222 lines
7.2 KiB
Bash
222 lines
7.2 KiB
Bash
#! @shell@
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set -eu -o pipefail +o posix
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shopt -s nullglob
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if (( "${NIX_DEBUG:-0}" >= 7 )); then
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set -x
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fi
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path_backup="$PATH"
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# phase separation makes this look useless
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# shellcheck disable=SC2157
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if [ -n "@coreutils_bin@" ]; then
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PATH="@coreutils_bin@/bin"
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fi
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source @out@/nix-support/utils.bash
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if [ -z "${NIX_BINTOOLS_WRAPPER_FLAGS_SET_@suffixSalt@:-}" ]; then
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source @out@/nix-support/add-flags.sh
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fi
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setDynamicLinker=1
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# Optionally filter out paths not refering to the store.
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expandResponseParams "$@"
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if [[ "${NIX_ENFORCE_PURITY:-}" = 1 && -n "${NIX_STORE:-}"
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&& ( -z "$NIX_IGNORE_LD_THROUGH_GCC_@suffixSalt@" || -z "${NIX_LDFLAGS_SET_@suffixSalt@:-}" ) ]]; then
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rest=()
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nParams=${#params[@]}
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declare -i n=0
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while (( "$n" < "$nParams" )); do
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p=${params[n]}
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p2=${params[n+1]:-} # handle `p` being last one
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if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
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skip "${p:2}"
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elif [ "$p" = -L ] && badPath "$p2"; then
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n+=1; skip "$p2"
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elif [ "$p" = -rpath ] && badPath "$p2"; then
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n+=1; skip "$p2"
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elif [ "$p" = -dynamic-linker ] && badPath "$p2"; then
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n+=1; skip "$p2"
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elif [ "${p:0:1}" = / ] && badPath "$p"; then
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# We cannot skip this; barf.
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echo "impure path \`$p' used in link" >&2
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exit 1
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elif [ "${p:0:9}" = --sysroot ]; then
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# Our ld is not built with sysroot support (Can we fix that?)
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:
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else
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if [[ "$p" = -static || "$p" = -static-pie ]]; then
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# Using a dynamic linker for static binaries can lead to crashes.
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# This was observed for rust binaries.
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setDynamicLinker=0
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fi
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rest+=("$p")
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fi
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n+=1
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done
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# Old bash empty array hack
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params=(${rest+"${rest[@]}"})
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fi
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source @out@/nix-support/add-hardening.sh
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extraAfter=()
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extraBefore=(${hardeningLDFlags[@]+"${hardeningLDFlags[@]}"})
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if [ -z "${NIX_LDFLAGS_SET_@suffixSalt@:-}" ]; then
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extraAfter+=($NIX_LDFLAGS_@suffixSalt@)
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extraBefore+=($NIX_LDFLAGS_BEFORE_@suffixSalt@)
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# By adding dynamic linker to extraBefore we allow the users set their
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# own dynamic linker as NIX_LD_FLAGS will override earlier set flags
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if [[ "$setDynamicLinker" = 1 && -n "$NIX_DYNAMIC_LINKER_@suffixSalt@" ]]; then
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extraBefore+=("-dynamic-linker" "$NIX_DYNAMIC_LINKER_@suffixSalt@")
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fi
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fi
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extraAfter+=($NIX_LDFLAGS_AFTER_@suffixSalt@)
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# Specify the target emulation if nothing is passed in ("-m" overrides this
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# environment variable). Ensures we never blindly fallback on targeting the host
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# platform.
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: ${LDEMULATION:=@emulation@}
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# Three tasks:
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#
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# 1. Find all -L... switches for rpath
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#
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# 2. Find relocatable flag for build id.
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#
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# 3. Choose 32-bit dynamic linker if needed
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declare -a libDirs
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declare -A libs
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declare -i relocatable=0 link32=0
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if
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[ "$NIX_DONT_SET_RPATH_@suffixSalt@" != 1 ] \
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|| [ "$NIX_SET_BUILD_ID_@suffixSalt@" = 1 ] \
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|| [ -e @out@/nix-support/dynamic-linker-m32 ]
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then
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prev=
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# Old bash thinks empty arrays are undefined, ugh.
