mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-17 23:36:17 +01:00
ld-wrapper: Optimize expanding rpath
The time to expand rpath was proportional to the number of -L flags times the number of -l flags. Now it is proportional to their sum (assuming constant number of files in each directory in an -L flag). Issue reported by @nh2 at https://github.com/NixOS/nixpkgs/issues/27609#issuecomment-317916623
This commit is contained in:
Orivej Desh
parent
34c0ba498c
commit
4964b104b9
1 changed files with 83 additions and 106 deletions
|
|
@ -1,4 +1,5 @@
|
|||
#! @shell@ -e
|
||||
shopt -s nullglob
|
||||
path_backup="$PATH"
|
||||
if [ -n "@coreutils_bin@" ]; then
|
||||
PATH="@coreutils_bin@/bin"
|
||||
|
|
@ -20,18 +21,19 @@ expandResponseParams "$@"
|
|||
if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" \
|
||||
-a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \) ]; then
|
||||
rest=()
|
||||
n=0
|
||||
while [ $n -lt ${#params[*]} ]; do
|
||||
nParams=${#params[@]}
|
||||
declare -i n=0
|
||||
while [ $n -lt $nParams ]; do
|
||||
p=${params[n]}
|
||||
p2=${params[$((n+1))]}
|
||||
if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
|
||||
skip $p
|
||||
skip "${p:2}"
|
||||
elif [ "$p" = -L ] && badPath "$p2"; then
|
||||
n=$((n + 1)); skip $p2
|
||||
n+=1; skip "$p2"
|
||||
elif [ "$p" = -rpath ] && badPath "$p2"; then
|
||||
n=$((n + 1)); skip $p2
|
||||
n+=1; skip "$p2"
|
||||
elif [ "$p" = -dynamic-linker ] && badPath "$p2"; then
|
||||
n=$((n + 1)); skip $p2
|
||||
n+=1; skip "$p2"
|
||||
elif [ "${p:0:1}" = / ] && badPath "$p"; then
|
||||
# We cannot skip this; barf.
|
||||
echo "impure path \`$p' used in link" >&2
|
||||
|
|
@ -40,9 +42,9 @@ if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" \
|
|||
# Our ld is not built with sysroot support (Can we fix that?)
|
||||
:
|
||||
else
|
||||
rest=("${rest[@]}" "$p")
|
||||
rest+=("$p")
|
||||
fi
|
||||
n=$((n + 1))
|
||||
n+=1
|
||||
done
|
||||
params=("${rest[@]}")
|
||||
fi
|
||||
|
|
@ -50,7 +52,7 @@ fi
|
|||
LD=@prog@
|
||||
source @out@/nix-support/add-hardening.sh
|
||||
|
||||
extra=(${hardeningLDFlags[@]})
|
||||
extra=("${hardeningLDFlags[@]}")
|
||||
extraBefore=()
|
||||
|
||||
if [ -z "$NIX_LDFLAGS_SET" ]; then
|
||||
|
|
@ -60,122 +62,97 @@ fi
|
|||
|
||||
extra+=($NIX_LDFLAGS_AFTER $NIX_LDFLAGS_HARDEN)
|
||||
|
||||
declare -A rpaths
|
||||
declare -a libDirs
|
||||
declare -A libs
|
||||
relocatable=
|
||||
|
||||
# Find all -L... switches for rpath, and relocatable flags for build id.
|
||||
if [ "$NIX_DONT_SET_RPATH" != 1 ] || [ "$NIX_SET_BUILD_ID" = 1 ]; then
|
||||
prev=
|
||||
for p in "${params[@]}" "${extra[@]}"; do
|
||||
case "$prev" in
|
||||
-L)
|
||||
libDirs+=("$p")
|
||||
;;
|
||||
-l)
|
||||
libs["lib${p}.so"]=1
|
||||
;;
|
||||
-dynamic-linker)
|
||||
# Ignore the dynamic linker 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 | "$NIX_STORE"/*.so.*)
|
||||
# This is a direct reference to a shared library, so add
|
||||
# its directory to the rpath.
|
||||
dir="${p%/*}"
|
||||
if [ ! "${rpaths[$dir]}" ]; then
|
||||
rpaths["$dir"]=1
|
||||
extra+=(-rpath "$dir")
|
||||
fi
|
||||
;;
|
||||
-r | --relocatable | -i)
|
||||
relocatable=1
|
||||
esac
|
||||
;;
|
||||
esac
|
||||
prev="$p"
|
||||
done
|
||||
fi
|
||||
|
||||
|
||||
# Add all used dynamic libraries to the rpath.
|
||||
if [ "$NIX_DONT_SET_RPATH" != 1 ]; then
|
||||
|
||||
declare -A libDirsSeen
|
||||
declare -a libDirs
|
||||
|
||||
addToLibPath() {
|
||||
local path="$1"
|
||||
if [ "${path:0:1}" != / ]; then return 0; fi
|
||||
case "$path" in
|
||||
*..*|*./*|*/.*|*//*)
|
||||
local path2
|
||||
if path2=$(readlink -f "$path"); then
|
||||
path="$path2"
|
||||
fi
|
||||
;;
|
||||
esac
|
||||
if [[ -z ${libDirsSeen[$path]} ]]; then
|
||||
libDirs+=("$path")
