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|
#! @shell@
set -eu -o pipefail
shopt -s nullglob
path_backup="$PATH"
# phase separation makes this look useless
# shellcheck disable=SC2157
if [ -n "@coreutils_bin@" ]; then
PATH="@coreutils_bin@/bin"
fi
if [ -z "${NIX_CC_WRAPPER_@infixSalt@_FLAGS_SET:-}" ]; then
source @out@/nix-support/add-flags.sh
fi
if [ -n "$NIX_LD_WRAPPER_@infixSalt@_START_HOOK" ]; then
source "$NIX_LD_WRAPPER_@infixSalt@_START_HOOK"
fi
source @out@/nix-support/utils.sh
# Optionally filter out paths not refering to the store.
expandResponseParams "$@"
if [[ "${NIX_ENFORCE_PURITY:-}" = 1 && -n "${NIX_STORE:-}"
&& ( -z "$NIX_@infixSalt@_IGNORE_LD_THROUGH_GCC" || -z "${NIX_@infixSalt@_LDFLAGS_SET:-}" ) ]]; then
rest=()
nParams=${#params[@]}
declare -i n=0
while [ "$n" -lt "$nParams" ]; do
p=${params[n]}
p2=${params[n+1]:-} # handle `p` being last one
if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
skip "${p:2}"
elif [ "$p" = -L ] && badPath "$p2"; then
n+=1; skip "$p2"
elif [ "$p" = -rpath ] && badPath "$p2"; then
n+=1; skip "$p2"
elif [ "$p" = -dynamic-linker ] && badPath "$p2"; then
n+=1; skip "$p2"
elif [ "${p:0:1}" = / ] && badPath "$p"; then
# We cannot skip this; barf.
echo "impure path \`$p' used in link" >&2
exit 1
elif [ "${p:0:9}" = --sysroot ]; then
# Our ld is not built with sysroot support (Can we fix that?)
:
else
rest+=("$p")
fi
n+=1
done
params=("${rest[@]}")
fi
source @out@/nix-support/add-hardening.sh
extraAfter=("${hardeningLDFlags[@]}")
extraBefore=()
if [ -z "${NIX_@infixSalt@_LDFLAGS_SET:-}" ]; then
extraAfter+=($NIX_@infixSalt@_LDFLAGS)
extraBefore+=($NIX_@infixSalt@_LDFLAGS_BEFORE)
fi
extraAfter+=($NIX_@infixSalt@_LDFLAGS_AFTER $NIX_@infixSalt@_LDFLAGS_HARDEN)
declare -a libDirs
declare -A libs
relocatable=
# Find all -L... switches for rpath, and relocatable flags for build id.
if [ "$NIX_@infixSalt@_DONT_SET_RPATH" != 1 ] || [ "$NIX_@infixSalt@_SET_BUILD_ID" = 1 ]; then
prev=
# Old bash thinks empty arrays are undefined, ugh, so temporarily disable
# `set -u`.
set +u
for p in "${extraBefore[@]}" "${params[@]}" "${extraAfter[@]}"; do
set -u
case "$prev" in
-L)
libDirs+=("$p")
;;
-l)
libs["lib${p}.so"]=1
;;
-dynamic-linker | -plugin)
# Ignore this argument, or it will match *.so and be added to rpath.
;;
*)
case "$p" in
-L/*)
libDirs+=("${p:2}")
;;
-l?*)
libs["lib${p:2}.so"]=1
;;
"${NIX_STORE:-}"/*.so | "${NIX_STORE:-}"/*.so.*)
# This is a direct reference to a shared library.
libDirs+=("${p%/*}")
libs["${p##*/}"]=1
;;
-r | --relocatable | -i)
relocatable=1
esac
;;
esac
prev="$p"
done
fi
# Add all used dynamic libraries to the rpath.
if [ "$NIX_@infixSalt@_DONT_SET_RPATH" != 1 ]; then
# For each directory in the library search path (-L...),
# see if it contains a dynamic library used by a -l... flag. If
# so, add the directory to the rpath.
# It's important to add the rpath in the order of -L..., so
# the link time chosen objects will be those of runtime linking.
declare -A rpaths
for dir in "${libDirs[@]}"; do
if [[ "$dir" =~ [/.][/.] ]] && dir2=$(readlink -f "$dir"); then
dir="$dir2"
fi
if [ -n "${rpaths[$dir]:-}" ] || [[ "$dir" != "${NIX_STORE:-}"/* ]]; then
# If the path is not in the store, don't add it to the rpath.
# This typically happens for libraries in /tmp that are later
# copied to $out/lib. If not, we're screwed.
continue
fi
for path in "$dir"/*; do
file="${path##*/}"
if [ "${libs[$file]:-}" ]; then
# This library may have been provided by a previous directory,
# but if that library file is inside an output of the current
# derivation, it can be deleted after this compilation and
# should be found in a later directory, so we add all
# directories that contain any of the libraries to rpath.
rpaths["$dir"]=1
extraAfter+=(-rpath "$dir")
break
fi
done
done
fi
# Only add --build-id if this is a final link. FIXME: should build gcc
# with --enable-linker-build-id instead?
if [ "$NIX_@infixSalt@_SET_BUILD_ID" = 1 ] && [ ! "$relocatable" ]; then
extraAfter+=(--build-id)
fi
# Optionally print debug info.
if [ -n "${NIX_DEBUG:-}" ]; then
set +u # Old bash workaround, see above.
echo "extra flags before to @prog@:" >&2
printf " %q\n" "${extraBefore[@]}" >&2
echo "original flags to @prog@:" >&2
printf " %q\n" "${params[@]}" >&2
echo "extra flags after to @prog@:" >&2
printf " %q\n" "${extraAfter[@]}" >&2
set -u
fi
if [ -n "$NIX_LD_WRAPPER_@infixSalt@_EXEC_HOOK" ]; then
source "$NIX_LD_WRAPPER_@infixSalt@_EXEC_HOOK"
fi
PATH="$path_backup"
set +u # Old bash workaround, see above.
exec @prog@ "${extraBefore[@]}" "${params[@]}" "${extraAfter[@]}"
|