diff options
| author | bdrewery <bdrewery@FreeBSD.org> | 2016-01-19 22:42:16 +0000 |
|---|---|---|
| committer | bdrewery <bdrewery@FreeBSD.org> | 2016-01-19 22:42:16 +0000 |
| commit | 3bda4bd41de2eb4d2c9880b4b393ca4261d0d7e5 (patch) | |
| tree | 135e8cfd1d5a95525f4cf89641cd1c328e41eb91 /tools | |
| parent | e7715d79c632b98e3509010271599ff6c1c786de (diff) | |
| download | FreeBSD-src-3bda4bd41de2eb4d2c9880b4b393ca4261d0d7e5.zip FreeBSD-src-3bda4bd41de2eb4d2c9880b4b393ca4261d0d7e5.tar.gz | |
Allow specifying an alternative LD_LIBRARY_PATH for the ldd(1) lookup.
This is needed to be able to run check-links.sh against a "sysrooted"
binary while ensuring that the ldd(1) call done on the host uses the
host libc. It is not possible to set LD_LIBRARY_PATH before calling
check-links.sh as then the "sysrooted" libc would be incorrectly used.
A LD_PRELOAD=libc.so is used to ldd(1) as it needs to use the host libc
to run. ldd(1) is a simple wrapper around execve(2) and dlopen(2) with
env LD_TRACE_LOADED_OBJECTS set. Due to the dlopen(2) restriction on
shared library tracing ldd(1) is still required for this lookup.
Sponsored by: EMC / Isilon Storage Division
Diffstat (limited to 'tools')
| -rwxr-xr-x | tools/build/check-links.sh | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/tools/build/check-links.sh b/tools/build/check-links.sh index 937f61c..06aa8d3 100755 --- a/tools/build/check-links.sh +++ b/tools/build/check-links.sh @@ -20,7 +20,8 @@ libkey() { usage() { cat <<-EOF - usage: $0 [-Uv] file + usage: $0 [-Uv] [-L LD_LIBRARY_PATH] file + -L: Specify an alternative LD_LIBRARY_PATH for the library resolution. -U: Skip looking for unresolved symbols. -v: Show which library each symbol is resolved to. EOF @@ -30,8 +31,9 @@ usage() { ret=0 CHECK_UNRESOLVED=1 VERBOSE_RESOLVED=0 -while getopts "Uv" flag; do +while getopts "L:Uv" flag; do case "${flag}" in + L) LIB_PATH="${OPTARG}" ;; U) CHECK_UNRESOLVED=0 ;; v) VERBOSE_RESOLVED=1 ;; *) usage ;; @@ -55,7 +57,14 @@ esac # Gather all symbols from the target unresolved_symbols=$(nm -u -D --format=posix "$1" | awk '$2 == "U" {print $1}' | tr '\n' ' ') [ ${isbin} -eq 1 ] && bss_symbols=$(nm -D --format=posix "$1" | awk '$2 == "B" && $4 != "" {print $1}' | tr '\n' ' ') -ldd_libs=$(ldd $(realpath $1) | awk '{print $1 ":" $3}') +if [ -n "${LIB_PATH}" ]; then + for libc in /lib/libc.so.*; do + LDD_ENV="LD_PRELOAD=${libc}" + done + LDD_ENV="${LDD_ENV} LD_LIBRARY_PATH=${LIB_PATH}" +fi + +ldd_libs=$(env ${LDD_ENV} ldd $(realpath $1) | awk '{print $1 ":" $3}') # Check for useful libs list_libs= |