|
||||
libDirsSeen[$path]=1
|
||||
fi
|
||||
}
|
||||
|
||||
declare -A rpathsSeen
|
||||
declare -a rpaths
|
||||
|
||||
addToRPath() {
|
||||
# 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 $out/lib. If not, we're screwed.
|
||||
if [ "${1:0:${#NIX_STORE}}" != "$NIX_STORE" ]; then return 0; fi
|
||||
if [[ -z ${rpathsSeen[$1]} ]]; then
|
||||
rpaths+=("$1")
|
||||
rpathsSeen[$1]=1
|
||||
fi
|
||||
}
|
||||
|
||||
declare -a libs
|
||||
|
||||
# First, find all -L... switches.
|
||||
allParams=("${params[@]}" ${extra[@]})
|
||||
n=0
|
||||
while [ $n -lt ${#allParams[*]} ]; do
|
||||
p=${allParams[n]}
|
||||
p2=${allParams[$((n+1))]}
|
||||
if [ "${p:0:3}" = -L/ ]; then
|
||||
addToLibPath ${p:2}
|
||||
elif [ "$p" = -L ]; then
|
||||
addToLibPath ${p2}
|
||||
n=$((n + 1))
|
||||
elif [ "$p" = -l ]; then
|
||||
libs+=(${p2})
|
||||
n=$((n + 1))
|
||||
elif [ "${p:0:2}" = -l ]; then
|
||||
libs+=(${p:2})
|
||||
elif [ "$p" = -dynamic-linker ]; then
|
||||
# Ignore the dynamic linker argument, or it
|
||||
# will get into the next 'elif'. We don't want
|
||||
# the dynamic linker path rpath to go always first.
|
||||
n=$((n + 1))
|
||||
elif [[ "$p" =~ ^[^-].*\.so($|\.) ]]; then
|
||||
# This is a direct reference to a shared library, so add
|
||||
# its directory to the rpath.
|
||||
path="$(dirname "$p")";
|
||||
addToRPath "${path}"
|
||||
fi
|
||||
n=$((n + 1))
|
||||
done
|
||||
|
||||
# Second, for each directory in the library search path (-L...),
|
||||
# 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.
|
||||
for i in ${libDirs[@]}; do
|
||||
for j in ${libs[@]}; do
|
||||
if [ -f "$i/lib$j.so" ]; then
|
||||
addToRPath $i
|
||||
break
|
||||
for dir in "${libDirs[@]}"; do
|
||||
if [[ "$dir" =~ [/.][/.] ]] && dir2=$(readlink -f "$dir"); then
|
||||
dir="$dir2"
|
||||
fi
|
||||
if [ "${rpaths[$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"/lib*.so; do
|
||||
file="${path##*/}"
|
||||
if [ "${libs[$file]}" ]; then
|
||||
libs["$file"]=
|
||||
if [ ! "${rpaths[$dir]}" ]; then
|
||||
rpaths["$dir"]=1
|
||||
extra+=(-rpath "$dir")
|
||||
fi
|
||||
fi
|
||||
done
|
||||
done
|
||||
|
||||
# Finally, add `-rpath' switches.
|
||||
for i in ${rpaths[@]}; do
|
||||
extra+=(-rpath "$i")
|
||||
done
|
||||
fi
|
||||
|
||||
|
||||
# Only add --build-id if this is a final link. FIXME: should build gcc
|
||||
# with --enable-linker-build-id instead?
|
||||
if [ "$NIX_SET_BUILD_ID" = 1 ]; then
|
||||
for p in "${params[@]}"; do
|
||||
if [ "$p" = "-r" -o "$p" = "--relocatable" -o "$p" = "-i" ]; then
|
||||
relocatable=1
|
||||
break
|
||||
fi
|
||||
done
|
||||
if [ -z "$relocatable" ]; then
|
||||
extra+=(--build-id)
|
||||
fi
|
||||
if [ "$NIX_SET_BUILD_ID" = 1 ] && [ ! "$relocatable" ]; then
|
||||
extra+=(--build-id)
|
||||
fi
|
||||
|
||||
|
||||
# Optionally print debug info.
|
||||
if [ -n "$NIX_DEBUG" ]; then
|
||||
echo "original flags to @prog@:" >&2
|
||||
for i in "${params[@]}"; do
|
||||
echo " $i" >&2
|
||||
done
|
||||
echo "extra flags to @prog@:" >&2
|
||||
for i in ${extra[@]}; do
|
||||
echo " $i" >&2
|
||||
done
|
||||
echo "original flags to @prog@:" >&2
|
||||
printf " %q\n" "${params[@]}" >&2
|
||||
echo "extra flags to @prog@:" >&2
|
||||
printf " %q\n" "${extraBefore[@]}" "${extra[@]}" >&2
|
||||
fi
|
||||
|
||||
if [ -n "$NIX_LD_WRAPPER_EXEC_HOOK" ]; then
|
||||
|
|
@ -183,4 +160,4 @@ if [ -n "$NIX_LD_WRAPPER_EXEC_HOOK" ]; then
|
|||
fi
|
||||
|
||||
PATH="$path_backup"
|
||||
exec @prog@ ${extraBefore[@]} "${params[@]}" ${extra[@]}
|
||||
exec @prog@ "${extraBefore[@]}" "${params[@]}" "${extra[@]}"
|
||||
|
|
|
|||
Loading…
Reference in a new issue