008-09/msg00057.html
+}
+
+# Parse command line options
+root="${CT_XLDD_ROOT}"
+show_system=
+while true; do
+ case "${1}" in
+ --help)
+ show_help
+ exit 0
+ ;;
+ --version)
+ show_version
+ exit 0
+ ;;
+ --root)
+ root="$2"
+ shift
+ ;;
+ --root=*)
+ root="${1#--root=}"
+ ;;
+ --show-system|-s)
+ show_system=1
+ ;;
+ -*)
+ do_opt_error "unrecognized option \`${1}'"
+ exit 1
+ ;;
+ *)
+ break
+ ;;
+ esac
+ shift
+done
+
+# Sanity checks
+if [ -z "${root}" ]; then
+ do_opt_error "no root given"
+ exit 1
+fi
+if [ ! -d "${root}" ]; then
+ do_error "\`${root}': no such file or directory"
+ exit 1
+fi
+
+sysroot="$( "${gcc}" -print-sysroot )"
+
+do_report_needed_found() {
+ local needed="${1}"
+ local path="${2}"
+ local system="${3}"
+ local loadaddr
+ local sys
+
+ if [ -z "${system}" ]; then
+ loadaddr="${fake_load_addr}"
+ else
+ loadaddr="${fake_load_addr_sys}"
+ if [ -n "${show_system}" ]; then
+ sys=" [*]"
+ fi
+ fi
+
+ # 8 to fake a 32-bit load address
+ printf "%8s%s => %s (0x%0*x)%s\n" \
+ "" \
+ "${needed}" \
+ "${path}" \
+ 8 \
+ "${loadaddr}" \
+ "${sys}"
+}
+
+# Search a needed file, scanning ${lib_dir} in the root directory
+do_find_needed() {
+ local needed="${1}"
+ local found
+ local found_sysroot
+ local d
+
+ for d in "${needed_search_path[@]}"; do
+ if [ -f "${root}${d}/${needed}" ]; then
+ found="${d}/${needed}"
+ fi
+ done
+ if [ -z "${found}" ]; then
+ for d in "${needed_search_path[@]}"; do
+ if [ -f "${sysroot}${d}/${needed}" ]; then
+ found_sysroot="${d}/${needed}"
+ fi
+ done
+ fi
+
+ if [ -n "${found}" ]; then
+ do_report_needed_found "${needed}" "${found}"
+ do_process_file "${root}${found}"
+ elif [ -n "${found_sysroot}" ]; then
+ do_report_needed_found "${needed}" "${found_sysroot}" "sys"
+ do_process_file "${sysroot}${found_sysroot}"
+ else
+ printf "%8c%s not found\n" "" "${needed}"
+ fi
+}
+
+# Scan a file for all NEEDED tags
+do_process_file() {
+ local file="${1}"
+
+ "${readelf}" -d "${file}" \
+ |"${grep}" -E '\(NEEDED\)' \
+ |"${sed}" -r -e 's/^.*Shared library:[[:space:]]+\[(.*)\]$/\1/;' \
+ |while read needed; do
+ do_find_needed "${needed}"
+ done
+}
+
+# Build up the full list of search directories
+declare -a needed_search_path
+ld_library_path="${ld_library_path}:"
+while [ -n "${ld_library_path}" ]; do
+ d="${ld_library_path%%:*}"
+ [ -n "${d}" ] && needed_search_path+=( "${d}" )
+ ld_library_path="${ld_library_path#*:}"
+done
+
+do_process_file "${1}"