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for p in \
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${extraBefore+"${extraBefore[@]}"} \
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${params+"${params[@]}"} \
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${extraAfter+"${extraAfter[@]}"}
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do
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case "$prev" in
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-L)
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libDirs+=("$p")
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;;
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-l)
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libs["lib${p}.so"]=1
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;;
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-m)
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# Presumably only the last `-m` flag has any effect.
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case "$p" in
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elf_i386) link32=1;;
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*) link32=0;;
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esac
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;;
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-dynamic-linker | -plugin)
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# Ignore this argument, or it will match *.so and be added to rpath.
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;;
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*)
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case "$p" in
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-L/*)
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libDirs+=("${p:2}")
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;;
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-l?*)
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libs["lib${p:2}.so"]=1
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;;
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"${NIX_STORE:-}"/*.so | "${NIX_STORE:-}"/*.so.*)
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# This is a direct reference to a shared library.
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libDirs+=("${p%/*}")
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libs["${p##*/}"]=1
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;;
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-r | --relocatable | -i)
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relocatable=1
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esac
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;;
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esac
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prev="$p"
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done
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fi
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if [[ "$link32" = "1" && "$setDynamicLinker" = 1 && -e "@out@/nix-support/dynamic-linker-m32" ]]; then
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# We have an alternate 32-bit linker and we're producing a 32-bit ELF, let's
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# use it.
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extraAfter+=(
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'-dynamic-linker'
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"$(< @out@/nix-support/dynamic-linker-m32)"
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)
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fi
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# Add all used dynamic libraries to the rpath.
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if [ "$NIX_DONT_SET_RPATH_@suffixSalt@" != 1 ]; then
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# For each directory in the library search path (-L...),
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# see if it contains a dynamic library used by a -l... flag. If
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# so, add the directory to the rpath.
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# It's important to add the rpath in the order of -L..., so
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# the link time chosen objects will be those of runtime linking.
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declare -A rpaths
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for dir in ${libDirs+"${libDirs[@]}"}; do
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if [[ "$dir" =~ [/.][/.] ]] && dir2=$(readlink -f "$dir"); then
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dir="$dir2"
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fi
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if [ -n "${rpaths[$dir]:-}" ] || [[ "$dir" != "${NIX_STORE:-}"/* ]]; then
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# If the path is not in the store, don't add it to the rpath.
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# This typically happens for libraries in /tmp that are later
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# copied to $out/lib. If not, we're screwed.
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continue
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fi
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for path in "$dir"/*; do
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file="${path##*/}"
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if [ "${libs[$file]:-}" ]; then
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# This library may have been provided by a previous directory,
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# but if that library file is inside an output of the current
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# derivation, it can be deleted after this compilation and
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# should be found in a later directory, so we add all
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# directories that contain any of the libraries to rpath.
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rpaths["$dir"]=1
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extraAfter+=(-rpath "$dir")
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break
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fi
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done
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done
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fi
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# This is outside the DONT_SET_RPATH branch because it's more targeted and we
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# usually want it (on Darwin) even if DONT_SET_RPATH is set.
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if [ -n "${NIX_COREFOUNDATION_RPATH:-}" ]; then
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extraAfter+=(-rpath $NIX_COREFOUNDATION_RPATH)
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fi
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# Only add --build-id if this is a final link. FIXME: should build gcc
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# with --enable-linker-build-id instead?
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if [ "$NIX_SET_BUILD_ID_@suffixSalt@" = 1 ] && ! (( "$relocatable" )); then
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extraAfter+=(--build-id)
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fi
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# Optionally print debug info.
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if (( "${NIX_DEBUG:-0}" >= 1 )); then
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# Old bash workaround, see above.
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echo "extra flags before to @prog@:" >&2
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printf " %q\n" ${extraBefore+"${extraBefore[@]}"} >&2
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echo "original flags to @prog@:" >&2
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printf " %q\n" ${params+"${params[@]}"} >&2
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echo "extra flags after to @prog@:" >&2
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printf " %q\n" ${extraAfter+"${extraAfter[@]}"} >&2
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fi
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PATH="$path_backup"
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# Old bash workaround, see above.
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exec @prog@ \
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${extraBefore+"${extraBefore[@]}"} \
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${params+"${params[@]}"} \
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${extraAfter+"${extraAfter[@]}"}
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