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nixpkgs/pkgs/build-support/bintools-wrapper/ld-wrapper.sh
Moritz Angermann 14996789a1
Check link type based on expanded parameters
So far we've ignored response files in arguments, and did not
check linkType against expanded parameters.  This means if
we have `-static` in a @reponse-file, linkType will not be
set to `-static` as we never check against the expanded arguments
from response files.
2022-01-01 20:30:56 +08:00

261 lines
8.2 KiB
Bash

#! @shell@
set -eu -o pipefail +o posix
shopt -s nullglob
if (( "${NIX_DEBUG:-0}" >= 7 )); then
set -x
fi
path_backup="$PATH"
# phase separation makes this look useless
# shellcheck disable=SC2157
if [ -n "@coreutils_bin@" ]; then
PATH="@coreutils_bin@/bin"
fi
source @out@/nix-support/utils.bash
if [ -z "${NIX_BINTOOLS_WRAPPER_FLAGS_SET_@suffixSalt@:-}" ]; then
source @out@/nix-support/add-flags.sh
fi
# Optionally filter out paths not refering to the store.
expandResponseParams "$@"
# NIX_LINK_TYPE is set if ld has been called through our cc wrapper. We take
# advantage of this to avoid both recalculating it, and also repeating other
# processing cc wrapper has already done.
if [[ -n "${NIX_LINK_TYPE_@suffixSalt@:-}" ]]; then
linkType=$NIX_LINK_TYPE_@suffixSalt@
else
linkType=$(checkLinkType "${params[@]}")
fi
if [[ "${NIX_ENFORCE_PURITY:-}" = 1 && -n "${NIX_STORE:-}"
&& ( -z "$NIX_IGNORE_LD_THROUGH_GCC_@suffixSalt@" || -z "${NIX_LINK_TYPE_@suffixSalt@:-}" ) ]]; then
rest=()
nParams=${#params[@]}
declare -i n=0
while (( "$n" < "$nParams" )); do
p=${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
# Old bash empty array hack
params=(${rest+"${rest[@]}"})
fi
source @out@/nix-support/add-hardening.sh
extraAfter=()
extraBefore=(${hardeningLDFlags[@]+"${hardeningLDFlags[@]}"})
if [ -z "${NIX_LINK_TYPE_@suffixSalt@:-}" ]; then
extraAfter+=($(filterRpathFlags "$linkType" $NIX_LDFLAGS_@suffixSalt@))
extraBefore+=($(filterRpathFlags "$linkType" $NIX_LDFLAGS_BEFORE_@suffixSalt@))
# By adding dynamic linker to extraBefore we allow the users set their
# own dynamic linker as NIX_LD_FLAGS will override earlier set flags
if [[ "$linkType" == dynamic && -n "$NIX_DYNAMIC_LINKER_@suffixSalt@" ]]; then
extraBefore+=("-dynamic-linker" "$NIX_DYNAMIC_LINKER_@suffixSalt@")
fi
fi
extraAfter+=($(filterRpathFlags "$linkType" $NIX_LDFLAGS_AFTER_@suffixSalt@))
# These flags *must not* be pulled up to -Wl, flags, so they can't go in
# add-flags.sh. They must always be set, so must not be disabled by
# NIX_LDFLAGS_SET.
if [ -e @out@/nix-support/add-local-ldflags-before.sh ]; then
source @out@/nix-support/add-local-ldflags-before.sh
fi
# Specify the target emulation if nothing is passed in ("-m" overrides this
# environment variable). Ensures we never blindly fallback on targeting the host
# platform.
: ${LDEMULATION:=@emulation@}
# Three tasks:
#
# 1. Find all -L... switches for rpath
#
# 2. Find relocatable flag for build id.
#
# 3. Choose 32-bit dynamic linker if needed
declare -a libDirs
declare -A libs
declare -i relocatable=0 link32=0
linkerOutput="a.out"
if
[ "$NIX_DONT_SET_RPATH_@suffixSalt@" != 1 ] \
|| [ "$NIX_SET_BUILD_ID_@suffixSalt@" = 1 ] \
|| [ -e @out@/nix-support/dynamic-linker-m32 ]
then
prev=
# Old bash thinks empty arrays are undefined, ugh.
for p in \
${extraBefore+"${extraBefore[@]}"} \
${params+"${params[@]}"} \
${extraAfter+"${extraAfter[@]}"}
do
case "$prev" in
-L)
libDirs+=("$p")
;;
-l)
libs["lib${p}.so"]=1
;;
-m)
# Presumably only the last `-m` flag has any effect.
case "$p" in
elf_i386) link32=1;;
*) link32=0;;
esac
;;
-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
# Determine linkerOutput
prev=
for p in \
${extraBefore+"${extraBefore[@]}"} \
${params+"${params[@]}"} \
${extraAfter+"${extraAfter[@]}"}
do
case "$prev" in
-o)
# Informational for post-link-hook
linkerOutput="$p"
;;
*)
;;
esac
prev="$p"
done
if [[ "$link32" == "1" && "$linkType" == dynamic && -e "@out@/nix-support/dynamic-linker-m32" ]]; then
# We have an alternate 32-bit linker and we're producing a 32-bit ELF, let's
# use it.
extraAfter+=(
'-dynamic-linker'
"$(< @out@/nix-support/dynamic-linker-m32)"
)
fi
# Add all used dynamic libraries to the rpath.
if [[ "$NIX_DONT_SET_RPATH_@suffixSalt@" != 1 && "$linkType" != static-pie ]]; 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 ${libDirs+"${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 "$dir")
break
fi
done
done
fi
# This is outside the DONT_SET_RPATH branch because it's more targeted and we
# usually want it (on Darwin) even if DONT_SET_RPATH is set.
if [ -n "${NIX_COREFOUNDATION_RPATH:-}" ]; then
extraAfter+=(-rpath $NIX_COREFOUNDATION_RPATH)
fi
# Only add --build-id if this is a final link. FIXME: should build gcc
# with --enable-linker-build-id instead?
if [ "$NIX_SET_BUILD_ID_@suffixSalt@" = 1 ] && ! (( "$relocatable" )); then
extraAfter+=(--build-id)
fi
# Optionally print debug info.
if (( "${NIX_DEBUG:-0}" >= 1 )); then
# Old bash workaround, see above.
echo "extra flags before to @prog@:" >&2
printf " %q\n" ${extraBefore+"${extraBefore[@]}"} >&2
echo "original flags to @prog@:" >&2
printf " %q\n" ${params+"${params[@]}"} >&2
echo "extra flags after to @prog@:" >&2
printf " %q\n" ${extraAfter+"${extraAfter[@]}"} >&2
fi
PATH="$path_backup"
# Old bash workaround, see above.
@prog@ \
${extraBefore+"${extraBefore[@]}"} \
${params+"${params[@]}"} \
${extraAfter+"${extraAfter[@]}"}
if [ -e "@out@/nix-support/post-link-hook" ]; then
source @out@/nix-support/post-link-hook
fi